Document Detail


Enhanced welan gum production using a two-stage agitation speed control strategy in Alcaligenes sp. CGMCC2428.
MedLine Citation:
PMID:  20640447     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Batch fermentative production of welan gum by Alcaligenes sp. CGMCC2428 was investigated under various oxygen supply conditions using regulating agitation speed. Based on a three kinetic parameters analysis that includes specific cell growth rate (μ), specific glucose consumption rate (q (s)), and specific welan formation rate (q (p)), a two-stage agitation speed control strategy was proposed to achieve high concentration, high yield, and high viscosity of welan. During the first 22 h, the agitation speed in 7.5 L fermenter was controlled at 800 rpm to maintain high μ for cell growth. The agitation was then reduced step-wise to 600 rpm to maintain a changing profile with stable dissolved oxygen levels and obtain high qp for high welan accumulation. Finally, the maximum concentration of welan was reached at 26.3 ± 0.89 g L(-1) with a yield of 0.53 ± 0.003 g g(-1) and the welan gum viscosity of 3.05 ± 0.10 Pa s, which increased by an average of 15.4, 15.2, and 20.1% over the best results controlled by constant agitation speeds.
Authors:
Hui Li; Hong Xu; Hao Xu; Sha Li; Han-Jie Ying; Ping-Kai Ouyang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-07-17
Journal Detail:
Title:  Bioprocess and biosystems engineering     Volume:  34     ISSN:  1615-7605     ISO Abbreviation:  Bioprocess Biosyst Eng     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088505     Medline TA:  Bioprocess Biosyst Eng     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  95-102     Citation Subset:  IM    
Affiliation:
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Food Science and Light Industry, Nanjing University of Technology, No. 5 Xinmofan Road, Gulou District, Nanjing 210009, China.
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