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Introductory Chapter: From Waste to New Resources

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Anca C. Fărcaş, Sonia A. Socaci and Zorita M. Diaconeasa

Submitted: 13 June 2019 Published: 12 November 2019

DOI: 10.5772/intechopen.89442

From the Edited Volume

Food Preservation and Waste Exploitation

Edited by Sonia A. Socaci, Anca C. F?rca?, Thierry Aussenac and Jean-Claude Laguerre

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1. Introduction

Food represents as one of the most basic human needs, providing our physical integrity. The entire planet is facing an alarming issue, regarding the amount of edible food and by-products, which are wasted in an increasingly manner. Moreover, food manufacturing requires resources such as soil and water and involves various processes, which generate huge amounts of food waste. As the production of food is resource-intensive, food losses and wastes are strongly correlated with a broad range of environmental problems, such as water and air pollution, soil erosion, and greenhouse gas emissions; all of these undesirable effects occur in all stages of production, storage, and transportation as well as in the case of adopting a deficient management system [1].

The generation of food waste is inevitable, especially during the pre-consumption stage. It is estimated that up to 42% of food waste is generated from household activities, 39% occur from the food manufacturing industry, and 14% occur from the food service sector (catering and restaurants), while 5% is lost during storage and distribution. This problem is intensified by the global population growth leading consequently to an increasing demand for natural resources like food and energy [2, 3].

Nowadays, the biggest challenge of the scientific world is to provide viable alternative models that combine food production with an efficient valorization strategy of waste and by-product, minimization of energy consumption, and environmental protection. In this context, the exploitation of food waste or by-products for the recovery of valuable functional compounds can be considered as being one of the most feasible approaches [4].

In order to implement a circular economy in any industrial sector, two main strategies are needed: reducing waste levels and finding the most sustainable solution to manage the remaining waste. In particular, the waste management of new strategies focus on the following actions: waste prevention, reuse, recycling, energy recovery, and, lastly, disposal [5].

Until a few decades ago, food waste was considered neither a cost nor a benefit being usually discarded to landfills, sent for composting, or used as animal feed. The negative perception on these by-products and implicitly the application of a deficient management lead to environmental degradation and especially to significant loss of valuable material that could otherwise be exploited as food, fuels, and a great variety of additives [6].

At present, the attitude has changed radically, the researches being intensely oriented toward the identification and extraction of valuable compounds from residues and their reintegration in the food industry but also in other fields such as cosmetics, pharmaceuticals, or agriculture (Figure 1).

Figure 1.

The main applications of bioactive compounds extracted from agri-food waste.

Using the recovered bioactive molecules as functional ingredients represents a sustainable alternative of food waste exploitation as an inexpensive source of valuable compounds while developing innovative food and nonfood products with health-promoting benefits and at the same time contributing to an efficient waste reduction management.

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2. Extraction technologies for bioactive compounds from food waste

Most of the wastes generated by the agri-food industries are difficult to store, transport, and process because of the biological instability, pathogenic potential, high levels of nutrients or enzyme activity, high water content, and the potential for self-oxidation.

The new aspects concerning the use of agri-food wastes as by-products for further exploitation in the production of various functional products must be environmentally friendly and sustainable from the economic point of view [7, 8, 9]. Therefore, it is imperative to identify the most feasible and optimized stabilization methods in order to ensure a flow of biomass with a constant composition and reduced storage and transport costs.

For this purpose, technological innovation has favored the development of many effective exploitation methods, with cogeneration of electricity and thermal biogas, also called green energy. In addition, the implementation of a biorefinery concept offers remarkable opportunities to valorize biomass by converting it to a wide range of chemicals with many applications in food, cosmetic, and pharmaceutical industries [10, 11].

The innovative approach of converting food waste in new generation of useful products involves the application of unconventional methods and advanced techniques in order to model the most appropriate and sustainable recovery system (Figure 2).

Figure 2.

A schematic representation of the most used conventional and novel techniques suitable for extracting biomolecules.

