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Characterization of a tannase from Emericela nidulans immobilized on ionic and covalent supports for propyl gallate synthesis |
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| Authors: | Heloísa Bressan Gonçalves João Atílio Jorge Benevides Costa Pessela Glória Fernandez Lorente José Manuel Guisán Luis Henrique Souza Guimarães |
| Institution: | 1. Instituto de Química de Araraquara – UNESP, Rua Prof. Francisco Degni s/n°, Araraquara, 14800-000, Brazil 2. Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeir?o Preto – USP, Avenida Bandeirantes 3900, Ribeir?o Preto, 14040-901, Brazil 3. Departamento de Microbiologia, Instituto de Fermentaciones Industriales, CSIC, C/Juan de La Cierva 3, 28006, Madrid, Spain 4. Departamento de Biocatálisis, Instituto de Catálisis y Petroleoquímica, CSIC, Universidad Autonoma de Madrid, C/Marie Curie 2, 28049, Madrid, Spain |
| Abstract: | The extracellular tannase from Emericela nidulans was immobilized on different ionic and covalent supports. The derivatives obtained using DEAE-Sepharose and Q-Sepharose were thermally stable from 60 to 75 °C, with a half life (t50) >24 h at 80 °C at pH 5.0. The glyoxyl-agarose and amino-glyoxyl derivatives showed a thermal stability which was lower than that observed for ionic supports. However, when the stability to pH was considered, the derivatives obtained from covalent supports were more stable than those obtained from ionic supports. DEAE-Sepharose and Q-Sepharose derivatives as well as the free enzyme were stable in 30 and 50 % (v/v) 1-propanol. The CNBr-agarose derivative catalyzed complete tannic acid hydrolysis, whereas the Q-Sepharose derivative catalyzed the transesterification reaction to produce propyl gallate (88 % recovery), which is an important antioxidant. |
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