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Redalyc.Isolation and Characterization of Bacterial Strains with a Hydrolytic Ciência e Tecnologia de Alimentos ISSN: 0101-2061 [email protected] Sociedade Brasileira de Ciência e Tecnologia de Alimentos Brasil MAZZUCOTELLI, Cintia Anabela; PONCE, Alejandra Graciela; KOTLAR, Catalina Elena; MOREIRA, María del Rosario Isolation and characterization of bacterial strains with a hydrolytic profile with potential use in bioconversion of agroindustial by-products and waste Ciência e Tecnologia de Alimentos, vol. 33, núm. 2, abril-junio, 2013, pp. 295-303 Sociedade Brasileira de Ciência e Tecnologia de Alimentos Campinas, Brasil Available in: http://www.redalyc.org/articulo.oa?id=395940116013 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Food Science and Technology ISSN 0101-2061 Isolation and characterization of bacterial strains with a hydrolytic profile with potential use in bioconversion of agroindustial by-products and waste Cintia Anabela MAZZUCOTELLI1,2*, Alejandra Graciela PONCE1,2, Catalina Elena KOTLAR1,2, María del Rosario MOREIRA1,2 Abstract There is a trend towards the use of novel technologies nowadays, mainly focused on biological processes, for recycling and the efficient utilization of organic residues that can be metabolized by different microorganisms as a source of energy. In the present study the isolation of bacterial strains from six different agro-industrial by-products and waste was performed with the objective of evaluating their hydrolytic capacities and suitability for use in bioconversion of specific substrates. The 34 isolated strains were screened in specific culture media for the production of various hydrolytic enzymes (lipase, protease, cellulase, and amylase). It was found that 28 strains exhibited proteolytic activity, 18 had lipolytic activity, 13 had caseinolytic activity, 15 had amylolytic activity, and 11 strains exhibited cellulolytic activity. The strains that showed the highest hydrolytic capacities with biotechnological potential were selected, characterized genotipically, and identified as Bacillus, Serratia, Enterococcus, Klebsiella, Stenotrophomonas, Lactococcus, and Escherichia genera. It was concluded that the strain isolates have a high potential for use in the bioconversion of agro-industrial waste, both as a pure culture and as a microbial consortium. Keywords: hydrolytic profile; waste management; bioconversion. 1 Introduction Agro-industrial residues are the most abundant and are generally considered the best substrates for the solid renewable resources on earth. Biomass accumulation in large substrate fermentation processes (PANDEY et al., 1992). The quantities every year results not only in the deterioration of major natural organic materials available are polymeric, e.g. the environment, but it also causes loss of potentially valuable polysaccharides (cellulose, hemicellulose, pectins, starch etc.), material which could be processed and converted into various lignin, and protein, which can be metabolized by different different value-added products. These waste materials are microorganisms as a source of energy through enzymatic packed with a tremendous source of energy and nutrients hydrolysis. While there is a wide diversity of microorganism (proteins, carbohydrates, lipids, etc.), which would otherwise be producing hydrolytic enzymes, including bacteria, yeast, and lost if they are disposed as such in the open dumps and landfills fungi, the use of indigenous microorganisms (waste native (NIGAM; PANDEY, 2009; OKONKO et al., 2009). microflora) ensures efficient activity, acting in an environment Depending on the nature of the industrial by-products to which it is adapted (PONCE; MOREIRA; ROURA, 2008). or waste, this would allow obtaining products with higher A large number of industrial processes utilize microbial digestibility and nutritional value, destined to both human and enzymes, and new areas of application have constantly been animal food (NORTEY et al., 2007; OKONKO et al., 2009). added. Enzymes can modify and improve the functional, Additionally, it would be possible to use them as renewable nutritional, and sensory properties of ingredients and carbon sources in large scale fermentation processes. Another products, and they are also used as alternatives to traditional alternative could be its utilization as raw-material for the chemical processes (PANDEY et al., 1992; KIRK; BORCHERT; production of high-value products. In recent years, there has FUGLSANG, 2002). In others words, their utilization enables been a marked trend towards the use of novel technologies, the removal of chemicals used for food processing and the mainly focused on biological processes, for