Nevertheless, the extraction protocols cannot be used indiscriminately, and their choice depends on the type of bioactive compounds and matrix structure, the processing scale (pilot or industrial level), the balance between processing costs and economic income of the recovered component, and their new assigned destinations [6].

In the last years, the researches focused on the development and optimization of the methods for the recovery and purifications of the functional compounds; some of them are based on new emerging techniques, but some are effective by applying and modeling the existing conventional method. In both situations, the extraction of the high-value components must be environmentally friendly and economically feasible to perform.

The applied parameters have a major impact on the release of the bioactive compounds from the matrix but also on their structure and functionality. Therefore, selecting the most suitable extraction protocol is a decisive step for the recovery of the valuable component [6, 9, 12].

Several examples of bioactive compounds recovered from food processing by-products and the selected extraction methods are presented in Table 1.

Recovered compoundsWaste sourceExtraction methodRef.
Polysaccharide/dietary fibersFruits pomace, sugar beet, sunflower headsSolid-liquid extraction[13]
Citrus peel and apple pomaceSubcritical water extraction[14]
Cereal by-productsEnzymatic treatment and sequential extraction[15]
Apple pomaceHot-compressed water[16]
Organic acids[17]
Olive mill wastewatersUltrafiltration and nanofiltration[18]
Rice branMicrowave treatment and microbial fermentation[19]
Phenolic compoundsApple pomaceMicrowave-assisted extraction[20]
Electric field-assisted extraction[21]
Tomato pomace and skinEnzymatic-assisted extraction/solvent extraction[22]
Potato peelsMicrowave-assisted extraction[23]
Olive cakeUltrasound-assisted extraction[24]
Avocado peel and seedsSolvent extraction[25]
Wheat beansUltrasound-assisted extraction[26]
Tea by-productsSupercritical fluid extraction; microwave-assisted extraction/solvent extraction[27, 28]
Bran and germsUltrasound-assisted extraction[29]
Grape by-productsUltrafiltration[30]
High-voltage electrical discharges and ultrafiltration[31]
Supercritical fluid extraction[32]
Solvent extraction/microwave-assisted extraction/ultrasound-assisted extraction[33]
Blueberry residueSupercritical fluid extraction and pressurized liquids[34]
Flax seedsSolid-liquid extraction[35]
CaffeineTea wasteMicrowave-assisted extraction/solvent extraction[28]
OilsRice branSupercritical carbon dioxide extraction and compressed liquefied petroleum gas/solid-liquid extraction[36, 37]
Essential oilsCitrus peelSolvent extraction/hydrodistillation[38]
Steam explosion at high temperature and pressure[39]
Microwave-assisted hydro-diffusion[40]
ProteinsBrewers’ spent grainSequential extraction of proteins and arabinoxylans; enzymatic-assisted extraction[15, 41]
Rice by-productsEnzymatic hydrolysis and membrane filtration technique[42]
Hazelnut mealSolvent extraction (water, acetone)[43]
Rapeseed by-productsUltrasound-assisted aqueous extraction[44]
CarotenoidsTomato pomace and skinEnzymatic-assisted extraction[45]
Supercritical fluid extraction/solvent extraction[46]
Supercritical fluid extraction[47]
Citrus peelUltrasound-assisted extraction[48]
Sea buckthorn seedsSupercritical carbon dioxide fluid extraction[49]
Proteins and bioactive peptidesWhey wastewaterMembrane separation/ultrafiltration/microfiltration/nanofiltration/reverse osmoses[50]
Mild enzymatic hydrolysis[51]
Cheese wheyUltrafiltration/nanofiltration[52]
Fish and chickenIsoelectric solubilization and precipitation[53]
Sardine solid wasteEnzymatic hydrolysis and ultrafiltration[54]
ShellfishEnzymatic hydrolysis and micro-, ultra-, and nanofiltration/ion exchange chromatography[55]
SugarsWhey wastewaterMembrane separation and spray drying[50]
Cheese wheyUltrafiltration/nanofiltration[52]

Table 1.

