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\r\n\tAt the same time, predicting and designing smarter, sustainable, resilient and livable cities is the desire of many governments and policy makers all over the world. However, there is not enough discussion around connecting the concept of smart and the concepts of desirable future cities including ‘sustainability, resilience and livability’. The concept “smart” can address intelligent transport systems for modelling and simulation, autonomous urban mobility, smart infrastructure, urban mobility, urban farms and sponge cities concepts. This book intends to provide an overview of emerging trends such as machine learning, artificial intelligence, internet of things and automation incorporated into powerful systems including online GIS to make a smarter, more sustainable, livable and resilient city.
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Meléndez-Díaz",authors:[{id:"105547",title:"Dr.",name:"Carlos",middleName:null,surname:"Ramos-Scharron",fullName:"Carlos Ramos-Scharron",slug:"carlos-ramos-scharron"},{id:"108403",title:"Dr.",name:"Edwin",middleName:null,surname:"Hernandez- Delgado",fullName:"Edwin Hernandez- Delgado",slug:"edwin-hernandez-delgado"},{id:"118359",title:"BSc.",name:"Mary Ann",middleName:null,surname:"Lucking",fullName:"Mary Ann Lucking",slug:"mary-ann-lucking"},{id:"118360",title:"Mr.",name:"Ricardo",middleName:null,surname:"Laureano",fullName:"Ricardo Laureano",slug:"ricardo-laureano"},{id:"151525",title:"MSc.",name:"Carmen",middleName:null,surname:"Guerrero-Perez",fullName:"Carmen Guerrero-Perez",slug:"carmen-guerrero-perez"},{id:"151526",title:"Dr.",name:"Pablo",middleName:null,surname:"Mendez-Lazaro",fullName:"Pablo Mendez-Lazaro",slug:"pablo-mendez-lazaro"}]},{id:"35535",title:"Nautical Tourism and Its Function in the Economic Development of Europe",slug:"nautical-tourism-in-the-function-of-the-economic-development-of-europe",totalDownloads:5356,totalCrossrefCites:4,signatures:"Tihomir Luković",authors:[{id:"115398",title:"Dr.",name:"Tihomir",middleName:null,surname:"Lukovic",fullName:"Tihomir Lukovic",slug:"tihomir-lukovic"}]},{id:"35536",title:"Sustainability in the Management of World Cultural Heritage",slug:"sustainability-in-the-management-of-world-cultural-heritage",totalDownloads:2688,totalCrossrefCites:0,signatures:"Devi Roza Kausar",authors:[{id:"114864",title:"Dr.",name:"Devi",middleName:null,surname:"Kausar",fullName:"Devi Kausar",slug:"devi-kausar"}]},{id:"35537",title:"Tourism in Rural Areas: Foundation, Quality and Experience",slug:"tourism-in-rural-areas-foundation-quality-and-experience",totalDownloads:3508,totalCrossrefCites:0,signatures:"Sandra Maria Correia Loureiro",authors:[{id:"112943",title:"Prof.",name:"Sandra",middleName:"Maria Correia",surname:"Loureiro",fullName:"Sandra Loureiro",slug:"sandra-loureiro"}]},{id:"35538",title:"Islands and Tourism Development: A Viewpoint of Tourism Stakeholders of Lesvos Island",slug:"islands-and-tourism-development-a-viewpoint-of-tourism-stakeholders-of-lesvos-island-greece",totalDownloads:3257,totalCrossrefCites:0,signatures:"Kostas Rontos, Eleni Kitrinou, Dimitrios Lagos and Mihail Diakomihalis",authors:[{id:"111311",title:"Prof.",name:"Kostas",middleName:null,surname:"Rontos",fullName:"Kostas Rontos",slug:"kostas-rontos"},{id:"111729",title:"Prof.",name:"Mihail",middleName:null,surname:"Diakomihalis",fullName:"Mihail Diakomihalis",slug:"mihail-diakomihalis"},{id:"117320",title:"Dr.",name:"Eleni",middleName:null,surname:"Kitrinou",fullName:"Eleni Kitrinou",slug:"eleni-kitrinou"},{id:"117322",title:"Prof.",name:"Dimitrios",middleName:null,surname:"Lagos",fullName:"Dimitrios Lagos",slug:"dimitrios-lagos"}]}]},relatedBooks:[{type:"book",id:"2298",title:"Strategies for Tourism Industry",subtitle:"Micro and Macro Perspectives",isOpenForSubmission:!1,hash:"756704471c1209186b420f9985bd4fa6",slug:"strategies-for-tourism-industry-micro-and-macro-perspectives",bookSignature:"Murat Kasimoglu and Handan Aydin",coverURL:"https://cdn.intechopen.com/books/images_new/2298.jpg",editedByType:"Edited by",editors:[{id:"115863",title:"Dr.",name:"Murat",surname:"Kasimoglu",slug:"murat-kasimoglu",fullName:"Murat Kasimoglu"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"},chapters:[{id:"35706",title:"Guidebooks and the Representation of 'Other' Places",slug:"guidebooks-and-the-representation-of-other-places",signatures:"Bouke van Gorp",authors:[{id:"117128",title:"Dr.",name:"Bouke",middleName:null,surname:"Van Gorp",fullName:"Bouke Van Gorp",slug:"bouke-van-gorp"}]},{id:"35707",title:"The Dynamics of