期刊
BIORESOURCE TECHNOLOGY
卷 99, 期 9, 页码 3685-3691出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2007.07.027
关键词
leuconostoc dextranicum; glucosyltransferase; glucan; Plackett-Burman; central composite design
Statistically-based experimental designs were applied to optimize the fermentation for the production of glucosyltransferase by Leuconostoc dextranicum NRRL B-1146. Eleven medium components were examined for their significance on enzyme production using Plackett-Burman factorial design. Tween 80, sucrose and K2HPO4 significantly improved the enzyme production process. The combined effect of these nutrients on glucansucrase production were studied using a 2 2 full-factorial central composite design, a second-order polynomial was established to identify the relationship between the enzyme output and the three medium components. The optimal concentration of variables for maximum glucansucrase production were Tween 80 (0.55%, v/v); sucrose (5.6%, w/v) and K2HPO4 (1%, w/v). The maximum enzyme activity by predicted model was 6.53 U/ml that was in perfect agreement with the actual experimental value (6.40 U/ml). (C) 2007 Elsevier Ltd. All rights reserved.
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