Examples of bioactive compounds from plant- and animal-derived by-products and the applied extraction techniques.

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3. Food preservation for minimizing food waste

Beside the possibilities mentioned before for the proper management of food waste and its valorization through the recovery of the bioactive compounds, we also need to consider the role of food preservation to reduce food waste. Following harvest, slaughter, or manufacture, all foods start to lose quality. The rate at which food quality is lost is dependent on food type, composition, the way it was processed, packed and storage conditions. On the other hand, the lost of quality and safety attributes of the foods may occur at any stage in the food chain generating food waste: raw material storage; product formulation; processing; packaging; storage in the factory; distribution to depots and storage; distribution to retail outlets; display in stores; sale to the consumer and further storage; preparation for consumption. Nonetheless, by applying conventional, highly advanced or hurdle preservation techniques (Figure 3), one can impede the chemical or microbiological deteriorations, thus preventing outbreaks of foodborne illness and at the same time limiting the food waste. As it is illustrated in Figure 3, in the food industry, beside the commonly used preservation techniques, a number of new ones are being developed to satisfy the current demands of economic preservation and consumer satisfaction in safety, nutritional and sensory aspects. Also, as the preservation of foods is often a multicomponent issue, the “hurdle” concept was introduced, highlighting the complex interaction between the factors that are significant for food safety and stability [56, 57, 58].

Figure 3.

A schematic representation of the most used conventional and novel techniques for foods preservation.

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4. Concluding remarks and future trends

The idea of converting the agri-food waste into functional ingredients is an area of research with huge potential and opportunities. Many researches in biotechnology have already shown that agri-food by-products are no longer regarded as a waste but rather a valuable substrate for producing a new range of useful compounds. Based on this, it is an undeniable fact that, through compatible biotechnological processes, every food processing by-product possesses a relevant potential for a sustainable reuse.

The recent findings, presented in the chapters of this book, highlighted the potential reuse of food industry by-products and led to the idea that multidisciplinary approaches should be implemented in order to achieve the most effective exploitation protocol or to develop integrated biorefineries

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Acknowledgments

This work was supported by three grants of Ministry of Research and Innovation, CNCS - UEFISCDI, project number PN-III-P1-1.1-PD-2016-0869, CNCS - UEFISCDI, project number PN-III-P1-1.1-TE-2016-0973 and CNCS-UEFISCDI Projects for Financing the Excellence in CDI, Contract no. 37PFE/06.11.2018.

