Enhancement of selectivity for producing gamma-cyclodextrin.
Appl Biochem Biotechnol
; 84-86: 955-62, 2000.
Article
em En
| MEDLINE
| ID: mdl-10849849
The production of cyclodextrins (CDs) by cyclodextrin-glycosyl-transferase (CGTase) from Bacillus firmus was studied, with respect to the effect of the source of starch upon CD yield and on the selectivity for producing gamma-CD. Cyclodextrin production tests were run for 24 h at 50 degrees C, pH 8.0, and 1 mg/L of CGTase, and substrates were maltodextrin or the starches of rice, potato, cassava, and corn hydrolyzed up to D.E. 10. Cornstarch was the best substrate for producing gamma-CD. Later, glycyrrhizin (2.5% [w/v]), which forms a stable complex with gamma-CD, was added to the cornstarch reaction medium and increased the yield of gamma-CD to about four times that produced with only maltodextrin, but the total yield of CDs remained practically unchanged. Therefore, the results showed that the studied CGTase is capable of giving relatively high yield of gamma-CD in the presence of glycyrrhizin as complexant and cornstarch as substrate.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ciclodextrinas
/
Gama-Ciclodextrinas
/
Glucosiltransferases
Idioma:
En
Revista:
Appl Biochem Biotechnol
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Estados Unidos