Produçäo e caracterizaçäo de alfa-amilase produzida por Rhizopus sp / Production and characterization of alfa-amilase from Rhizopus sp
Arq. biol. tecnol
; 39(4): 831-9, dez.1996. tab, graf
Article
em Pt
| LILACS
| ID: lil-238883
Biblioteca responsável:
BR16.1
RESUMO
A strain of Rhizopus sp. screened among more than 800 filamentous fungi showed great ability to produce a thermostable alfa-amylase by solid state fermentation. The best production was obtained with a bran moisture content of 40 per cent when the enzyme activity reached 60 EU/g. of medium. During the purification procedures, a column of DEAE- Sephadex A-50 separeted the enzyme in two fractions and the larger (85 per cent of the total activity) showed optimum pH in a range from 4.0 to 5.6. Optimum temperature was found at 60-65§ C and in this range no loss of activity was observed after 60 min. of treatment in pH 5,0. Its Km and Vm are, respectively, of 5.0 mg/ml of starch and 10,01 uMol of reducing sugar/min./mg. of protein. Its molecular weight was calculated in 64.000 by gel filtration in Sephadex G-200. The dextrinization power of the enzyme was observed preferentialy on substrates compound by chain with higher ramifications, traht is amylopectin > starch> amylose. Other aspects of the enzyme pattern action are also discussed
Buscar no Google
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Rhizopus
/
Amido
/
Indução Enzimática
/
Alfa-Amilases
/
Tecnologia de Alimentos
/
Amilopectina
/
Amilose
Idioma:
Pt
Revista:
Arq. biol. tecnol
Assunto da revista:
BIOLOGIA
/
BIOTECNOLOGIA
Ano de publicação:
1996
Tipo de documento:
Article
País de publicação:
Brasil