Temporary Jobs in the Tourism Industry",slug:"working-career-progress-in-the-tourism-industry-temp-to-perm-transitions-in-spain",signatures:"Fernando Muñoz-Bullón",authors:[{id:"116611",title:"Prof.",name:"Fernando",middleName:null,surname:"Munoz-Bullon",fullName:"Fernando Munoz-Bullon",slug:"fernando-munoz-bullon"}]},{id:"35708",title:"The Importance of Hypertext in the Tourist Destination Choice from Web Sites",slug:"the-importance-of-hypertext-in-the-tourist-destination-choice-from-web-sites",signatures:"Raúl Valdez M. Ph.D",authors:[{id:"111279",title:"Dr.",name:"Raul",middleName:null,surname:"Valdez",fullName:"Raul Valdez",slug:"raul-valdez"}]},{id:"35709",title:"Sustainable Tourism in Aragon, a Case of a Spanish Inside Region",slug:"sustainable-tourism-in-aragon-a-case-of-a-spanish-inside-region-",signatures:"Victoria Sanagustin Fons, Jose Antonio Mosene Fierro, Maria Gomez y Patino and Laura Arena Luna",authors:[{id:"114739",title:"Prof.",name:"Jose Antonio",middleName:null,surname:"Moseñe",fullName:"Jose Antonio Moseñe",slug:"jose-antonio-mosene"},{id:"150433",title:"Dr.",name:"Mª Victoria",middleName:null,surname:"Sanagustin",fullName:"Mª Victoria Sanagustin",slug:"ma-victoria-sanagustin"},{id:"150434",title:"Dr.",name:"Maria",middleName:null,surname:"Gomez",fullName:"Maria Gomez",slug:"maria-gomez"},{id:"150435",title:"Mrs.",name:"Laura",middleName:"Fani",surname:"Arena Luna",fullName:"Laura Arena Luna",slug:"laura-arena-luna"}]},{id:"35710",title:"A Model for Assessing the Level of Tourism Impacts and Sustainability of Coastal Cities",slug:"a-model-for-assessing-the-level-of-tourism-impacts-and-sustainability-of-coastal-cities",signatures:"Beser Oktay Vehbi",authors:[{id:"117933",title:"Dr.",name:"Beser",middleName:null,surname:"Oktay Vehbi",fullName:"Beser Oktay Vehbi",slug:"beser-oktay-vehbi"}]},{id:"35711",title:"Introduction to Tourism Satellite Accounts",slug:"tourism-satellite-accounts-as-a-de-jure-universal-tool-for-measurement-of-tourism-as-an-industry",signatures:"Tadayuki (Tad) Hara",authors:[{id:"111309",title:"Dr.",name:"Tadayuki",middleName:null,surname:"Hara",fullName:"Tadayuki Hara",slug:"tadayuki-hara"}]},{id:"35712",title:"What Women Want: Hotel Characteristics Preferences of Women Travellers",slug:"what-women-want-hotel-characteristics-preferences-of-women-travellers",signatures:"Azizan Marzuki, Tan Lay Chin and Arman Abdul Razak",authors:[{id:"111261",title:"Associate Prof.",name:"Azizan",middleName:null,surname:"Marzuki",fullName:"Azizan Marzuki",slug:"azizan-marzuki"},{id:"118609",title:"Ms.",name:"Lay Chin",middleName:null,surname:"Tan",fullName:"Lay Chin Tan",slug:"lay-chin-tan"},{id:"118610",title:"Mr.",name:"Arman",middleName:null,surname:"Abdul Razak",fullName:"Arman Abdul Razak",slug:"arman-abdul-razak"}]},{id:"35713",title:"New Challenges for Tourism Destination Management in Romania",slug:"new-challenges-for-tourism-destination-management-in-romania",signatures:"Gabriela Tigu",authors:[{id:"119493",title:"Dr.",name:"Gabriela",middleName:null,surname:"Tigu",fullName:"Gabriela Tigu",slug:"gabriela-tigu"}]},{id:"35714",title:"Value Creation in Experience-Based Networks: A Case Study of Sport-Events in Europe",slug:"value-creation-in-experience-based-networks-a-case-study-of-sport-events-in-europe",signatures:"Nina Katrine Prebensen",authors:[{id:"115904",title:"Prof.",name:"Nina Katrine",middleName:null,surname:"Prebensen",fullName:"Nina Katrine Prebensen",slug:"nina-katrine-prebensen"}]},{id:"35715",title:"The Role and Importance of Cultural Tourism in Modern Tourism Industry",slug:"the-role-and-importance-of-cultural-tourism-in-modern-tourism-industry",signatures:"Janos Csapo",authors:[{id:"118766",title:"Dr.",name:"János",middleName:null,surname:"Csapó",fullName:"János Csapó",slug:"janos-csapo"}]},{id:"35716",title:"World Heritage Listing and Implications for Tourism - 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Bamboo species have been known and used by human kind since the beginning of civilization; its use as building materials can be traced back to the pre-ceramic period 9500 years ago, while relics from bamboo mats and baskets were dated at 3300-2800 BC [1]. In Asian countries, their leaves are used as a food wrapping material to prevent food deterioration since ancient times, besides using the culms as a construction material. In this region, bamboo leaves are described in the traditional medicine for treating hypertension, arteriosclerosis, cardiovascular disease, and certain forms of cancer. These therapeutic properties are most likely mediated by their antioxidant capacity.
