Gibberella intermedia WX12产特异性糖苷酶的发酵工艺优化
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Optimization of Culture Conditions for Specific Production of Glycosidase from Gibberella intermedia WX12
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    摘要:

    赤霉菌(Gibberella intermedia WX12)糖苷酶能将黄姜薯蓣皂苷转化为薯蓣皂苷元。先后采用单因素实验和正交实验对G. intermedia WX12发酵产糖苷酶的培养基组分和发酵工艺进行了优化。确定最佳发酵工艺条件为:葡萄糖5 g/L,酵母粉25 g/L,NaCl 1.16 g/L,KH2PO4 2.72 g/L,MgSO2 0.3 g/L,培养基初始pH 6.0,接种量为体积分数8%。G. intermedia WX12在上述条件下,于220 r/min、30 ℃摇床培养96 h,糖苷酶活性达到28.1 U/mL,较优化前提高4倍。在此基础上利用粗酶液对黄姜薯蓣皂苷进行转化,50 ℃条件下转化12 h后,薯蓣皂苷元转化率可达到60%。

    Abstract:

    A glycosidase from Gibberella intermedia WX12 could convert dioscin into diosgenin. Through the single factor and orthogonal experiments,the optimal fermentation medium was found to consist of 5 g/L glucose,25 g/L yeast,1.16 g/L NaCl,2.72 g/L KH2PO4 and 0.3 g/L MgSO4 and the culture parameters for dioscin-glycosidase production were temperature 30 ℃,rotation speed 220 r/min,initial pH 6.0 and inoculum size 8.0%(v/v). With these conditions,the enzyme production had a similar trend to that of cell growth curve,and the highest activity of glycosidase reached 28.1 U/mL after fermentation for 96 h,which was 5 times higher than that before optimization. A conversion rate of 60% was achieved when the obtained crude enzyme was used to convert dioscin from Dioscorea zingiberensis C.H. Wright into diosgenin at 50 ℃ for 12 h.

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杨南南,李会,吴燕,张晓梅,许正宏,史劲松. Gibberella intermedia WX12产特异性糖苷酶的发酵工艺优化[J].食品与生物技术学报,2016,35(10):1028-1034.

YANG Nannan, LI Hui, WU Yan, ZHANG Xiaomei, XU Zhenghong, SHI Jingsong. Optimization of Culture Conditions for Specific Production of Glycosidase from Gibberella intermedia WX12[J]. Journal of Food Science and Biotechnology,2016,35(10):1028-1034.

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  • 在线发布日期: 2016-10-31
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