\r\n\tThis book aims to explore the issues around the rheology of polymers, with an emphasis on biopolymers as well as the modification of polymers using reactive extrusion.
",isbn:null,printIsbn:"979-953-307-X-X",pdfIsbn:null,doi:null,price:0,priceEur:0,priceUsd:0,slug:null,numberOfPages:0,isOpenForSubmission:!1,hash:"5bc21841d2b87388ad498bc09910944b",bookSignature:"Dr. Casparus Johannes Verbeek and Dr. Velram Mohan",publishedDate:null,coverURL:"https://cdn.intechopen.com/books/images_new/8880.jpg",keywords:"Extrusion, Injection Moulding, Thermoplastics, Natural Polymers, Biomass, Polymer Modification, Polymer Blends, Compatibilization, Processing Challenges, Reactive Compounding, Screw Design, Process Design",numberOfDownloads:null,numberOfWosCitations:0,numberOfCrossrefCitations:0,numberOfDimensionsCitations:0,numberOfTotalCitations:0,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"September 6th 2019",dateEndSecondStepPublish:"September 27th 2019",dateEndThirdStepPublish:"November 26th 2019",dateEndFourthStepPublish:"February 14th 2020",dateEndFifthStepPublish:"April 14th 2020",remainingDaysToSecondStep:"a year",secondStepPassed:!0,currentStepOfPublishingProcess:5,editedByType:null,kuFlag:!1,biosketch:null,coeditorOneBiosketch:null,coeditorTwoBiosketch:null,coeditorThreeBiosketch:null,coeditorFourBiosketch:null,coeditorFiveBiosketch:null,editors:[{id:"102391",title:"Dr.",name:"Casparus",middleName:"Johannes",surname:"Verbeek",slug:"casparus-verbeek",fullName:"Casparus Verbeek",profilePictureURL:"https://mts.intechopen.com/storage/users/102391/images/system/102391.jpeg",biography:"Dr Verbeek is a Chemical Engineer, currently an associate professor at the School of Engineering at the University of Waikato and is also the R&D manager for Aduro Biopolymers. 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1. Introduction
LAB have a long history in preserving foods from spoilage microorganisms - they are commonly used in food fermentation, may produce several metabolites with beneficial health effects and, thus, are generally recognized as safe (GRAS). The increasing resistance of food spoilage microorganisms to current preservatives, the consumer’s high demand for safe, minimally processed foods and the hazards associated with the use of high doses of chemical preservatives has led to the need for finding safer alternatives in food preservation. The application of LAB with the simultaneous control of factors that affect fungal growth can help to minimize food spoilage. The selection and addition of novel isolates of LAB may be the key to reducing the use of chemicals, enhancing nutrients and extend the shelf life of bakery products. In this chapter, the focus will be on the use of LAB as biopreservative agents to extend the shelf life of bakery products and the inhibition of the common spoilage fungi of bread.
2. Sources of LAB
LAB are found in many habitats and occur naturally in a variety of food products, such as dairy, vegetables and meat products (Carr et al., 2002), all of which are rich in the nutrients required for the fastidious metabolism of LAB (Björkroth & Holzapfel, 2003; Hammes & Hertel, 2003). Some LAB are associated with the mouth flora, intestine and vagina of mammals (Whittenbury, 1964), while others are present in fermented seafood, such as Lactobacillus plantarum (IFRPD P15) and L. reuteri (IFRPD P17), which are reported to be associated with plaa-som fermented Thai fish (Saithong et al., 2010). LAB are the most important bacteria used in the fermentation industry of dairy products, such as yogurt, cheese, sour milk and butter, and in combination with yeast are commonly used to ferment cereal products such as dough (Lavermicocca et al., 2000; Muhialdin et al., 2011a; Ryan et al., 2008).
3. Spoilage fungi in food
The economic losses and the health hazards of the mycotoxins produced by spoilage fungi are the main concerns of the food industry (Gray & Bemiller, 2003). According to Gerez et al., (2009) the spoilage of bakery products by fungi is more common in countries with a high humidity and temperature. Pitt and Hocking (1999) estimated that about 5-10% of food production is spoiled by the growth of yeast and fungi in food materials. Similarly, in Western Europe, the growth of the spoilage fungi of bread is estimated to reach more than 200 million Euros per year (Legan, 1993; Schnürer & Magnusson, 2005). The history conditions of the food can be a major factor in determining any fungal spoilage - for example, stored and processed foods are more sensitive to spoilage when compared with fresh and prepared foods. Aspergillus and Penicillium species are the most common spoilage fungi for many foods and feeds while Fusarium species are reported to attack the cereal grains in the field (Samson et al., 2000).
The most widespread species of fungi that contaminate bakery products belong to the genera Aspergillus, Penicillium, Eurotium (Abellana et al., 1997; Guynot et al., 2005), Monilia, Mucor, Endomyces, Cladosporium, Fusarium and Rhizopus (Lavermicocca et al., 2000, 2003). In addition, fungi may be responsible for off-flavours, the production of mycotoxins and allergenic compounds. There are more than 400 known mycotoxins produced by different fungi (Filtenborg et al., 1996). Mycotoxigenic fungi such as Aspergillus, Fusarium and Penicillium are serious hazards for human health. The six classes of mycotoxins frequently encountered in different food systems are: aflatoxins, fumonisins, ochratoxins, patulin, trichothecenes and zearalenone (Dalié et al., 2009).
4. Common techniques to control spoilage fungi in bakery products
Two types of techniques/factors are commonly used to control spoilage fungi: physical ones such as drying, freeze drying, cold storage, modified atmosphere storage, irradiation, the pasteurization of packaged bread and heat treatment; and chemical ones, in general based on the use of organic acids such as propionic acid and its salts (Farkas, 2001; Legan, 1993). Heat treatment is one of the most important physical factors in controlling fungi growth and mycotoxin production, as mycotoxins are destroyed by heat, although the effectiveness of destruction is affected by the food matrix and the composition of the mycotoxin (Scott, 1984). Mycotoxins have different heat stability - for example, ochratoxin A is highly stable even at 200 ºC (Trivedi et al., 1992), aflatoxins are destroyed only at temperatures of approximately 250 ºC (Levi, 1980), while zearalenone and fumonisin require high temperatures between 150-200 ºC to be efficiently destroyed (Bennett et al., 1980). Microwaves are effective in destroying mycotoxins - the aflatoxin in peanuts is reported to be destroyed using microwaves at a power level of 1.6 kW for 16 min and at 3.2 kW for 5 min (Luter et al., 1982). Among the physical methods, a modified atmosphere and gamma irradiation are preferred to the chemical methods and they have been used successfully in grain storage (Shapira & Paster, 2000).
Chemical methods that use weak acids and salts such as propionic, sorbic and benzoic acids, are usually applied only to inhibit the growth of spoilage microorganisms. The allowable concentrations of sorbate, propionate and ethanol have a limit up to 0.2% (wt/wt), 0.3% (wt/wt) and 2% (wt/wt) respectively. The use of such low concentration may not be sufficient to prevent the growth of spoilage fungi (Dantigny et al., 2005; European Union, 1995). Propionic acid is inhibitory to fungi and Bacillus spores and has commonly been used to preserve bakery products. Its activity relies on the un-dissociated form which, at low pH, has optimum activity (Coda et al., 2008; Pattison et al., 2004). The use of propionic acid at a concentration of 4% led to the appearance of cancer-like tumours in rats and eventually led to the prohibition of the use of calcium propionate in some European countries (Pattison et al., 2004). There is a major concern with microorganisms that can develop resistance to chemical preservatives, namely food spoilage and human pathogen fungi resistant to antibiotics and chemicals additives, such as sorbic and benzoic acids (Brul & Coote, 1999; Lourens-Hattingh & Viljoen, 2001). Calcium propionate has been reported to inhibit the growth of many fungi but, after a lag phase, it stimulated the growth of resistant strains of Penicillium roqueforti (Suhr & Nielsen, 2004). Interest in natural bio-preservation from LAB has been on the rise as an alternative to chemical preservatives.