These plants form a large subfamily of the grasses (Poaceae: Bambusoideae), comprising about 1662 species distributed in 121 genera. Bamboos present a large range of functional forms found over numerous biogeographic regions, including dwarf herbaceous species in temperate climates and giant tropical woody species that can reach up to 20 m height [2]. These species can adapt and propagate in inhospitable environments, such as humid and cold mountain tops as well as the ones dry and warm [3], naturally occurring in all continents except Europe [4]. Bamboos play an important role in South American forest diversity. Brazil is the country with the greatest number of native bamboo species in the New World [5]. This means that 89% of the genera and 65% of known bamboo species (36 genera and 254 species) are distributed among the Atlantic Forest, the Cerrado, and the Amazon [6].
Bamboos have a large ecological amplitude in response to canopy disturbances and can become super dominant species after opening in natural or anthropic origin. In addition, they have a very rapid growth from the stem base to the top of the plant [7]. Currently, bamboo species are considered as one of the most available forest resources. In tropical and subtropical areas, bamboos represent approximately 20–25% of the total biomass, which contributes to their status as one of the most important renewable resources [8]. Considered a rapid atmospheric carbon sink, bamboo has also physical and mechanical properties that make it suitable to be used in the development of products normally produced with native wood or from reforestation, such as construction components, furniture industry, cables for agricultural tools, panels, and plates, among others.
Bamboo species share some common characteristics of their phenolic composition with other grasses. They contain several glycosylated flavones whose aglycones are represented by apigenin, luteolin, and tricin [9, 10, 11]. This is also the case in, for example, durum wheat (Triticum durum) [12] and barley (Hordeum vulgare) [13]. Just as in other grass species, such as corn, wheat, and rice [14], most glycosides are conjugated via a C-linkage to the flavone aglycone. In China, their phenolic compounds are used to make a preparation, called antioxidant of bamboo leaves (AOB), to be applied as food antioxidant whose use is sanctioned by the local Health Ministry. The AOB is composed mainly by flavonoids, lactones, and phenolic acids. The main flavonoids found in AOB are the flavone C-glycosides such as orientin, homoorientin, vitexin, and isovitexin [15].
The production of reactive oxygen species (ROS) is a result of normal cell metabolism; however, once the oxidative processes start to be predominant over the antioxidant, the imbalance called “oxidative stress” can be harmful to human body [16]. Oxygen’s reactivity, which is under normal conditions, permits the high-energy electron transfer allowing the formation of big quantities of adenosine-5-triphosphate (ATP) by the oxidative phosphorylation and jeopardizes the cells of living organisms by attacking molecules such as proteins, lipids, or DNA [17]. Free radicals created in this process cause various genetic changes causing cancer, cardiovascular and neurological diseases, nephropathy, rheumatoid arthritis, and other disorders [18]. Plants provide an abundant source of the substances with biological activity. In case of antioxidant protection, flavonoids stand for one of the most efficient molecules combating the oxidative stress.
There are two terms describing the antioxidant efficacy: “antioxidant activity” and “antioxidant capacity,” and they have different meanings. The prior expresses the kinetics of a reaction between an antioxidant and the prooxidant or radical scavenging activity, and the latter one measures the thermodynamic conversion efficiency of the reaction. The analytical methods to evaluate antioxidant activity may be divided into electron transfer (ET)-based and hydrogen atom transfer (HAT)-based methods. ET-based methods utilize the process of the reduction in the oxidative component by the antioxidant, which leads to the change in color that can be observed [19]. Within this group, we can specify: DPPH (2,2-di(4-tert-octylphenyl)-1-picrylhydrazyl) method, ABTS (2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid), FRAP (ferric reducing antioxidant power), and CUPRAC (cupric reducing antioxidant capacity). HAT-based assays include for instance oxygen radical absorbance capacity (ORAC) reaction, detectable by the fluorescence loss of fluorescein. More “functional” analyses count the number of lipid oxidation products like thiobarbituric acid-reactive substances (TBARS) or evaluate a desired health effect of the product [19, 20].
The majority researchers working with bamboo-derived products use DPPH, ABTS, and FRAP methods or the combination of those to evaluate the antioxidant effect of their samples, when ORAC is less common. Values are expressed in the percentage of the radical inhibition, IC50, which is an inhibitory concentration (concentration needed to deactivate 50% of the radical formation) or Trolox equivalents. Table 1 demonstrates the results grouped by the method and unit used by the authors, and Table 2 shows IC50 against DPPH of the compounds isolated from the bamboo species.
