Enhanced riboflavin production by recombinant Bacillus subtilis RF1 through the optimization of agitation speed View Full Text


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Article Info

DATE

2014-02

AUTHORS

Zai-wei Man, Zhi-ming Rao, Yi-peng Cheng, Tao-wei Yang, Xian Zhang, Mei-juan Xu, Zheng-hong Xu

ABSTRACT

Dissolved oxygen is one of the most important bioprocess parameters that could affect cell growth and product formation, and it is easy to control by changing agitation speed. In this work, the effects of agitation speed on the performance of riboflavin production by recombinant Bacillus subtilis RF1 was investigated in fed-batch fermentation. The lower agitation speed (600 rpm) was beneficial for cell growth and riboflavin biosynthesis in the initial phase of fermentation process. While, during the later phase, higher agitation speed (900 rpm) was favor for cell growth and riboflavin biosynthesis. Thus, a two-stage agitation speed control strategy was proposed based on kinetic analysis, in which the agitation speed was controlled at 600 rpm in the first 26 h and then switched to 900 rpm to maintain high μ for cell growth and high q(p) for riboflavin production during the entire fermentation process. However, it was observed that a sharp increase of agitation speed resulted in an adverse effect on cell growth and riboflavin synthesis within a short time. To avoid this phenomenon, a multi-stage agitation speed control strategy was set up based on the two-stage control strategy, the maximum concentration of riboflavin reached 9.4 g l(-1) in 48 h with the yield of 0.051 g g(-1) by applying this strategy, which were 20.5 and 21.4% over the best results controlled by constant agitation speeds. More... »

PAGES

661-667

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s11274-013-1492-0

    DOI

    http://dx.doi.org/10.1007/s11274-013-1492-0

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1005815801

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/24068533


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