5. Significance of the metabolites of LAB
LAB are well known for their antifungal activity, which is related to the production of a variety of compounds including acids, alcohols, carbon dioxide, diacetyl, hydrogen peroxide, phenyllactic acid, bacteriocins and cycle peptides (Gerez et al., 2009; Lavermicocca et al., 2000; Magnusson et al., 2003; Prema et al., 2008). These compounds were added to several foods in order to conserve them from food-borne and spoilage microorganisms. Organic acids are the main product of LAB in the fermentation systems of the raw materials. The main acids produced by LAB are lactic acid and acetic acid, besides certain other acids depending upon the strain of LAB (El-Ziney, 1998). These acids will be diffused through the membrane of the target organisms in their hydrophobic un-dissociated form and then used to reduce the cytoplasmic pH and stop metabolic activities (Piard & Desmazeaud, 1991). Other factors that contribute to the preservative action of the acids are the sole effect of pH, the extent of the dissociation of the acid and the specific effect of the molecule itself on the microorganisms (Axelsson, 1998).
Bacteriocins exhibit good potential for use in the food industry and as bio-preservation agents (Ennahar et al., 1999). Bacteriocins are small, ribosomally synthesized, antimicrobial peptides or proteins that display inhibition activity toward related species, with no reports about fungal inhibition (Cotter & Ross, 2005). The notable property of LAB supernatant is the heat stability of the antifungal compounds present in it. This will promote the use of LAB supernatant and/or antifungal compounds in heat-treated foods. The supernatant of certain LAB observed to be active within a wide range of pH, starting from as low as 3 and up to 9 depending upon the strain (Muhialdin et al., 2011b). This could be considered as a major factor whereby LAB are used in food preservation when compared with the chemical preservative which are usually active at low pH between 3 and 4.5. Additionally, LAB have a broad spectrum of antifungal activity against several food spoilage and mycotoxin-producing fungi while commercial preservatives are usually used to control only one or few fungi.
6. Bioactive compounds as antifungal agents
Several lactobacilli species are reported to have antifungal activity (Gerez et al., 2009; Muhialdin et al., 2011b; Plockova et al., 2001; Stiles et al., 1999). The antifungal compounds consist of organic acids, reuterin, hydrogen peroxide and other peptides (Table 1). The organic acids are active at low pH and the activity relies on the un-dissociated form of the acids. Recently, interest has dramatically increased in the use of bioactive peptides produced by LAB as an antifungal agent. The use of protein-like compounds are preferred over the use of acids because their activity is present over a wide range of pH and they are heat stable compounds which are ideal for use in heat processed foods (Muhialdin et al., 2011a). Cyclic dipeptides cyclo (Phe-Pro) and cyclo (Phe-OH-Pro) were produced by the L. coryniformis subsp. coryniformis Si3 strain and were inhibitory to Aspergillus sp. (Magnusson, 2003; Ström et al., 2002). Ryan et al. (2011) observed that sourdough made with L. amylovorus DSM 19280 had a longer shelf life compared with bread produced with calcium propionate. The selected strain inhibited the growth of Fusarium culmorum FST4.05, Aspergillus niger FST4.21, Penicillium expansum FST4.22, Penicillium roqueforti FST4.11 and L. amylovorus DSM 19280 and produced seventeen antifungal compounds.
Rhizopus oryzae, A. niger, A. flavus, Penicillium spand F. oxysporum
Ogunbanwo et al. (2008)
Acetic acid, phenyllactic acid
L. reuteri 1100
F. graminearum
Gerez et al. (2009)
(cyclo(Leu–Leu))
L. plantarum AF1
Aspergillus flavus ATCC 22546
Yang & Chang (2010)
Four peptides and organic acid mixture
L. plantarum LB1 and L. rossiae LB5
Penicillium roqueforti DPPMAF1
Rizzello et al. (2011)
Mixture of peptides
L. plantarum 1A7 (S1A7)
Broad spectrum
Coda et al. (2011)
Possibly protein-like
L. fermentum Te007, P. pentosaceus Te010, L. pentosus G004, and L. paracasi D5
A. niger and A. oryzae
Muhialdin et al. (2011a)
nine carboxylic acids, two nucleosides, sodium decanoate and five cyclic dipeptides
L. amylovorus DSM 19280
A. niger FST 4.21, A. fumigatus J9, F. culmorum TMW 4.0754 P. expansum FST 4.22 and P. roqueforti FST 4.11
Ryan et al. (2011)
3-phenyllactic acid and Benzene acetic acid, 2- propenyl ester
L. plantarum IMAU10014
Botrytis cinerea, Glomerella cingulate, Phytophthora drechsleri Tucker, P. citrinum, P. digitatum and F. oxysporum
Wang et al. (2012)
Table 1.
Antifungal compounds produced by lactic acid bacteria and their target fungi
7. Method for determining antifungal activity
Rapid, reliable and sensitive methods for the detection of the antifungal activity of LAB becomes essential in the search for new replacements for chemical preservatives with potential industrial applications.
7.1. Dual agar overlay method
This method has been described by several authors (Magnusson & Schnürer, 2001; Ström et al., 2002; Hassan & Bullerman, 2008) and it is accurate and simple for determining the antifungal activity of LAB isolates. The method consists of inoculating the LAB cells in two 2-cm-long lines and/or small circle spots on a MRS agar surface then incubating the plates at 30 °C for 24-48 h in anaerobic jars. The plates are overlaid with 10 ml of malt extract soft agar (2% malt extract, 0.7% agar; Oxoid) containing different concentrations of the spore inoculant of 104 and 105 spore/ml. The plates are then incubated aerobically at 30 °C for 48-72 h. The inhibition activity is indicated by the clear zones around the bacterial streaks. The scale for measuring the activity can be recorded as follows: -, no activity; +, no fungal growth on 0.1 to 3% of the plate area; ++, no fungal growth on 3 to 8% of the plate area; and+++, no fungal growth on 8% of plate area. Another way to measure the activity is by recording the clear zone diameter around the isolates streak, which refers to the inhibition of the fungi growth. The dual agar overlay method is also a good method for the screening of the antifungal activity of the supernatant of LAB isolates. The supernatant can be mixed with the de Man, Rogosa and Sharpe (MRS) agar or potato dextrose agar (PDA) and poured into Petri dishes followed by a similar step, mentioned previously. The supernatant can be added to the agar before it is autoclaved in order to determine the heat stability of the antifungal compounds present in the supernatants, which is a good indicator of whether the supernatant is used in heat processed foods.
