产甘草次酸内生真菌GRE111的鉴定及发酵条件研究Study on Identification and Fermentation Conditions of Glycyrrhetinic Acid-Producing Endophytic Fungus GRE111
万璐,闫佳佳,尤梦瑶,郑春英
摘要(Abstract):
采用HPLC法,以甘草次酸为对照,分析内生真菌GRE111的活性成分;采用琼脂扩散法,对内生真菌GRE111进行抑菌活性分析,并采用单因素实验及正交实验法对内生真菌GRE111发酵条件进行优选;采用形态学观察及ITS序列分析法对内生真菌GRE111进行菌种鉴定。结果表明,在内生真菌GRE111发酵液中含有甘草次酸;抑菌活性实验结果表明,内生真菌对10种致病菌均有较好的抑制作用,尤其对金黄色葡萄球菌的抑菌效果较为明显;经优化,GRE111的最佳发酵工艺为培养基中葡萄糖质量浓度1.0%,蛋白胨质量浓度1.0%,初始pH值7.0,装液量50%,接种量5%,培养时间14 d,摇床转速140 r/min;经鉴定,内生真菌GRE111为产黄青霉(Penicillium chrysogenum)。研究表明,内生真菌GRE111为甘草次酸产生菌,该研究为采用微生物发酵法生产甘草次酸奠定了基础。
关键词(KeyWords): 甘草次酸;内生真菌;抑菌活性;发酵条件;鉴定
基金项目(Foundation): 黑龙江大学校企合作横向项目(20170223)
作者(Author): 万璐,闫佳佳,尤梦瑶,郑春英
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