Bamboo species | Sample | DPPH | ABTS | FRAP | ORAC | Ref. |
---|---|---|---|---|---|---|
Phyllostachys heterocycla cv. pubescens | Essential oil | 2.85* | [21] | |||
P. heterocycla cv. gracilis | Essential oil | 4.44* | ||||
P. heterocycla cv. heterocycla | Essential oil | 3.82* | ||||
P. kwangsiensis | Essential oil | 4.93* | ||||
Merostachys pluriflora Munro ex. C. G. Camus | Leaf ethanol | 119.51 | 25.65 | 92.08 | 5.79 | [22] |
Leaf hydromethanolic | 137.37 | 16.30 | 85.73 | 6.18 | ||
Leaf ethyl acetate | 117.68 | 19.66 | 51.88 | 2.73 | ||
Leaf dichloromethane | 190.73 | 37.21 | 89.69 | 6.05 | ||
Culm ethanol | 181.92 | 39.51 | 62.02 | 4.20 | ||
Culm hydromethanolic | 413.80 | 47.22 | 108.50 | 9.33 | ||
Culm ethyl acetate | 244.85 | 33.25 | 51.22 | 3.47 | ||
Culm dichloromethane | — | 60.69 | 27.92 | 1.22 | ||
Culm hexane | 296.94 | 94.77 | 145.80 | 9.10 | ||
P. pubescens (Pradelle) Mazel ex J. Houz | Leaf ethanol | — | [23] | |||
Branch ethanol | 350.60 | |||||
Inner culm at 1 m height ethanol | 373.80 | |||||
Inner culm at 5 m height ethanol | 88.50 | |||||
Rhizome ethanol | 171.50 | |||||
Leaf water | 306.70 | |||||
Branch water | 179.50 | |||||
Inner culm at 1 m height water | 231.90 | |||||
Inner culm at 5 m height water | 198.30 | |||||
Rhizome water | 266.70 | |||||
Shoot methanol | 3600.00 | [24] | ||||
Shoot chloroform | 4000.00 | |||||
Shoot ethyl acetate | 800.00 | |||||
Shoot butanolic | 700.00 | |||||
Shoot water | 4700.00 | |||||
Pseudosasa amabilis McClure | Essential oil | 5.29* | [25] | |||
Pleioblastus gramineus (Bean) Nakai | Essential oil | 6.50* | ||||
P. vivax f. aureocaulis N.X.Ma. | Essential oil | 7.53* | ||||
Indocalamus latifolius (Keng) McClure | Essential oil | 4.99* | ||||
P. nigra (Lodd. ex Lindl.) Munro | Shoot methanol | 3400.00 | [24] | |||
Shoot Chloroform | 2300.00 | |||||
Shoot ethyl acetate | 400.00 | |||||
Shoot butanolic | 800.00 | |||||
Shoot water | 5300.00 | |||||
Sasa borealis (Hack.) Makino and Shibata | Leaf butanolic | 51.00 | [9] |
Antioxidant activity of different bamboo species.
Values recalculated from μL/mL to μg/mL, assuming that the density of an essential oil is approximately 0.9 g/mL.
ABTS—scavenging ABTS(2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) cation radical effect; DPPH—scavenging DPPH (2,2-di(4-tert-octylphenyl)-1-picrylhydrazyl)radical effect; FRAP—ferric reducing antioxidant power; all the values in the table are the—IC50 [μg/mL]—inhibitory concentration, concentration needed to diminish the production the radical/oxidized product by 50%; ORAC—oxygen radical absorbance capacity.
Bamboo species | Part of the plant | Isolated compound | DPPH (IC50) | Reference |
---|---|---|---|---|
Sasa borealis (Hack.) Makino and Shibata | Leaves | Isoorientin | 9.5 | [9] |
Isoorientin 2-O-α- | 34.5 | |||
Apigenin 6-C-β- | 161.5 | |||
Phyllostachys edulis (Carrière) J. Houz. | Leaves | 3-O-(3′-methylcaffeoyl) quinic acid | 16.00 | [26] |
5-O-caffeoyl-4-methylquinic acid | 8.8 | |||
3-O-caffeoyl-1-methylquinic acid | 6.9 |
Antioxidant activity of isolated compounds of bamboos.
DPPH—scavenging DPPH (2,2-di(4-tert-octylphenyl)-1-picrylhydrazyl) radical effect; IC50—inhibitory concentration, concentration needed to diminish the production of DPPH radical by 50% [μM].
