Characterization of extracellular cellulose-degrading enzymes from bacillus thuringiensis strains
Electron. j. biotechnol
; 15(3): 2-2, May 2012. ilus, tab
Article
em En
| LILACS
| ID: lil-640546
Biblioteca responsável:
CL1.1
ABSTRACT
The gram-positive spore-forming bacteria, Bacillus thuringiensis (Bt) strains produced novel cellulases which could liberate glucose from soluble cellulose, carboxymethyl cellulose (CMC), and insoluble crystalline cellulose. The maximal cellulase activities were obtained after 60 hrs incubation at 28ºC in a LB broth medium with 1 percent CMC. Maximum CMCase activities were got at 40ºC and pH 4.0, respectively, and more than 50 percent of its maximal activity was retained at 40-60ºC for 1 hr, while approximately 40 percent of its maximal activity was also retained after incubating at 70ºC for 1 hr. Most metal ions and reagents such as Ca2+, Mg2+, Cd2+, Pb2+, Zn2+, Cu2+, EDTA, and SDS inhibited the enzyme activities, but K+ and Mn2+ activated the activities. The enzymes from Bacillus thuringiensis strains could be applied in bioconversion of lignocellulosic biomass into fermentable sugars.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Bacillus thuringiensis
/
Celulases
Idioma:
En
Revista:
Electron. j. biotechnol
Assunto da revista:
BIOTECNOLOGIA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
China
País de publicação:
Chile