recycling and minimization of waste, facilitates processes which may efficient utilization of organic residues (NIGAM; PANDEY, otherwise be impractical or uneconomic, enhances nutrition 2009; OKONKO et al., 2009). and texture, and extends shelf life of products (WHITEHURST; VAN OORT, 2009). Biotechnological processes such as solid substrate fermentation offer great opportunities for the reuse of For the above mentioned reasons, the effective use of abundant agricultural by-products and waste in these industrial by-products and waste could serve several manufacturing other products (VISHWANATHA et al., purposes such as value-added products, waste management, 2010; MUTHULAKSHMI et al., 2011). These residues and production of enzymes with potential industrial application. Received 8/8/2012 Accepted 15/2/2013 (005819) 1 Grupo de Investigación en Ingeniería en Alimentos, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, CP B7608FDQ, Mar del Plata, Provincia de Buenos Aires, Argentina, e-mail: [email protected] 2 Consejo Nacional de Investigaciones Científicas y Técnicas – CONICET, Argentina *Corresponding author DDOI http://dx.doi.org/10.1590/S0101-20612013005000038 Food Sci. Technol, Campinas, 33(2): 295-303, Apr.-June 2013 295 Isolation and characterization of bacterial strains with a hydrolytic profile The aim of this study is to isolate and characterize bacterial sterile conditions into specific agar plates. 35 µL of CEE was strains from regional agro-industrial by-products and waste by placed into each well. These plates were incubated aerobically determining their ability to produce hydrolytic enzymes (lipase, at 35 °C/48 hours, with the exception of lipolytic activity plates, protease, cellulase, and amylase) and their potential for use as a which were incubated for 72 hours. After incubation, the microbial consortium in the bioconversion of agro-industrial diameter of the halo or clear zone formed around de well was waste. measured in order to quantify enzyme activity. 2 Materials and methods 2.5 Specific media 2.1 Source of microorganisms Extracellular protease activity Microorganisms were isolated from: (a) dried defatted Qualitative protease activity assay was evaluated on wheat germ (DDWG) and (b) undried defatted wheat germ Modified Basal Medium (MM) that contained (per liter): 1 g (UDWG) supplied by the pilot plant of Facultad de Ingeniería, glucose, 2.5 g yeast extract and 14 g agar–agar supplemented with Universidad Nacional del Centro, Provincia Buenos Aires 6.2 g/L skim milk protein (5 g/L of casein) (PÉREZ BORLA; (Argentina); (c) defatted soy pellet (DSP) and (d) sunflower meal DAVIDOVICH; ROURA, 2009). The formation of clear zone (SM) supplied by an industrial plant which produces edible oils (12 mm or more) in the medium surrounding the well indicated (Cargill, Quequén, Argentina); (e) cheese whey (CW) supplied positive protease activity (PÉREZ BORLA; DAVIDOVICH; by a pilot plant which produces cheese (Universidad de Buenos ROURA, 2009). Aires, Argentina); and (f) brewer’s spent grain (BSG) supplied by Antares S.A. (Mar del Plata, Argentina). All of the samples Caseinolytic activity assay were taken under sterile conditions, placed in sample bags, and transported to the laboratory aseptically. Until use, they were The strains were screened for caseinase activity on MM maintained under sterile conditions at room temperature. supplemented with 1% casein. Positive caseinolytic activity was detected by the formation of a turbidity zone (white halo) surrounding the well (12 mm or more) (PÉREZ BORLA; 2.2 Microorganism isolation DAVIDOVICH; ROURA, 2009). 10 g of samples were blended with 70 mL of peptone water in a Stomacher (400 Circulator Homogenizer). The samples Lipolytic activity assay were serially diluted and plated onto Plate Count Agar (PCA) Qualitative lipase activity assay was evaluated on Agar (Laboratorios Britania S.A., Buenos Aires, Argentina). The plates Tween medium which contained (per liter): 10 g peptone, were incubated at 35 °C for 24-48 hours. After incubation, the 0.1 g CaCl .2 H O, 5 g NaCl, 10 mL Tween 80, and 15 g agar- different colonies with specific morphological characteristics 2 2 agar at pH of 7-7.4 (HARRIGAN, 1998). The formation of were collected and transferred to Nutrient Broth (NB), (Britania, a white precipitate around the well resulting from the deposition Argentina) in order to isolate the microorganisms from different of crystals of the calcium salt formed by the fatty acid liberated industrial waste. by the enzyme, indicates positive lipolytic activity (7 mm or more) (GOPINATH; ANBU; HILDA, 2005). 2.3 Microorganism culture and enzyme source In order to discriminate the microorganisms
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