The most popular method (also as per the number of results included in Table 1) is the certainty DPPH radical scavenging test. IC50 is a unit that is easy to compare because it gives an idea of the concentration, which is necessary to decrease the radical formation by 50%. The values obtained for different species of bamboo varied between 51 μg/mL for Sasa borealis (leaf butanolic fraction) [9] and 5300 μg/mL for Phyllostachys nigra (shoot water fraction) [24]. The highest antiradicalar activity was obtained in case of butanol, ethyl acetate, and ethanol fractions. Although leaf extracts seemed to be the part of the plant that provides reasonably good results, essential oils were efficient in much smaller concentrations. The essential oil from Phyllostachys heterocycla cv. pubescens had IC50 of only 2.85 μg/mL (value recalculated from μL/mL for comparison purposes if the density of an essential oil is approximately 0.9 g/mL) as reported by Jin et al. [21]. The worst in the group, but still with high activity, was an essential oil from Phyllostachys vivax f. aureocaulis
Two from the chosen authors [10, 26] described the results for two Asian bamboo species: Phyllostachys nigra v. henonis and Phyllostachys edulis in the percentage of DPPH inhibition. The 20 μg/mL ethanol extract from the first species managed to suppress 40.9% of the radical formation, whereas the second one, depending on the fraction, was able to decrease it from 30.4 to 79.1% (chloroform and butanol fractions, respectively) in the concentration of 100 μg/mL. Both authors investigated in parallel the influence of the bamboo samples on lipid peroxidation. It was confirmed that the P. nigra scavenging effect reduced the rate of liposome peroxidation and human LDL (low-density lipoprotein) oxidation suppressing DNA modifications [10]. 3-O-caffeoyl-1-methylquinic acid (shown in Table 2), isolated from P. edulis, exhibited 36% of the inhibition of superoxide generation in human promyelocytic leukemia HL-60 cells [26].
The results expressed in IC50 for the DPPH and other methods such as ABTS, FRAP, and ORAC varied due to different mechanisms of action between prooxidant and antioxidant molecules. An ethyl acetate fraction from a Brazilian bamboo, Merostachys pluriflora, defined as the most active fraction from this species against DPPH (IC50 = 117.68 μg/mL), the second most active against ABTS cation radical (IC50 = 19.66 μg/mL) was also quite potent ferric reducing (IC50 = 51.88 μg/mL) and oxygen radical scavenging (IC50 = 2.73 μg/mL) agent. On the other hand, dichloromethane culm fraction from the same plant, not so active against DPPH nor ABTS, reduced almost two times more the ferric cation in the FRAP method than the previous sample (IC50 = 27.92 μg/mL) and was an excellent scavenger of the oxygen radical in ORAC assay (IC50 = 1.22 μg/mL) [22]. No direct correlation between the results assessed by ABTS and ORAC was also found in another study, evaluating the antioxidant activity of different parts of P. pubescens [23].
Trolox equivalents received by two methods: DPPH and FRAP were also compared, and it was found that in case of P. heterocycla cv. pubescens, gracilis, Tao Kiang, and P. aureosulcata, leaf and shoots in both evaluations were very similar to the TE content. Additionally, the extract that was the richest in TE in DPPH assay (P. heterocycla leaf) had also the highest value of it in the FRAP method [27]. As per this author, the shoots of bamboo were the part of the plant with the poorest antioxidant activity.
In general, bamboos were classified as good antioxidants, which can be related to their high flavonoid and phenol contents [27]. The scavenging activity against superoxide anion and hydroxyl radical of some methanol and hot water extracts from a bamboo powder, used in Japan for different purposes, was higher than the ones received for the control—α-tocoferol and ascorbic acid [28]. A polysaccharide-rich extract from Bambusa rutila had hydroxyl radical scavenging activity equal to vitamin C [29], where an isoorientin and its ester, derived from a Chinese product called antioxidant of bamboo leaves (AOB), had their IC50 lower than vitamin E [30]. The acylation of isoorientin was performed to improve its solubility in lipidic media, however, the process did not have a positive impact on the antioxidant activity of the substance. A nutritional formulation developed from bamboo vinegar (5%) and maltodextrin (30%) had better in vitro antioxidant effect that tested commercial beverages [31]. In other study, it was proved that bamboo oil from P. bambusoides, when incubated for 20 h, had its linoleic acid scavenging rate similar to that of ascorbic acid [32].
Few studies of the functional antioxidant activity with correlated health effect were described in the literature as well. The lignophenol derivatives obtained from a wood mixture containing bamboo P. bambusoides demonstrated neuroprotective activity in cells influenced by hydrogen peroxide-induced apoptosis [33]. A short-term assay established that both Asp-Tyr identified and isolated from P. pubescens shoot fractions diminished significantly the systolic blood pressure of spontaneously hypertensive rats [34]. An extract from Sasa senanensis, named Absolutely Hemicellulose Senanensis (AHSS), had determined its in vivo activity, and it was shown that it inhibited the production of lipid peroxide by intestinal ischemia and subsequent reperfusion (I/R) injury model in rats [35].
Quality and safety of various products can be affected by the presence of microorganisms; therefore, antimicrobial substances are widely used in cosmetic, food, and pharmaceutical industries. In cosmetics, preservatives protect the formulation during the production and the use by the consumers [36]. In the food industry, these additives can improve organoleptic characteristics of food, such as color, smell, and taste, in addition to the protection of food during production, storage, and consumption [37]. The growing microbial resistance to existing drugs has generated the need for the pharmaceutical industry to search for new molecules that can be used as preservatives, antibiotics, and disinfectants [38]. This factor associated with the toxicity of certain additives [39] and the consumer appeals for the reduction in synthetic substances [40], encourage the search for alternative solutions. The complexity and molecular diversity of natural products make them an interesting source of new molecules [41].
The antimicrobial capacity of bamboo species was evaluated through several methodologies, resulting in different units for the presentation of the results. In Table 3, results are shown as minimal inhibitory concentration (MIC), which is the lowest concentration that is able to completely inhibit microbial growth.