7.2. Agar well diffusion method
The well diffusion method is another approach for determining the antifungal activity of LAB, described as a simple, accurate and flexible method. It is suitable to determine the inhibition activity of LAB supernatant. A fungi numbering 104 -105 spore/ml are mixed with the selected agar and allowed to solidify. The wells can be made on a variety of agar surfaces - for example, wells are made on potato dextrose agar if the target is a fungi or on a nutrient agar if the target is a bacteria; the wells are made by using a sterilized cork borer with a diameter of 3 or 5 mm. 50 µl of the same agar is added to each well in order to seal the base so as to avoid leakage. The cell-free supernatants are then added to wells in amounts of 30-80 µl and incubated at room temperature for 3-6 h in order to allow the supernatant to be diffused through the agar. The antifungal activity is recorded by measuring the clear zones\' diameters around the wells.
7.3. Dry weight of biomass
The reduction of the biomass of the fungi can be a tool for determining the growth inhibition activity of the supernatant. 50 ml of the supernatant is inoculated into a 250 ml flask containing the growth medium for the target fungi and then the suspension of the fungi spores is added at a concentration of 105. The fungal mass is harvested on filter paper and dried in an oven at 50 °C for 2 days. The average of the fungal biomass inhibition can be calculated by comparing the weight of treated fungi with the positive control which contains the fungi and the growth medium with no supernatant.
7.4. Micro-titter 96 well plate
The method is simple, inexpensive and practical for determining antibacterial and antifungal activity. The supernatant of LAB is placed into the wells of 190 µl and inoculated with 10 µl of a conidial suspension containing about 104-105 spore/ml. The plates are then incubated at 25-30 °C. The control is a conidial suspension placed in the wells in equal amounts without the addition of the LAB supernatant. Fungal growth is observed by the naked eye and determined by measuring the optical density at 560-580 nm, starting from 0 h and repeated every 24 h with a spectrophotometer. The result can be obtained by comparing the OD readings of the control with the treated wells. The method is appropriate for evaluating the MIC, heat stability, enzyme activity and effects of pH for the LAB supernatant.
8. Effect of the addition of LAB on bread quality
8.1. Shelf life
Traditionally, chemical preservatives and fungicides are used to inhibit fungal growth but concerns about environmental pollution and consumer health, along with problems of microbial resistance, favour the demand for alternative methods in controlling the growth of fungi (Druvefors et al., 2005). The shelf life of bread has been reported to be extended when certain LAB strains were added to bread formulations (Muhialdin et al., 2011a; Ogunbanwo et al., 2008; Rizzello et al., 2010; Ryan et al., 2011) (Table 2). The use of safe microbes in bread to extend the shelf life of the product is a great research area. Since LAB isolates are safe for use in foods, they are a significant alternative to chemical preservatives. Several researchers in the area of the bakery industry have successfully added LAB to dough and these strains grew well, producing the desired antifungal compounds in the dough.
Various fungi isolated from bakeries were inhibited by L. plantarum (LB1) and L. rossiae (LB5) isolated from raw wheat germ. Organic acids and peptides synthesized during fermentation were responsible for the antifungal activity; formic acid had the highest inhibition activity (Rizzello et al., 2011). However, the inhibitory compounds characterized were different, depending upon the LAB strains and flour type used. Dal Bello et al., (2007) characterized lactic acid, phenyllactic acid (PLA), cyclic dipeptides cyclo (L-Leu–L-Pro) and cyclo (L-Phe–L-Pro) produced by L. plantarum FST 1.7 and found them to inhibit the growth of Fusarium spp. in wheat bread. Ryan et al., (2008) reduced the use of calcium propionate from 3000 ppm to 1000 ppm when using sourdough fermented with L. plantarum FST 1.7 (LP 1.7) and L. plantarum FST 1.9 (LP 1.9), in which the growth of A. niger, F. culmorum and P. expansum was delayed for over six days while the growth of P. roqueforti appeared after three days of incubation at 30 °C. L. plantarum VTT E-78076. Pediococcus pentosaceus VTT E-90390 was reported to inhibit the growth of rope-forming Bacillus subtilis and Bacillus licheniformis in laboratory conditions and in the bread when the selected strains were inoculated to sourdough and subsequently 20-30 g of the inoculated sourdough was added to 100 g of wheat dough (Katina et al., 2002). Lavermicocca et al. (2000) found that L.
Strains
No. of days
Target fungi
Storage temperature °C
Reference
L. plantarum 21B
7
Broad spectrum
20
Lavermicocca et al., (2000)
L. plantarum
12
Rhizopus oryzae A. niger A. flavus Penicillium sp. F. oxysporum
27
Ogunbanwo et al., (2008)
L. brevis AM7
21
P. roqueforti DPPMAF1
25
Coda et al., (2008)
L. plantarum
10
A. niger, F. culmorum, and P. expansum
25
Ryan et al., (2008)
L. plantarum CRL 778, L. reuteri CRL 1100, and L. brevis CRL 772 and CRL 796
8
Aspergillus, Fusarium, and Penicillium
30
Gerez et al., (2009)
L. plantarum 1A7 (S1A7)
28
P. roqueforti DPPMAF1
25
Coda et al., (2011)
L. amylovorus DSM 19280
14
F. culmorum FST 4.05, A. niger FST4.21, P. expansum FST 4.22, P. roqueforti FST 4.11
25
Ryan et al., (2011)
L. fermentum Te007, P. pentosaceus Te010, L. pentosus G004, and L. paracasi D5
9-12
A. niger and A. oryzae
30
Muhialdin et al., (2011)
Table 2.
Delay of the appearance of fungal growth on bread with added lactic acid bacteria cells
plantarum 21B inhibited the bread spoilage fungi Aspergillus, Fusarium, Penicillium and Eurotium; the active compounds were phenyllactic and 4-hydroxyphenyllactic acids. The growth of Aspergillus niger appeared after two days in the control sample while L. plantarum 21B delayed the growth of the stated fungi for seven days at 20 °C.
8.2. Flavour
Flavour is one of the most valued sensory attributes in bread - volatile and non-volatile compounds produced during the fermentation of dough contribute to bread\'s flavour. Reports show that the fermentation of dough with LAB can enhance the aroma and flavour (Ryan et al., 2011; Muhialdin et al., 2011a). The growth of fungi is responsible for the formation of off-flavours and the production of mycotoxins; adding LAB to dough can prevent the growth of fungi and enhance the flavour of bread. The produced compound plays an important role for any technological application to enhance the flavour, such as diacetyl which gives a buttery flavour. Sourness in white bread indicates spoilage in contrast to the sourness of sourdough bread; for this reason, the search for new LAB for application in white bread becomes essential. Finding a new LAB strain that produces less acid and does not drop the pH below 4 will mark a good strategy for resolving such an issue. The addition of L. paracasi D5 and L. fermentum Te007 in the production of white bread resulted in an improved aroma and a pleasant caramel-like flavour in the baked bread itself (Muhialdin et al., 2011a).
8.3. Quality and acceptability
The quality of bread produced with LAB as a starter culture was reported to improve the texture and the quality of bread by increasing the air cells (Coda et al., 2008; Katina et al., 2002; Lavermicocca et al., 2000). Baker’s yeast - also referred to as \'baking yeast\' (Saccharomyces cerevisiae) - has the ability to ferment different carbohydrates and produce CO2; the most important factor involving baking yeast in bread manufacturing is to leaven the dough during the bread\'s preparation. The presence of antimicrobials in the dough is used to inhibit the growth of spoilage microorganisms that can affect the growth of the baker’s yeast and delay the fermentation of dough, thereby resulting in economic losses to the bakery industry (Pattison & von Holy, 2001). Baking yeast is a excellent producer of the necessary flavour and aroma compounds from the products of secondary metabolism (Evans 1990).
