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Cellulase Production by Endophytic Strains of <i>Trichoderma reesei</i>from <i>Baccharis dracunculifolia</i>D. C. (Asteraceae)

引用

Advances in Microbiology 2014年第5期4卷 275-283页

作者： Sideney Becker Onofre Taismara Bonfante Zípora Morgana Quinteiro dos Santos marielly coradin de moura Aline Filakowski Cardoso departamento de Ciências Biológicas e da Saúde Universidade Paranaense UNIPAR Unidade Universitária de Francisco Beltr&#227o Francisco Beltr&#227o Paraná Brasil Laboratório de Microbiologia Departamento de Ciências Biológicas da Uni&#227o de Ensino do Sudoeste do Paraná UNISEP Campus de Francisco Beltr&#227o Francisco Beltr&#227o Paraná Brasil

Cellulases are enzymes responsible for the degradation of cellulose, the major compound in plant cells. Cellulose is a polysaccharide composed of several glucose units linked together by chemical bonds. Cellulases, such as endoglucanases, beta-glucosidase and exoglucanases, break the chemical bonds between the glucose units. Fungi, including the endophytic species, can be great cellulase producers. This study aimed to evaluate cellulase production by four endophytic strains of Trichoderma reesei semi-solid media containing sugarcane bagasse, supplemented or not with salts. Two fermentations were carried out for 43 days. Samples were taken every seven days to obtain production peaks. The enzymes were characterized by their optimum pH and temperature of activity and stability upon incubation in the presence of ions, pH and temperature variations. The results showed that the endophytic strains FB1, FB2, FB3 and FB4 of Trichoderma reesei produce cellulases in a sugarcane bagasse medium, supplemented or not with salts, at pH 5.5 and 30°C. The supplemented medium proved to be more appropriate to induce cellulase production after 29 days of fermentation, with FB4 having the best yield: 16.32 ± 2.65 IU/gram of fermented substrate.

关键词： Substrate Fermentation Processes Enzymes Cellulases

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