Bamboo species | Product | Microorganism | MIC (μg/mL) | Ref. |
---|---|---|---|---|
P. heterocycla var. pubescens (Pradelle) Ohwi | 2,6-Dimethoxy-p-benzoquinone | Escherichia coli | 400 | [42] |
Bacillus subtilis | 200 | |||
Salmonella typhimurium | 400 | |||
Sarcina lutea | 400 | |||
Pseudomonas aeruginosa | 800 | |||
Staphylococcus aureus | 200 | |||
Candida albicans | 800 | [43] | ||
Saccharomyces cerevisiae | 25 | |||
10 | ||||
25 | ||||
800 | ||||
Aspergillus niger | 800 | |||
Chloroform/methanol extract (bark) | Escherichia coli | 10,000 | [44] | |
Bacillus subtilis | 5000 | |||
Salmonella typhimurium | 10,000 | |||
Sarcina lutea | 10,000 | |||
P. heterocycla var. pubescens (Pradelle) Ohwi | Chloroform/methanol extract (bark) | Pseudomonas aeruginosa | 50,000 | [44] |
Staphylococcus aureus | 2000 | |||
Essential oil | Escherichia coli | 31.76* | [21] | |
Staphylococcus aureus | 31.76* | |||
P. pubescens (Pradelle) Mazel ex J. Houz. | Ethanol extract (outer culm) | Staphylococcus aureus | 400 | [23] |
P. pubescens (Pradelle) Mazel ex J. Houz. | Hot water extract (leaf) | Staphylococcus aureus | 1200 | [23] |
Hot water extract (branch) | Staphylococcus aureus | 1400 | ||
Hot water extract (inner culm) | Staphylococcus aureus | >16,000 | ||
P. kwangsiensis W.Y. Hsiung, Q.H. Dai and J.K. Liu | Essential oil | Escherichia coli | 31.76* | [21] |
Staphylococcus aureus | 22.23* | |||
P. heterocycla fo. gracilis (W.Y. Hsiung ex Houz.) T.P. Yi | Essential oil | Escherichia coli | 31.76* | |
Staphylococcus aureus | 22.23* | |||
P. heterocycla (Carrière) Mitford cv heterocycla | Essential oil | Escherichia coli | 31.76* | |
Staphylococcus aureus | 45.24* |
Antimicrobial activity of bamboo extracts—MIC.
Concentration calculated considering the density value 0.9.
The lower the MIC values, the more potent the substance is. To be considered as promising antimicrobial agents, natural products must have MICs below 100 μg/mL [39]. Therefore, the essential oils of Phyllostachys kwangsiensis, P. heterocycla cv. gracilis, and P. heterocycla cv. Heterocycla are the most active extracts, with MIC values ranging from 22.23 to 45.24 μg/mL for S. aureus and 31.76 μg/mL for E coli. 2,6-Dimethoxy-p-benzoquinone presented lower values than the essential oils; however, it is an isolated compound and not an extract. It is possible to affirm that the essential oils evaluated have an intense antimicrobial activity because their MIC values are close to those of an isolated compound.
In Table 4, the species were evaluated using the disk diffusion method. Three different extracts of each species were compared. All of them presented similar inhibition zones, around 7 mm. The wider inhibition zones were presented by the ethanolic extract of Bambusa blumeana against E. coli (9.8 mm) and Bambusa vulgaris hot water extract (10.7 mm) against S. aureus. However, all the extracts can be considered inactive, comparing them with the inhibition zones in Table 5. It is important to say that during the measurement of the diameter of the inhibition zones, the diameter of the disk is considered.
Bamboo species | Product | Inhibition zone (mm) | Ref. | |
---|---|---|---|---|
E. coli | S. aureus | |||
B. blumeana var. luzonensis Hack. | Acetone extract | 7.2 | 9.3 | [44] |
Ethanol extract | 7.6 | 7.2 | ||
Hot water extract | 7.4 | 7.4 | ||
B. blumeana Schult. and Schult. f. | Acetone extract | 6.6 | 7.0 | |
Ethanol extract | 9.8 | 9.3 | ||
Hot water extract | 7.3 | 7.3 | ||
B. vulgaris Schrad. | Acetone extract | 7.5 | 6.9 | |
Ethanol extract | 7.5 | 7.8 | ||
Hot water extract | 7.2 | 10.7 |
Antimicrobial activity of bamboo extracts—inhibition zone.
Symbol | Diameter (mm) | Classification |
---|---|---|
− | <10 | No activity |
+ | 10–15 | Activity |
++ | 15–20 | Good activity |
+++ | >20 | Very good activity |
Interpretation of inhibition zones [47].
The search for bioactive compounds is not limited only to the compounds produced by a plant species. Microorganisms hosted in plant tissues and organs have become a new source of useful metabolites for the pharmaceutical, agricultural, and food industries [45, 46]. Found in various parts of plants (roots, stems, leaves, and barks), endophytic fungi colonize various species [47], and the relationship between the endophytic fungi and the host plant may be advantageous since many of them improve the growth and protect the plant against pathogens [46].
