Data/hora: 10/06/2024 09:10:53

Provedor de dados: 	52	
País: 	Brazil	
Título: 	Immobilization of alpha-amylase produced by Bacillus circulans GRS 313	
Autores: 	Dey,Gargi; Bhupinder,Singh; Banerjee,Rintu.	
Data: 	2003-03-01	
Ano: 	2003	
Palavras-chave: 	Bacillus circulans GRS313; Entrapment; Maltooligosaccharide-forming amylase; Response surface methodology; Starchy residues.	
Resumo: 	A maltooligosaccharide-forming amylase from B circulans GRS 313 was immobilized by entrapment in calcium alginate beads. The immobilized activity was affected by the size of the bead and bead size of 2mm was found to be most effective for hydrolysis. Kinetics constants, Km and Vmax were estimated and were found to be affected by the bead size. The catalytic activity of the enzyme was studied in presence of various starchy residues and metal ions. HgCl2, CuSO4 and FeCl3 caused inhibition of the enzyme. The reaction conditions, pH and temperature, was optimized using response surface methodology. At the optimum pH and temperature of 4.9 and 57ºC, the apparent activity was 25.6U/g of beads, resulting in almost 2-fold increase in activity. The immobilized enzyme showed a high operational stability by retaining almost 85% of the initial activity after seventh use.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000200005	
Editor: 	Instituto de Tecnologia do Paraná - Tecpar	
Relação: 	10.1590/S1516-89132003000200005	
Formato: 	text/html	
Fonte: 	Brazilian Archives of Biology and Technology  v.46 n.2 2003	
Fonte: 	info:eu-repo/semantics/openAccess