Pattison & von Holy (2001) found that the presence of propionic salts reduced the baking yeast activity by up to 34.4% in an in vitro study carried out using several natural antimicrobials with positive control calcium propionate. In comparison, lactic acid and acetic acid displayed slight effects on the activity reduction of the yeast compared with the positive control. Baking yeast and lactic acid bacteria commonly have live symbiotically in the natural ecosystem of fermenting food and beverages (Kenns et al., 1991). The volume of the dough was increased by adding sourdough containing L. amylovorus DSM 19280 when compared with chemical acidification (Ryan et al., 2011). Rizzello et al. (2010) reported the improvement of bread texture properties and the delaying of the staling of the bread because of the anti-staling effect produced by LAB and the synthesis of antifungal compounds. As mentioned previously, S. cerevisiae is responsible of leaving the dough and giving the most desirable texture to the bread.
The key role in achieving the optimum growth and activity of the bakery yeast is played by selecting a LAB that does not exhibit inhibition activity against the bakery yeast. Before choosing the LAB to be added to the dough as a co-starter, a simple experiment can be conducted in order to examine the tolerance of the bread yeast to the selected LAB strain. In a test tube mix of 10 ml water, 5 g of white flour, the LAB strain and baking yeast, we incubate and observe the production of gas at the top of the tube, which is a good indicator of the yeast activity. Ogunbanwo et al. (2008) isolated LAB from retted cassava and studied the effects of lactic acid bacteria as a starter co-culture in combination with S. cerevisiae in order to produce cassava-wheat bread. The improvement in the nutritional contents, physical properties and the extension of the shelf life were reported. Bread produced using L. acidophilus and L. brevis had the highest acceptability on average in relation to the bread produced with other strains of LAB. The use of LAB in bread in terms of improving the quality of wheat bread, bread volume and crumb structure has been reported (Clarke et al., 2002; Zannini et al., 2009).
8.4. Enhancement of a specific nutrient
LAB fermentation in dough has been approved for enhancing the nutritional value and digestibility of bread. Vitamin B, organic acids and the free amino acids produced through the fermentation of LAB can enhance the nutrients\' presence in bread. The human body cannot synthesize B-group vitamins and this is why the body needs an external source of the vitamins. Certain LAB has been proven to synthesize B-group vitamins during the fermentation of foods; at the same time, LAB are considered to be the perfect vehicle for delivering the vitamins to the human body.
There are reports about the production of B-group vitamins by LAB isolates. Keuth and Bisping (1993) described the production of Riboflavin (Vitamin B 2) by Streptococcus and Enterococcus isolated from tempeh (Indonesian fermented food). Folates were observed to be produced by L. plantarum in low amounts (Sybesma et al., 2003). Vitamin B 12 (Cobalamin) was also produced by L. reuteri as well as the other groups of vitamin B (Santos et al., 2008). LAB enzymatic activity by proteases that take place during dough fermentation will release small peptides and free amino acids, which are considered to be important nutrients that should be present in bread in high quantities (Thiele et al., 2002). Essential amino acids, including lysine, threonine, phenylalanine and valine were reported to be produced by LAB (Gerez et al., 2006). The enzymes produced by LAB including amylases, proteases, phytases and lipases improve the food quality through the hydrolysis of polysaccharides, proteins, phytates and lipids. Anti-nutrients such as phytic acid and tannins can be reduced by LAB fermentation in food, leading to increased sensory properties of the bread (Chelule et al., 2010). The growth of fungi in food materials can cause the synthesis of allergenic spores and hazardous mycotoxins, which will lead to the reduction of the nutritional value of food stuffs. Adding 4% of fermented sourdough to the white wheat flour improved the texture and physical sensation of the bread. Furthermore, it enhanced the free amino acids, protein digestibility, phytase and antioxidant activities (Rizzello et al., 2010).
9. Starter cultures for the bread industry
Lactic acid bacteria were reported as being used as a starter culture or co-culture in the bread industry with success in terms of survivability in dough (Lavermicocca et al., 2000; Rezzillo et al., 2011). The use of lactic acid bacteria as an antifungal agent or as a starter culture for bakery and processed foods can solve two global issues; firstly, it can extend the shelf life of the food products, which will reduce their cost and the need for low temperatures, secondly, it will satisfy the high demand of modern consumers for high quality food that is free of chemicals. Above all, the product must be safe with an extended shelf life and good sensory properties.
10. Production of LAB cells and inhibitory compounds
10.1. Growth medium
The growth of LAB and the production of antifungal compounds are largely affected by the food matrix itself (Helander, 1997). Most of the studies regarding the antifungal activity of LAB were done using the universal MRS agar. As demonstrated earlier, there are few studies that evaluate the ability of LAB isolates to produce the active compounds in non-defined media as well as few in situ studies. The challenge for the food industry is the need for the high production of biomass and the bioactive compounds using an inexpensive fermentation growth medium. A defined medium is all well and necessary for laboratory screening purposes but it is not suitable for heavy industrial plant. The question here is whether the selected LAB can produce the biomass and maintain the antifungal activity. In our laboratory, L. fermentum Te007, Pediococcus pentosaceus Te010, L. pentosus G004 and L. paracasi D5 were used to ferment white bread dough and they maintained the antifungal activity, as detected using MRS agar, indicating that these isolates produced the antifungal compounds in the bread dough (Muhialdin et al., 2011a). Pediococcus pentosaceus Te010 was further investigated for its ability to grow in formulated media from plant extracts supplemented with the basic growth needs of LAB, such as vitamins, carbohydrates, nitrogen sources and salts. The results indicated that the selected isolate was able to grow in the formulated media and maintain the production of the antifungal activity but, unfortunately, the compounds have not yet been characterized (unpublished data).
10.2. Growth conditions
The growth conditions of any microbe are the key to success during the fermentation process. As for LAB, the generally optimum temperature for growth is 37 °C for 48 h in anaerobic conditions. This is not exactly what can be applied for the production of antagonistic fungal inhibitor compounds. Some of the LAB are psychrophilic and prefer low temperatures for their growth while others are thermophilic and prefer high temperatures for their growth. This should be considered as a significant factor because the optimum growth temperature has a significant impact on the production of antifungal compounds. As well as temperature, the incubation time has a significant effect on the production of antifungal compounds with respect to the availability of nutrients in the growth medium and the production of primary or secondary metabolites.
11. Future research
The high demand by consumers for foods free of chemical preservatives has led to increasing amounts of research to provide alternatives for these chemicals. LAB provides technologically practicable alternatives for the replacement of chemical preservatives. The achievement of selecting LAB as starter cultures or co-cultures in fermentation processes can improve the desired properties of bread, at the same time providing consumers with new chemical-free foods. There is a need to study the interaction between the food matrix and the kinetics of the starter culture of LAB in bread; such studies will contribute to the bread industry by increasing the yield of the antifungal and nutritional compounds produced by LAB. Besides using the LAB cells in bread formulations, the use of the supernatant of LAB should be considered, especially the supernatant of LAB that are grown in non-conventional media such as plant extract and other cheap materials. Additional studies on the contribution of bioactive molecules to the quality and shelf life of foods will surely widen the use of LAB strains as a novel bio-control strategy in bakery products.