Using the agar diffusion method, some authors evaluated the antimicrobial activity of fungal strains isolated from bamboos. The antimicrobial potential of the strains was evaluated against human pathogens, and in Table 6, it is possible to find the main results. Isolate 130 from P. edulis culms and isolate B38 from the same species presented similar results, with activity ranging from good to very good for most pathogens evaluated. Nevertheless, the isolate FB16 from P. edulis presented the best result, with very good activity against a larger number of microorganisms.
Bamboo species | Isolate no. | S. aureus | B. subtilis | L. monocytogenes | S. bacteria | E. coli | P. vulgaris | C. albicans | R. rubra | Ref. |
---|---|---|---|---|---|---|---|---|---|---|
P. edulis (Carrière) J. Houz. (Culms) | 106 | + | + | − | − | NT | NT | ++ | − | [45] |
120 | +++ | +++ | + | − | NT | NT | +++ | ++ | ||
127 | − | + | + | + | NT | NT | + | − | ||
128 | + | + | − | − | NT | NT | + | + | ||
130 | +++ | +++ | ++ | ++ | NT | NT | +++ | + | ||
P. edulis (Carrière) J. Houz.(Seeds) | B09 | + | + | − | − | NT | NT | ++ | − | [47] |
B34 | − | + | + | + | NT | NT | + | − | ||
B35 | + | + | − | − | NT | NT | + | + | ||
B38 | +++ | +++ | ++ | ++ | NT | NT | +++ | + | ||
ZZZ816 | +++ | +++ | + | − | NT | NT | +++ | + | ||
P. heteroclada Oliv. | FB16 | NT | +++ | +++ | +++ | +++ | ++ | +++ | NT | [46] |
FB43 | NT | − | ++ | ++ | + | + | − | NT | ||
FB06 | NT | ++ | ++ | − | + | − | + | NT | ||
FB21 | NT | − | ++ | ++ | + | + | ++ | NT |
Antimicrobial activity of fungal isolates.
NT—not tested.
One of the studies also evaluated the activity of fermentation products of fungal strains of P. edulis, and the results can be seen in Table 7. The product FB16 is the most active, with the biggest zones of inhibition. This behavior agrees with the results presented by the isolated fungus, as shown in Table 6. It is important to note that although the fermentation product FB16 presented the best result among the samples, its zones of inhibition are smaller than those presented by the isolated fungus.
Isolate no. | Inhibition zone (mm) | Ref. | |||||
---|---|---|---|---|---|---|---|
B. subtilis | L. monocytogenes | S. bacteria | E. coli | P. vulgaris | C. albicans | ||
FB16 | 13.2 | 11.8 | 10.29 | 12.46 | 8.8 | 16 | [46] |
FB43 | — | 10.6 | 8.95 | 7.6 | 7.52 | — | |
FB06 | 8.66 | 9.1 | — | 7.84 | — | 7.66 | |
FB21 | — | 8.7 | 8.64 | 7.52 | 7.77 | 8.69 |
Antimicrobial activity of fermentation products of fungal isolates from Phyllostachys heteroclada.
—: not active.
Despite the search for new substances with the ability to inhibit microbial growth, the presence of microorganisms is not always harmful. In some cases, certain microorganisms may contribute to human health, such as the human intestinal microbiota. It is composed of more than 400 bacterial species, and bifidobacteria and lactobacilli are the main ones [48]. They help in the digestion and synthesize bioactive compounds, besides preventing diseases, avoiding the growth of pathogenic microorganisms [49]. Through the consumption of probiotics and prebiotics, it is possible to maintain the balance of these intestinal bacteria. Probiotics are supplements containing the microorganisms of interest. Nondigestible carbohydrates that undergo fermentation by intestinal microbes are called prebiotics [48, 49].
Prebiotic activity was evaluated in bamboo shoots, since they are a rich source of polysaccharides and oligosaccharides [50]. The polysaccharides isolated from the shoots of Gigantochloa levis were able to stimulate the growth of Bifidobacterium animalis, Bifidobacterium longum, and Lactobacillus acidophilus. At the same time, they were able to reduce the growth of Salmonella sp., pathogenic bacteria [50]. Heteropolysaccharides-protein complexes from Phyllostachys praecox shoots were isolated, and the fractions containing these substances increased the Bifidobacterium adolescentis and Bifidobacterium bifidum counts [50]. These results suggest that bamboo shoots can be a source of probiotics.
Chinese traditional medicine has described the use of different parts of bamboos, such as leaves and rhizomes, to treat many diseases. Nowadays, scientific studies have demonstrated that bamboo extracts have excellent biological efficacy regarding their antioxidant activity. Theoretically, this activity might also be related for the treatment of diverse pathologies, such as resistance to free-radical, cardiovascular protection against neurodegenerative diseases, anticancer, and many others.
Bamboo shavings are a sort of Chinese traditional medicine that can be obtained from different bamboo species by scraping off the coating from bamboo stems, cutting the stems into slices, and binding them together by drying in shadowy places. A triterpenoid-rich extract of bamboo shavings was obtained from P. nigra var. henonis by superfluid carbon dioxide extraction and tested for antitumor activity. The extract showed a significant inhibitory activity against P388 and A549 cancer cell lines. The extract also presented an effective inhibitory effect on the sarcoma-loaded mice S180 model. Friedelin, the main compound in the extract, was also active on inhibiting the proliferation of four cancer lines, A375, L929, Hela, and THP-1 [51].
