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Production of CGTase by a Bacillus alkalophilic CGII strain isolated from wastewater of a manioc flour industry

GCTase production by a new strain of Bacillus alkalophilic CGII isolated from Brazilian wastewater of manioc flour industry was examined. The growth medium used was composed by 1.5% starch, 1.5% nitrogen and 1% Na2CO3. Higher activity was obtained with starch, maltodextrin and galactose. When glucos...

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Bibliographic Details
Published in:Brazilian journal of microbiology 2004-09, Vol.35 (3), p.255-260
Main Authors: Freitas, Telma Luisa de(Universidade Estadual Paulista Júlio Mesquita Filho Departamento de Bioquímica e Tecnologia), Monti, Rubens(Universidade Estadual Paulista Júlio Mesquita Filho Departamento de Alimentos e Nutrição), Contiero, Jonas(Universidade Estadual Paulista Júlio Mesquita Filho Instituto de Biociências Departamento de Bioquímica e Microbiologia)
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Language:English
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Summary:GCTase production by a new strain of Bacillus alkalophilic CGII isolated from Brazilian wastewater of manioc flour industry was examined. The growth medium used was composed by 1.5% starch, 1.5% nitrogen and 1% Na2CO3. Higher activity was obtained with starch, maltodextrin and galactose. When glucose was added to the medium, no enzyme production was observed. High enzyme activity and growth were reached when aeration was increased (88.6 U/mL). The enzyme characterization showed an optimum pH and temperature 8.0 and 55ºC for starch hydrolyses, respectively. Mg+ and Ca++ showed small activation; however, Hg+ and Cu+ showed a strong enzyme inhibition. Estudou-se a produção de CGTase por uma nova cepa de Bacillus alkalophilic CGII, isolada de água residuária de uma fecularia de mandioca, durante cultivo em meio composto de 1,5% de amido, 1,5% de fonte de nitrogênio e 1% Na2CO3. A atividade enzimática foi alta quando se utilizou amido, maltodextrina e galactose como fontes de carbono. Quando se utilizou glicose no meio de cultivo não se observou produção da enzima. Atividade enzimática alta (88,6 U/mL) e melhor crescimento foram obtidos quando se aumentou a aeração. A caracterização da enzima mostrou um pH ótimo de 8,0 e temperatura ótima de 55ºC sendo que a enzima sofreu uma pequena ativação por Mg+ e Ca++. A enzima foi fortemente inibida por Hg+ e Cu+.
ISSN:1517-8382
1678-4405
1678-4405
DOI:10.1590/S1517-83822004000200015