12. Conclusion
LAB can be used as a starter culture or a co-culture in the bread industry to enhance the sensory properties of bread and extend the shelf life. The nutritional value of the bread is enhanced due to the production of free amino acids, organic acids and a variety of Group-B vitamins. The antifungal compounds produced by LAB are important for the food industry for replacing or reducing the use of chemical preservatives. Several methods have been developed to determine the antifungal activity of the cells and the free cell supernatant. Natural sources of food preservatives - especially LAB - are important and reflect one possibility for fulfilling the needs of modern consumers of bakery products that are free of chemicals. Challenges are evident in finding new and novel isolates of LAB that can be applied in bread and which do not affect the activity of the yeast or inhibit their growth. Future works should consider the use of the LAB supernatant as well as the cells because the active compounds can be present in the supernatant. Inexpensive media are also important for high-scale industry, especially the use of plant extracts that are rich in carbohydrates and which can be supplied in bulk over the course of the year.
\n',keywords:null,chapterPDFUrl:"https://cdn.intechopen.com/pdfs/42320.pdf",chapterXML:"https://mts.intechopen.com/source/xml/42320.xml",downloadPdfUrl:"/chapter/pdf-download/42320",previewPdfUrl:"/chapter/pdf-preview/42320",totalDownloads:4701,totalViews:525,totalCrossrefCites:0,totalDimensionsCites:0,hasAltmetrics:0,dateSubmitted:"November 15th 2011",dateReviewed:"June 25th 2012",datePrePublished:null,datePublished:"January 30th 2013",dateFinished:null,readingETA:"0",abstract:null,reviewType:"peer-reviewed",bibtexUrl:"/chapter/bibtex/42320",risUrl:"/chapter/ris/42320",book:{slug:"lactic-acid-bacteria-r-d-for-food-health-and-livestock-purposes"},signatures:"Belal J. Muhialdin, Zaiton Hassan and Nazamid Saari",authors:[{id:"140861",title:"MSc.",name:"Belal",middleName:null,surname:"Muhialdin",fullName:"Belal Muhialdin",slug:"belal-muhialdin",email:"belaljamal.mahialdin@yahoo.com",position:null,institution:null}],sections:[{id:"sec_1",title:"1. Introduction",level:"1"},{id:"sec_2",title:"2. Sources of LAB",level:"1"},{id:"sec_3",title:"3. Spoilage fungi in food",level:"1"},{id:"sec_4",title:"4. Common techniques to control spoilage fungi in bakery products",level:"1"},{id:"sec_5",title:"5. Significance of the metabolites of LAB",level:"1"},{id:"sec_6",title:"6. Bioactive compounds as antifungal agents",level:"1"},{id:"sec_7",title:"7. Method for determining antifungal activity",level:"1"},{id:"sec_7_2",title:"7.1. Dual agar overlay method",level:"2"},{id:"sec_8_2",title:"7.2. Agar well diffusion method",level:"2"},{id:"sec_9_2",title:"7.3. Dry weight of biomass",level:"2"},{id:"sec_10_2",title:"7.4. Micro-titter 96 well plate",level:"2"},{id:"sec_12",title:"8. Effect of the addition of LAB on bread quality",level:"1"},{id:"sec_12_2",title:"8.1. Shelf life",level:"2"},{id:"sec_13_2",title:"8.2. Flavour",level:"2"},{id:"sec_14_2",title:"8.3. Quality and acceptability",level:"2"},{id:"sec_15_2",title:"8.4. Enhancement of a specific nutrient ",level:"2"},{id:"sec_17",title:"9. Starter cultures for the bread industry",level:"1"},{id:"sec_18",title:"10. Production of LAB cells and inhibitory compounds",level:"1"},{id:"sec_18_2",title:"10.1. Growth medium",level:"2"},{id:"sec_19_2",title:"10.2. Growth conditions",level:"2"},{id:"sec_21",title:"11. Future research",level:"1"},{id:"sec_22",title:"12. Conclusion ",level:"1"}],chapterReferences:[{id:"B1",body:'AbellanaM. LTorresV. Sand A. JRamos1997Caracterizacio´n de diferentesproductos de bollería industrial. II. Estudio de la Microflora. Alimentaria, 2875156'},{id:"B2",body:'AxelssonL1998Lactic acid bacteria: Classification and physiologyIn Lactic Acid Bacteria: Microbiology and functional aspects, 2nd Edition, Revised and Expanded. Edited by S. Salminen & A. von Wright. 172Marcel Dekker, Inc. New York.'},{id:"B3",body:'BennettG. AShotwellO. Land HesseltineC. 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Hand HugenholtzJ2003Effects of cultivation conditions on folate production by lactic acid bacteria. Applied and Environmental Microbiology, 6945424548'},{id:"B70",body:'ThieleCGänzleM. Gand VogelR. F2002Contribution of sourdough lactobacilli, yeast, and cereal enzymes to the generation of amino acids in dough relevant for bread flavor. Cereal Chemistry, 794551'},{id:"B71",body:'TrivediA. BDoiEand KitabatakeN1992Detoxification of ochratoxin A on heating under acidic and alkaline conditions. Bioscience, Biotechnology and Biochemistry, 56741755'},{id:"B72",body:'VandenberghP. Aand KankaB. S1989Antifungal product. United States Patent. 4,877,615.'},{id:"B73",body:'WangHYanYWangJZhangHQiW2012Production and Characterization of Antifungal Compounds Produced by Lactobacillus plantarum IMAU10014. PLoS ONE, 7(1): e29452. doi:10.1371/journal.pone.0029452'},{id:"B74",body:'WhittenburyR1964Hydrogen peroxide formation and catalase activity in the lactic acid bacteria. Journal of General Microbiology,\n\t\t\t\t\t351326'},{id:"B75",body:'YangE. Jand ChangH. C2010Purification of a new antifungal compound produced by Lactobacillus plantarum AF1 isolated from kimchi. International Journal of Food Microbiology, 1395663'},{id:"B76",body:'ZanniniEGarofaloCAquilantiLSantarelliSSilvestriGand ClementiF2009Microbiological and technological characterization of sourdoughs destined for bread-making with barley flour. Food Microbiology, 26744753'}],footnotes:[],contributors:[{corresp:null,contributorFullName:"Belal J. Muhialdin",address:null,affiliation:'
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1. Introduction
Health psychology explores different ways in the pursuit of getting people to embrace health promotion, illness prevention and health maintenance. As a speciality, health psychology examines how biological, psychological and social factors influence people’s behaviour about their health status. The aim of this chapter is to examine possible contributory connections between bio-psychosocial factors and health at the population level. The book explores bio-psychosocial model which can help individuals to develop and maintain healthy lifestyles so as to promote good health and prevent illness. Friedman and Adler [1] noted that the original bio-psychosocial model shaped not only research and theory on health but also the development of health psychology.
2. Definitions
2.1 Health
Kazarian and Evans [2] suggest that people commonly think about health in terms of an absence of (1) objective signs that the body is not functioning properly and (2) subjective symptoms of disease or injury, such as pain or nausea. World Health Organization defined health as ‘a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity’ (WHO, 1946 cited in [3]:4). Some health psychologists defined health as a positive state of physical, mental and social well-being not simply the absence of injury or disease that varies over time along a continuum [4]. At the wellness end of the continuum, health is the dominant state. At the other end of the continuum, the dominant state is illness or injury, in which destructive processes produce characteristic signs, symptoms or disabilities [4]. For further detail, see Figure 1.
Figure 1.