References

  1. 1. Mourad M. Recycling, recovering and preventing food waste: Competing solutions for food systems sustainability in the United States and France. Journal of Cleaner Production. 2016;126:461-477
  2. 2. Ravindran R, Jaiswal AK. Exploitation of food industry waste for high-value products. Trends in Biotechnology. 2016;(34):58-69
  3. 3. Kumar K, Yadav A, Kumar V, Vyas P, Dhaliwal HS. Food waste: A potential bioresource for extraction of nutraceuticals and bioactive compounds. Bioresources and Bioprocessing. 2017;4:18
  4. 4. Socaci SA, Farcas AC, Galanakis CM. Introduction in functional components for membrane separations. In: Galankis C, editor. Separation of Functional Molecules in Food by Membrane Technology 2019. London, UK: Academic Press. pp. 31-77
  5. 5. Garcia-Garcia G, Stone J, Rahimifard S. Opportunities for waste valorisation in the food industry—A case study with four UK food manufacturers. Journal of Cleaner Production. 2019;211:1339-1356
  6. 6. Baiano A. Recovery of biomolecules from food wastes—A review. Molecules. 2014;19:14821-14842
  7. 7. Mathias TR, de Mello PM, Sérvulo EF. Solid wastes in brewing process: A review. Journal of Brewing and Distilling. 2014;5(1):1-9
  8. 8. Mussatto SI. Brewer’s spent grain: A valuable feedstock for industrial applications. Journal of the Science of Food and Agriculture. 2014;94(7):1264-1275
  9. 9. Farcas AC, Socaci SA, Mudura E, Dulf FV, Vodnar DC, Tofana M, et al. Exploitation of brewing industry wastes to produce functional ingredients. In: Kanauchi M, editor. Brewing Technology. Rijeka, Croatia: InTech; 2017. pp. 137-156
  10. 10. Otles S, Kartal C. Food waste valorisation. In: Galanakis C, editor. Sustainable Food Systems from Agriculture to Industry. Academic Press; 2018
  11. 11. Tsang YF, Kumar V, Samadar P, Yang Y, Lee J, Ok YS, et al. Production of bioplastic through food waste valorization. Environment International. 2019;127:625-644
  12. 12. Socaci SA, Farcas AC, Vodnar DC, Tofana M. Food wastes as valuable sources of bioactive molecules. In: Shiomi N, editor. Superfood and Functional Food—The Development of Superfoods and Their Roles as Medicine. Rijeka, Croatia: InTech; 2017. pp. 75-93
  13. 13. Waldron K. Handbook of Waste Management and Co-Product Recovery in Food Processing. Cambridge, UK: Woodhead Publishing; 2009
  14. 14. Wang X, Chen Q , Lü X. Pectin extracted from apple pomace and citrus peel by subcritical water. Food Hydrocolloids. 2014;38:129-137
  15. 15. Vieira E, Rocha MAM, Coelho E, Pinho O, Saraiva JA, Ferreira I, et al. Valuation of brewer’s spent grain using a fully recyclable integrated process for extraction of proteins and arabinoxylans. Industrial Crops and Products. 2014;52:136-143
  16. 16. Wang X, Lü X. Characterization of pectic polysaccharides extracted from apple pomace by hot-compressed water. Carbohydrate Polymers. 2014;102:174-184
  17. 17. Panchami PS, Gunasekaran S. Extraction and characterization of pectin from fruit waste. International Journal of Current Microbiology and Applied Sciences. 2017;6(8):943-948
  18. 18. Galanakis CM, Tornberg E, Gekas V. Clarification of high-added value products from olive mill wastewater. Journal of Food Engineering. 2010;99:190-197
  19. 19. Liu Q , Cao X, Zhuang X, Han W, Guo W, Xiong J, et al. Rice bran polysaccharides and oligosaccharides modified by Grifola frondosa fermentation: Antioxidant activities and effects on the production of NO. Food Chemistry. 2017;223:49-53
  20. 20. Chandrasekar V, San Martín-González MF, Hirst P, Ballard TS. Optimizing microwave-assisted extraction of phenolic antioxidants from Red delicious and Jonathan apple pomace. Journal of Food Process Engineering. 2015;38(6):571-582
  21. 21. Lohani UC, Mutukumarappan K, Meletharayl GH. Application of hydrodynamic cavitation to improve antioxidant activity in sorghum flour and apple pomace. Food and Bioproducts Processing. 2016;100(Part A):335-343
