用蛹虫草固体发酵法高效生产虫草素的研究

目的：研究并建立用蛹虫草固体发酵方式高效生产虫草素的最佳方法。方法：通过对不同菌株在固体发酵过程中各生长期的虫草素含量变化进行跟踪测定以及正交旋转组合设计、正交试验设计等方法，对影响虫草素产量和含量的各影响因子(包括菌种、生长期、培养基配方和环境条件等)进行系统优化。结果：JF-1是虫草素生产的最佳菌株，现蕾期是收获提取虫草素的最佳时期；最佳的培养基配方为水料比1.1∶1(mL·g^-1)，营养水中酵母膏、蛋白胨、葡萄糖的用量分别为22.6，6.0，25.4 g·L^-1，营养水pH 6.6；最佳的环境条件为：光照强度4 400 lx，每日光照时间18 h，温度18～22 ℃。结论：用以上方法固体发酵生产虫草素，经过约13 d的培养，培养基中虫草素达到0.60%，比传统液体发酵方法的最高产量高近2倍，并且培养时间缩短2 d。

Investigations on cordycepin production by solid culture of Cordyceps militaris

An efficient method to produce cordycepin by solid culture using Cordyceps militaris was investigated in this study.Firstly,the changes of cordycepin during various growing periods of solid culture using 5 strains of C.militaris were detected,the best strain and optimal growing period for cordycepin production were determined.Then,by experiments of quadratic rotation-orthogonal combination design and orthogonal design,the medium composition and growth conditions for high yield of cordycepin were optimized.W...