Health (source: adopted from Sarafino [4]).
2.2 Health psychology
Health psychology is a speciality within the discipline of psychology concerned with individual behaviours and lifestyles affecting physical health. The discipline strives to enhance health, prevent and treat disease, identify risk factors and improve the healthcare system public opinion regarding health issues [5]. Matarazzo in 1980 (as cited in [3]:4) offered a definition of health psychology which has become widely accepted:
Health psychology is the aggregate of the specific educational, scientific and professional contributions of the discipline of psychology to the promotion and maintenance of health, the prevention and treatment of illness, the identification of etiologic and diagnostic correlates of health, illness and related dysfunction, and the analysis and improvement of the health care system and health policy formation.
2.3 The goals of health psychology
Sarafino ([4]:11) mentioned the following goals of health psychology as to:
Promote and maintain health
Prevent and treat illness
Identify the causes and diagnosis correlates of health, illness and related dysfunction
Analyse and improve healthcare systems and health policy
2.4 Background of health psychology to public health
The recognition of health psychology as a designated field is widely acknowledged. The relationship between mind and body and the effect of one upon the other has always been a controversial topic amongst philosophers, psychologists and physiologists. Within psychology, the development of the study of psychosomatic disorders owes much to Freud [3]. It has been observed in the recent studies that more deaths are caused now by heart disease, cancer and strokes which are by-product of changes in lifestyles in the twentieth century. Psychologists can be instrumental in investigating and influencing lifestyles and behaviours which are conducive or detrimental to good health [3].
2.5 Health behaviours
Health behaviour is part of maintaining a healthy lifestyle and avoiding ill health. These are known as protective health behaviours. Health protective behaviours include the following categories:
Environmental hazard avoidance—avoiding areas of pollution or crime.
Harmful substance avoidance—not smoking or drinking alcohol.
Health practices—sleeping enough, eating sensibly and so forth.
Preventive health care—dental check-ups and smear tests.
Safety practices—repairing things, keeping first aid kits and emergency telephone numbers handy.
Although most of us are familiar with the need to engage in these health behaviours, only a few of us actually do so, and that is what we need to work on to remind people of adopting a better health lifestyles. Many other researchers such as Berg (1976 as cited in Pitts, 1998) asserted that most people are aware of which health behaviours should be engaged in; however, they frequently do not do so, and they instead do engage in activities which they know to be harmful to their health. It is this cantankerousness which psychologists have spent a great deal of time examining. The dilemma for health psychologists is to explain why some or many people do not do what they know is in their own best interest to do and why some people are more amenable to the adoption of healthy habits than others.
This chapter is therefore in support of a consistent focus on the role of knowledge in informing people of the risks to themselves that certain behaviours can engender. Pitts [3] reported studies that examining a range of issues relevant to health such as smoking, drug-taking, medical checks and adopting safer sex have fairly consistently shown that knowledge, by itself, does not lead to behaviour change. The only question left to ask is: So what is required, other than knowledge, to persuade people to look after their health? This question is the guiding principle to understand the role of health psychology in persuading people to look after their health informed by bio-psychosocial model.
2.6 Models of health
It is generally recognized that there are two models of health, namely, biomedical and bio-psychosocial models. Biomedical model focuses on treatment and elimination of symptoms, while bio-psychosocial model focuses on individual’s perception of their symptoms and how they and their families respond to symptoms they are experiencing [6]. Also Deacon [7] asserts that under the biomedical model, illnesses were understood as having physiological aetiologies that were diagnosed through distinct biochemical markers and were to be treated through physical interventions. This chapter however is primarily focusing only on the bio-psychosocial models of health. Its founder, Engel [8], discovered that bio-psychosocial model represents the contribution of biological, psychological and social factors in determining health. Table 1 shows the differences between the two models.
Focal area
Biomedical model
Bio-psychosocial model
What causes illness?
Biological factors (chemical imbalances, bacteria, viruses and genetic predisposition)
Biological (virus), psychological (beliefs, behaviour) and social (unemployment)
Who is responsible for illness?
Individuals are regarded as victims of some external force causing internal changes. Because illness is seen as a result of biological changes beyond their control, individuals are not seen as responsible for their illness
Individuals should be held responsible for his/her health and illness
How should illness be treated?
Through vaccination, surgery, chemotherapy and radiotherapy, all of which aim to change the physical state of the body
The whole person should be treated, e.g. behaviour change, change in beliefs and coping strategies and compliance with medical recommendations
Who is responsible for treatment?
The responsibility for treatment rests with the medical profession
The focus is the whole person to be treated not just their physical illness; the patient is therefore responsible for their treatment (e.g. taking the medication or changing their behaviour)
What is the relationship between health and illness?
Health and illness are seen as qualitatively different—you are either healthy or ill—there is no continuum between the two
Health and illness exist on a continuum. Individuals progress along this continuum from health to illness and back again
What is the relationship between the mind and the body?
The mind and body function independently of each other. In other words, the mind and body are separate entities
The focus is on an interaction between the mind and the body. The mind and body interact
What is the role of psychology in health and illness?
Illness may have psychological consequences, but not psychological causes (e.g. cancer may cause unhappiness, but mood is not seen as related to either the onset or progression of the cancer)
Psychological factors not only as possible consequences of illness but as contributing to it at all stages along the continuum from healthy to being ill
Table 1.
Comparing biomedical and bio-psychosocial models of health.
Within health psychology one model that has enjoyed considerable popularity is the ‘stress-diathesis’ model (Steptoe cited in [3]) which is currently called bio-psychosocial model. This model was first described by G.L. Engel in 1977. It emphasizes the interactive effect of environment and individual vulnerability (genetic and psychological characteristics) factors upon health [3]. According to bio-psychosocial model, psychological, physical and social threats present demands upon an individual’s resources and capacity for coping which give rise to physiological reactions involving the autonomic nervous system (ANS) and endocrine and immune system of the body.
The effects include both short-term and long-term components, and these may have consequences on health depending upon the individual’s predisposition or vulnerability to adverse effects. Vulnerable individuals develop chronic allostatic reactions such as reduced immunocompetence or exaggerated sympathetic activation of the ANS or increased secretion of adrenal hormones. Physiological reactions of these types have been implicated in the development of many disease states, including cancers, cardiovascular diseases and other non-communicable diseases susceptibility to infections [3]. The following section presents the strengths and critical views of bio-psychosocial model.
2.7 Strengths of bio-psychosocial model
Bio-psychosocial model benefits the patients and healthcare system as revealed by research [8, 9, 10, 11, 12, 13, 14]:
Guiding application of medical knowledge to the needs of each patient.
Improved patient satisfaction, better adherence to prescriptions, more maintained behaviour change, better physical and psychological health and less of a tendency to initiate malpractice litigations.
Development and application of techniques to reduce health risk behaviour.
Reduce multiple visits and admission into hospitals.
Individuals with health challenges are acknowledged to be active participants in the recovery process and good health, rather than mere passive victims.
Increase efficiency of care by reducing unnecessary prescription of drugs (i.e. diabetes and other chronic conditions).
Development of psychological techniques in the strengthening of immune reaction to illness.
Bio-psychosocial model can be used as a predictor of pain and other psychosocial problems resulting into development appropriate prevention and intervention strategies.
Improvement of communication between health staff and the patients.
Development and introduction of programmes of life quality improvement for chronic patients, physically disabled individuals and the elderly patients.
A significant influence on contemporary understanding of mental health difficulties.