  22. 22. Azabou S, Abid Y, Sebii H, Felfoul I, Gargouri A, Attia H. Potential of the solid-state fermentation of tomato by products by Fusarium solani pisi for enzymatic extraction of lycopene. LWT-Food Science and Technology. 2016;68:280-287
  23. 23. Singh A, Sabally K, Kubow S, Donnelly DJ, Gariepy Y, Orsat V, et al. Microwave-assisted extraction of phenolic antioxidants from potato peels. Molecules. 2011;16:2218-2232
  24. 24. Mojerlou Z, Elhamirad A. Optimization of ultrasound-assisted extraction (UAE) of phenolic compounds from olive cake. Journal of Food Science and Technology. 2018;55(3):977-984
  25. 25. Deng GF, Shen C, Xu XR, Kuang RD, Guo YJ, Zeng LS, et al. Potential of fruit wastes as natural resources of bioactive compounds. International Journal of Molecular Sciences. 2012;13:8308-8323
  26. 26. Pasqualone A, Delvecchio LN, Gambacorta G, Laddomada B, Urso V, Mazzaglia A, et al. Effect of supplementation with wheat bran aqueous extracts obtained by ultrasound-assisted technologies on the sensory properties and the antioxidant activity of dry pasta. Natural Product Communications. 2015;10(10):1739-1742
  27. 27. Li J, Chase HA. Applications of membrane techniques for purification of natural products. Biotechnological Letters. 2010;32(5):601-608
  28. 28. Serdar G, Demir E, Sökmen M. Recycling of tea waste: Simple and effective separation of caffeine and catechins by microwave assisted extraction (MAE). International Journal of Secondary Metabolite. 2017;2:78-89
  29. 29. Wang J, Sun B, Cao Y, Tian Y, Li X. Optimisation of ultrasound-assisted extraction of phenolic compounds from wheat bran. Food Chemistry. 2008;106:804-810
  30. 30. Galanakis CM, Markouli E, Gekas V. Fractionation and recovery of different phenolic classes from winery sludge via membrane filtration. Separation and Purification Technology. 2013;107:245-251
  31. 31. Liu D, Vorobiev E, Savoire R, Lanoisellé JL. Intensification of polyphenols extraction from grape seeds by high voltage electrical discharges and extract concentration by dead-end ultrafiltration. Separation and Purification Technology. 2011;81:134-140
  32. 32. Casas L, Mantell C, Rodríguez M, de la Ossa EM, Roldán A, De Ory I, et al. Extraction of resveratrol from the pomace of Palomino fino grapes by supercritical carbon dioxide. Journal of Food Engineering. 2010;96:304-308
  33. 33. Drosou C, Kyriakopoulou K, Bimpilas A, Tsimogiannis D, Krokida M. A comparative study on different extraction techniques to recover red grape pomace polyphenols from vinification byproducts. Industrial Crops and Products. 2015;75:141-149
  34. 34. Paes J, Dotta R, Barbero GF, Martinez J. Extraction of phenolic compounds and anthocyanins from blueberry (Vaccinium myrtillus L.) residues using supercritical CO2 and pressurized liquids. Journal of Supercritical Fluids. 2014;95:8-16
  35. 35. Sainvitu P, Nott K, Richard G, Blecker C, Jérôme C, Wathelet JP, et al. Structure, properties and obtention routes of flaxseed lignan secoisolariciresinol: A review. Biotechnologie, Agronomie, Société et Environnement. 2012;16:115-124
  36. 36. Soares JF, Dal Prá V, de Souza M, Cavalheiro Lunelli F, Abaide E, da Silva JRF, et al. Extraction of rice bran oil using supercritical CO2 and compressed liquefied petroleum gas. Journal of Food Engineering. 2016;170:58-63
  37. 37. Javed F, Ahmad SW, Rehman A, Zafar S, Malik SR. Recovery of rice bran oil using solid-liquid extraction technique. Journal of Food Process Engineering. 2014;38(4):357-362
  38. 38. Thongnuanchan P, Benjakul S. Essential oils: Extraction, bioactivities, and their uses for food preservation. Journal of Food Science. 2014;79(7):1231-1249
  39. 39. Golmohammadi M, Borghei A, Zenouzi A, Ashrafi N, Taherzadeh MJ. Optimization of essential oil extraction from orange peels using steam explosion. Heliyon. 2018;4(11):e00893
  40. 40. Auta M, Musa U, Tsado DG, Faruq AA, Isah AG, Raji S, et al. Optimization of citrus peels D-limonene extraction using solvent-free microwave green technology. Chemical Engineering Communications. 2018;205(6):789-796