Bamboo extracts used as dietary supplement demonstrated a protective effect on the development of induced breast cancer by 7,12-dimethylbenz[a]anthracene (DMBA). A crude hydroethanolic extract from P. edulis was incorporated into a standard rodent diet at a concentration of 5 g/kg (0.5%), and it was able to delay the onset of mammary tumor by 1 week, decreasing the tumor incidence by 44% and tumor multiplicity by 67%. The biochemical analysis indicated that the activity might be related to an increased estrogen metabolism [52].
Bamboo vinegar, a natural liquid derived from the condensation produced during bamboo charcoal production, a pyrolyzate product, has been used in agriculture and used as a food additive. This liquid is composed mainly by water and acetic acid, but it also contains a variety of phenolic compounds. A vinegar preparation produced from P. pubescens reduced inducible nitric oxide synthase expression and nitric oxide levels and interleukin-6 secretion using lipopolysaccharide-activated macrophages. The mechanism proposed for the anti-inflammatory effect of the vinegar involved a decrease in reactive oxygen species production and protein kinase C-α/δ activation. The main component involved in the anti-inflammatory activity was creosol (2-methoxy-4-methylphenol) in in vivo tests [53]. Vinegars obtained from P pubescens, P. nigra, and P. bambusoides were tested for protective effect against N-methyl-
Besides the usual secondary metabolites, aqueous bamboo extracts contain many amino acids and polysaccharides that have not been investigated for their biological activities. Hypertension is associated with cardiovascular diseases such as arteriosclerosis, stroke, and myocardial infarction. Angiotensin converting enzyme (ACE, EC 3.4.15.1) is a dipeptidyl carboxypeptidase involved in different blood pressure regulating mechanisms. A peptide enriched P. pubescens shoot aqueous extract could significantly reduce systolic blood pressure, improve oxidant stress status (GSH-Px, SOD, TAC and MDA), and increase NO level in serum and NO synthase activity in kidney. This extract also decreased total cholesterol, triglyceride, and low-density lipoprotein cholesterol content and MDA level of hyperlipidemic rats. These activities were higher for crude extract rather than for the synthetic peptide used. This indicates a synergism with the phenolic compounds still present in the crude extract, such as p-coumaric acid, ferulic acid, caffeic acid, homoorientin, and orientin [55]. The antihyperlipidemic effect of these metabolites has been demonstrated later. The lipid metabolism was affected by phenolics and triterpenoids present in the inner culm water found from Dendrocalamus giganteus Wall. ex Munro. The freeze-dried powder obtained from this water was composed mainly of protocatechuic acid, p-hydroxybenzoic acid, syringic acid, friedelan-3-one, lup-20(29)-en-3-one, lup-20(29)-en-3-ol, and α-amyrin. The powder reduced the contents of triglycerides, total cholesterol, and free fatty acids in model assay with steatosis human liver cell L02 [56].
Most of the bamboo applications are related to the paper, textile, and construction industries, due to its high fiber contents. For this reason, scientists have been isolating and characterizing bamboo hemicelluloses since the 1970s. Hemicelluloses are polysaccharides found in plant cell walls that are characterized by being neither cellulose nor pectin and by having β-(1 → 4)-linked backbones with an equatorial configuration. Some of these polysaccharides are known to have an immunomodulatory activity. Hemicelluloses isolated from P. pubescens shavings showed in vitro immunomodulatory activity and significantly stimulated mouse splenocyte proliferation. All the isolated compounds markedly enhanced the phagocytosis activity and nitric oxide production of the murine macrophage RAW264 [57]. The total polysaccharide fraction of Sasa veitchii (Carrière) Rehder inhibited the production of interferon gamma (IFN-γ) by not only the toll like receptors (TLRs) but also the C-type lectin receptors (CLRs) dectin-1, and dectin-2 of BWMP also inhibited the autologous production of IFN-γ in the splenocyte culture mice splenocytes in the presence of immunostimulant fungal polysaccharides [58].
Although bamboo has been used for centuries by the Traditional Chinese Medicine, this is still a group of plant under investigated regarding its medicinal properties. In Asian countries, such as China, Korea, and Japan, among others, the most used species have already been studied regarding their biological properties and chemical composition. On the other hand, in Southern American countries, where a huge bamboo diversity is available, very little has been done to access its medicinal properties.
Several species have shown an important antioxidant potential demonstrating that they can be applied in the treatment of different diseases such as anti-inflammatory, antitumor, and several other ailments involving oxidative processes. Additionally, besides the usual secondary metabolites, bamboo extracts may contain biologically active peptides and polysaccharides. The combined effect of these macromolecules with polyphenols and other metabolites may lead to multiple biological effects, such as antifree radical, antiaging, antifatigue, antibacteria, antivirus, and as a functional dietary supplement, cosmetic ingredient, and food additive.
The authors wish to thank CAPES and CNPq for the scholarships granted.
The authors declare that there is no conflict of interest.
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