Development and application of psychosocial support for the terminally ill patients and their families.
2.8 Critical views of bio-psychosocial model
A list of critical views of bio-psychosocial model has been noted in literature [9, 10, 12, 15, 16, 17, 18] as follows:
Time-consuming and expensive apply.
It requires more information be gathered during the assessment about an individual’s socioeconomic status, culture, religion, as well as psychological factors that might affect the individual’s condition.
There is a lack of theoretical basis of bio-psychosocial model and scientific evidence to support the model.
The complex relations between causes and effects of biological, psychological and social factors to influence the state of health and or occurrence of diseases.
The holistic nature of the bio-psychosocial model makes it a luxury many healthcare systems in resource-poor settings cannot afford.
Insufficient training opportunities or financial resources available to support the existence of multidisciplinary teams consisting of psychiatrists, clinical psychologists, mental health nurses and social welfare workers to allow for a full understanding of the biological, psychological and social factors involved in individual’s condition.
The model’s failure to provide straightforward guidelines for clinical treatment or rules for prioritization in clinical practice.
Medical students receive very limited amount of content in psychosocial subjects compared to biomedical-oriented courses.
3. Conclusion
The focus of this chapter was mainly on integrating bio-psychosocial model in public health discipline. Authors like Nadir et al. [12] found that bio-psychosocial model has been a mainstay in the ideal practice of modern medicine. It is attributed to improve patient care, compliance and satisfaction and to reduce physician-patient conflict. Both strengths and critical views of bio-psychosocial model were presented in the chapter. Even though it appears that patients and healthcare system are likely to benefit from the utilization of bio-psychosocial model, further research is still needed to determine whether or not bio-psychosocial model is a workable model in healthcare system to benefit all patients. In particular, more knowledge about how psychosocial factors can influence health and disease remain unclear to most public health professionals.
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Introduction",level:"1"},{id:"sec_2",title:"2. Definitions",level:"1"},{id:"sec_2_2",title:"2.1 Health",level:"2"},{id:"sec_3_2",title:"2.2 Health psychology",level:"2"},{id:"sec_4_2",title:"2.3 The goals of health psychology",level:"2"},{id:"sec_5_2",title:"2.4 Background of health psychology to public health",level:"2"},{id:"sec_6_2",title:"2.5 Health behaviours",level:"2"},{id:"sec_7_2",title:"2.6 Models of health",level:"2"},{id:"sec_8_2",title:"2.7 Strengths of bio-psychosocial model",level:"2"},{id:"sec_9_2",title:"2.8 Critical views of bio-psychosocial model",level:"2"},{id:"sec_11",title:"3. Conclusion",level:"1"}],chapterReferences:[{id:"B1",body:'Friedman HS, Adler NE. The history and background of health psychology. In: Friedman HS, Silver RC, editors. Foundations of Health Psychology. NY: Oxford University Press; 2007. pp. 3-18'},{id:"B2",body:'Kazarian SS, Evans DR. Health psychology and culture: Embracing the 21st century. In: Kazarian SS, Evans ER, editors. Handbook of Cultural Health Psychology. San Diego: Academic Press; 2001. pp. 3-43'},{id:"B3",body:'Pitts M. An introduction to health psychology. In: Pitts M, Phillips K, editors. The Psychology of Health. Routledge: Wadsworth Publishing; 1998'},{id:"B4",body:'Sarafino EP. Health Psychology: Biopsychosocial Interactions. 6th ed. New Jersey: John Wiley & Sons; 2008'},{id:"B5",body:'Brannon L, Feist J. Health Psychology: An Introduction to Behaviour and Health. 5th ed. Belmont, CA: Wadsworth Thomson; 2004'},{id:"B6",body:'Morof I, Lubkin PD, Larsen P. Chronic Illness: Impact and Interventions. Boston: Jones and Bartlett; 2002'},{id:"B7",body:'Deacon BJ. The biomedical model of mental disorder. A critical analysis of its validity, utility and effects on psychotherapy research. Clinical Psychology Review. 2013;33:846-861'},{id:"B8",body:'Engel GL. The need for a new medical model: A challenge for biomedicine. Science. 1977;196:129-136'},{id:"B9",body:'Babalola E, Noel P, White R. The bio-psychosocial approach and global mental health: Synergies and opportunities. Indian Journal of Social Psychiatry. 2017;33:291-296'},{id:"B10",body:'Borrell-Carrió F, Suchman AL, Epstein RM. The bio-psychosocial model 25 years later: Principles, practice, and scientific inquiry. The Annals of Family Medicine. 2004;2:576-582'},{id:"B11",body:'Kamper SJ, Apeldoorn AT, Chiarotto A, Smeets RJ, Ostelo RW, Guzman J, et al. Multidisciplinary bio-psychosocial rehabilitation for chronic low back pain: Cochrane systematic review and meta-analysis. British Medical Journal. 2015;350:h444'},{id:"B12",body:'Nadir M, Hamza M, Mehmood N. Assessing the extent of utilization of bio-psychosocial model in doctor-patient interaction in public sector hospitals of a developing country. Indian Journal of Psychiatry. 2018;60(1):103-108'},{id:"B13",body:'Stewart M, Brown JB, Donner A, McWhinney IR, Oates J, Weston WW, et al. The impact of patient-centered care on outcomes. The Journal of Family Practice. 2000;49:796-804'},{id:"B14",body:'Williams GC, Frankel RM, Campbell TL, Deci EL. Research on relationship-centered care and healthcare outcomes from the Rochester bio-psychosocial program: A self-determination theory integration. Journal of Family System Health. 2000;18:79-90'},{id:"B15",body:'Armstrong D. Silence and truth in death and dying. Social Science & Medicine. 1987;24(8):651-657'},{id:"B16",body:'Gatchel RJ, Oordt MS. Clinical Health Psychology and Primary Care: Practical Advice and Clinical Guidance for Successful Collaboration. Washington, DC: American Psychological Association; 2012'},{id:"B17",body:'Lane RD. Is it possible to bridge the bio-psychosocial and biomedical models? Biopsychosocial Medicine. 2014;8:3'},{id:"B18",body:'Suls J, Rothman A. Evolution of the bio-psychosocial model: Prospects and challenges for health psychology. Health Psychology. 2004;23:119-125'}],footnotes:[],contributors:[{corresp:"yes",contributorFullName:"Simon George Taukeni",address:"staukeni@gmail.com",affiliation:'
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The Open Access Scholarly Publishers Association (OASPA) was established in 2008 to represent the interests of Open Access (OA) publishers globally in all scientific, technical and scholarly disciplines. Its mission is carried out through exchange of information, the setting of standards, advancing models, advocacy, education, and the promotion of innovation.
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STM
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\\n\\t
The International Association of Scientific, Technical and Medical Publishers (STM) is the leading global trade association for academic and professional publishers. As a member, IntechOpen has not only made a commitment to STM's Ethical Principles.
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\\n\\n
COPE
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\\n\\t
The Committee on Publication Ethics (COPE) provides advice to editors and publishers on all aspects of publication ethics and, in particular, how to handle cases of misconduct in research and publication. IntechOpen has been a member of COPE since 2013 and adheres to the COPE Code of Conduct and Best Practice Guidelines, ensuring that we maintain the highest ethical standards.