  41. 41. Niemi P, Martins D, Buchert J, Faulds CB. Pre-hydrolysis with carbohydrases facilitates the release of protein from brewer’s spent grain. Bioresource Technology. 2013;136:529-534
  42. 42. Ferry M, Graen-Heedfeld J, Bretz K, Guillon F, Michelini E, Calabretta MM, et al. Peptide fractions obtained from rice by-products by means of an environment-friendly process show in vitro health-related bioactivities. PLoS One. 2017;12(1):e0170954
  43. 43. Aydemir LY, Gökbulut AA, Baran Y, Yemenicioglu A. Bioactive, functional and edible film-forming properties of isolated hazelnut (Corylus avellana L.) meal proteins. Food Hydrocolloids. 2014;36:130-142
  44. 44. Yu X, Gouyo T, Grimi N, Bals O, Vorobiev E. Ultrasound enhanced aqueous extraction from rapeseed green biomass for polyphenol and protein valorization. Comptes Rendus Chimie. 2016;19:766-777
  45. 45. Kong KW, Khoo HE, Prasad KN, Ismail A, Tan CP, Rajab NF. Revealing the power of the natural red pigment lycopene. Molecules. 2010;15:959-987
  46. 46. Kehili M, Kammlott M, Choura S, Zammel A, Zetzl C, Smirnova I, et al. Supercritical CO2 extraction and antioxidant activity of lycopene and β-carotene-enriched oleoresin from tomato (Lycopersicum esculentum L.) peels by-product of a Tunisian industry. Food and Bioproducts Processing. 2017;102:340-349
  47. 47. Nobre BP, Palavra AF, Pessoa FL, Mendes RL. Supercritical CO2 extraction of trans-lycopene from Portuguese tomato industrial waste. Food Chemistry. 2009;116:680-685
  48. 48. Boukroufa M, Boutekedjiret C, Chemat F. Development of a green procedure of citrus fruits waste processing to recover carotenoids. Resource-Efficient Technologies. 2017;3:252-262
  49. 49. Kagliwal LD, Patil S, Pol A, Singhal R, Patravale V. Separation of bioactives from seabuckthorn seeds by supercritical carbon dioxide extraction methodology through solubility parameter approach. Separation and Purification Technology. 2011;80(3):533-540
  50. 50. Prazeres AR, Carvalho F, Rivas J. Cheese whey management: A review. Journal of Environmental Management. 2012;110:48-68
  51. 51. Muro Urista C, Álvarez Fernández R, Riera Rodriguez F, Arana Cuenca A, Téllez JA. Review: Production and functionality of active peptides from milk. Food Science and Technology International. 2011;17(4):293-317
  52. 52. Galanakis CM, Chasiotis S, Botsaris G, Gekas V. Separation and recovery of proteins and sugars from Halloumi cheese whey. Food Research International. 2014;65:477-483
  53. 53. Shi L, Beamer SK, Yin T, Matak KE, Yang H, Jaczynski J. Mass balance for isoelectric solubilization/precipitation of carp, chicken, menhaden, and krill. LWT—Food Science and Technology. 2017;81:26-34
  54. 54. Benhabiles MS, Abdi N, Drouiche N, Lounici H, Pauss A, Goosen MFA, et al. Fish protein hydrolysate production from sardine solid waste by crude pepsin enzymatic hydrolysis in a bioreactor coupled to an ultrafiltration unit. Materials Science and Engineering. 2012;32(4):922-928
  55. 55. Beaulieu L, Thibodeau J, Bonnet C, Bryl P, Carbonneau ME. Detection of antibacterial activity in an enzymatic hydrolysate fraction obtained from processing of Atlantic rock crab (Cancer irroratus) by-products. Pharma and Nutrition. 2013:149-157
  56. 56. Amit SK, Uddin MM, Rahman R, Islam R, Khanet MS. A review on mechanisms and commercial aspects of food preservation and processing. Agriculture and Food Security. 2017;6:51
  57. 57. Shajil S, Mary A, Rani Juneius CE. Recent food preservation techniques employed in the food industry. In: Patra J, Das G, Shin HS, editors. Microbial Biotechnology. Springer; 2018
  58. 58. Prokopov T, Tanchev S. Methods of food preservation. In: McElhatton A, Marshall RJ, editors. Food Safety a Practical and Case Study Approach. Springer; 2007

Written By

Anca C. Fărcaş, Sonia A. Socaci and Zorita M. Diaconeasa

Submitted: 13 June 2019 Published: 12 November 2019