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Creative Commons
\\n\\n
\\n\\t
Creative Commons (CC) is a nonprofit organization that enables the sharing and use of creativity and knowledge through free legal tools. IntechOpen uses the CC BY 3.0 license for chapters, meaning Authors retain copyright and their work can be reused and adapted as long as the source is properly cited and Authors are acknowledged.
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Crossref
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\\n\\t
Crossref is the official Digital Object Identifier (DOI) Registration Agency for scholarly and professional publications with a goal of making scholarly communications more effective. IntechOpen deposits metadata and registers DOIs for all content using the Crossref System. IntechOpen also deposits its references and uses the Crossref Cited-by service that enables researchers to track citation statistics.
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Altmetric and Dimensions from Digital Science
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\\n\\t
Digital Science is a technology company serving the needs of scientific and research communities at key points along the full cycle of research. They support innovative businesses and technologies that make all parts of the research process more open, efficient and effective. IntechOpen integrates tools such as Altmetric to enable our researchers to track and measure the activity around their academic research and Dimensions, to ease access to the most relevant information and better understand and analyze the global research landscape.
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CLOCKSS
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\\n\\t
CLOCKSS preserves scholarly publications in original formats, ensuring that they always remain available and openly accessible to everyone.
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Counter
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\\n\\t
COUNTER provides the Code of Practice that enables publishers and vendors to report usage of their electronic resources in a consistent way. This enables libraries to compare data received from different publishers and vendors.
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\\n\\n
DORA
\\n\\n
\\n\\t
DORA is a worldwide initiative covering all scholarly disciplines which recognizes the need to improve the ways in which the outputs of scholarly research are evaluated and seeks to develop and promote best practice. To date it has been signed by over 1500 organizations and around 14,700 individuals.
\\n
\\n\\n
iThenticate
\\n\\n
\\n\\t
iThenticate is the leading provider of professional plagiarism detection and prevention technology and is used worldwide by scholarly publishers and research institutions to ensure the originality of written work before publication. IntechOpen uses the iThenticate plagiarism software to ensure content originality and the research integrity of our published work.
\\n
\\n\\n
Enago
\\n\\n
\\n\\t
IntechOpen collaborates with Enago, through its sister brand, Ulatus, one of the world’s leading providers of book translation services. Their services are designed to convey the essence of your work to readers from across the globe in the language they understand.
\\n\\t
IntechOpen Authors that wish to use this service will receive a 20% discount on all translation services. To find out more information or obtain a quote, please visit https://www.enago.com/intech
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SPi Global
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\\n\\t
SPi Global is the market leader in technology-driven solutions for the extraction, enrichment and transformation of content assets. IntechOpen publishing services are designed to meet the unique needs of Authors. As part of our commitment to that objective, we have an ongoing partnership agreement for production solutions.
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Amazon
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\\n\\t
Amazon is the world’s largest online retailer and cloud services provider. IntechOpen books have been available on Amazon since 2017, guaranteeing more visibility for our Authors and Academic Editors.
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\\n\\n
DHL
\\n\\n
\\n\\t
IntechOpen has partnered with DHL since 2011 to ensure the fastest delivery of Print on Demand books.
The Association of Learned and Professional Society Publishers (ALPSP) is the largest association of scholarly and professional publishers in the world. Its mission is to connect, inform, develop and represent the international scholarly and professional publishing community. IntechOpen has been a member of ALPSP since 2016 and has consequently stayed informed about industry trends through connecting with peers and developing jointly.
\n
\n\n
OASPA
\n\n
\n\t
The Open Access Scholarly Publishers Association (OASPA) was established in 2008 to represent the interests of Open Access (OA) publishers globally in all scientific, technical and scholarly disciplines. Its mission is carried out through exchange of information, the setting of standards, advancing models, advocacy, education, and the promotion of innovation.
\n
\n\n
STM
\n\n
\n\t
The International Association of Scientific, Technical and Medical Publishers (STM) is the leading global trade association for academic and professional publishers. As a member, IntechOpen has not only made a commitment to STM's Ethical Principles.
\n
\n\n
COPE
\n\n
\n\t
The Committee on Publication Ethics (COPE) provides advice to editors and publishers on all aspects of publication ethics and, in particular, how to handle cases of misconduct in research and publication. IntechOpen has been a member of COPE since 2013 and adheres to the COPE Code of Conduct and Best Practice Guidelines, ensuring that we maintain the highest ethical standards.
\n
\n\n
Creative Commons
\n\n
\n\t
Creative Commons (CC) is a nonprofit organization that enables the sharing and use of creativity and knowledge through free legal tools. IntechOpen uses the CC BY 3.0 license for chapters, meaning Authors retain copyright and their work can be reused and adapted as long as the source is properly cited and Authors are acknowledged.
\n
\n\n
Crossref
\n\n
\n\t
Crossref is the official Digital Object Identifier (DOI) Registration Agency for scholarly and professional publications with a goal of making scholarly communications more effective. IntechOpen deposits metadata and registers DOIs for all content using the Crossref System. IntechOpen also deposits its references and uses the Crossref Cited-by service that enables researchers to track citation statistics.
\n
\n\n
Altmetric and Dimensions from Digital Science
\n\n
\n\t
Digital Science is a technology company serving the needs of scientific and research communities at key points along the full cycle of research. They support innovative businesses and technologies that make all parts of the research process more open, efficient and effective. IntechOpen integrates tools such as Altmetric to enable our researchers to track and measure the activity around their academic research and Dimensions, to ease access to the most relevant information and better understand and analyze the global research landscape.
\n
\n\n
CLOCKSS
\n\n
\n\t
CLOCKSS preserves scholarly publications in original formats, ensuring that they always remain available and openly accessible to everyone.
\n
\n\n
Counter
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\n\t
COUNTER provides the Code of Practice that enables publishers and vendors to report usage of their electronic resources in a consistent way. This enables libraries to compare data received from different publishers and vendors.
\n
\n\n
DORA
\n\n
\n\t
DORA is a worldwide initiative covering all scholarly disciplines which recognizes the need to improve the ways in which the outputs of scholarly research are evaluated and seeks to develop and promote best practice. To date it has been signed by over 1500 organizations and around 14,700 individuals.
\n
\n\n
iThenticate
\n\n
\n\t
iThenticate is the leading provider of professional plagiarism detection and prevention technology and is used worldwide by scholarly publishers and research institutions to ensure the originality of written work before publication. IntechOpen uses the iThenticate plagiarism software to ensure content originality and the research integrity of our published work.
\n
\n\n
Enago
\n\n
\n\t
IntechOpen collaborates with Enago, through its sister brand, Ulatus, one of the world’s leading providers of book translation services. Their services are designed to convey the essence of your work to readers from across the globe in the language they understand.
\n\t
IntechOpen Authors that wish to use this service will receive a 20% discount on all translation services. To find out more information or obtain a quote, please visit https://www.enago.com/intech
\n
\n\n
SPi Global
\n\n
\n\t
SPi Global is the market leader in technology-driven solutions for the extraction, enrichment and transformation of content assets. IntechOpen publishing services are designed to meet the unique needs of Authors. As part of our commitment to that objective, we have an ongoing partnership agreement for production solutions.
\n
\n\n
Amazon
\n\n
\n\t
Amazon is the world’s largest online retailer and cloud services provider. IntechOpen books have been available on Amazon since 2017, guaranteeing more visibility for our Authors and Academic Editors.
\n
\n\n
DHL
\n\n
\n\t
IntechOpen has partnered with DHL since 2011 to ensure the fastest delivery of Print on Demand books.
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