蛹虫草菌丝体液体培养条件的优化大学本科毕业论文

摘 要蛹虫草，也称北冬虫夏草，具有补虚损、益精气、保肺、益肾、止血化痰、滋补强壮等功效，是我国的名贵中草药材。本论文采纳沈阳微生物讨论所提供的蛹虫草优质菌种，通过斜面培育、液体培育等过程，获得优质的蛹虫草菌丝体，并以菌丝体重量为指标，对培育温度、初始pH 值、培育箱转速、最佳碳源、最佳氮源、最佳无机盐等液体培育条件进行单因素分析，通过正交试验法确立了蛹虫草菌丝体的最佳培育基配方。实验结果表明，蛹虫草菌丝体培育最佳碳源是葡萄糖，最佳氮源是蛋白胨，最佳无机盐是 KH2PO4和MgSO4；最佳培育基配方是葡萄糖 20g/L，蛋白胨 10g/L，KH2PO4 1.0g/L，MgSO4 0.5g/L，VB1 50mg/L；最佳培育温度是 24℃，最佳初始 pH 值是 6.0，最佳培育箱转速时 150r/min；并在最佳培育条件下绘制了蛹虫草菌丝体生长曲线，其对数期为第 5～7.5 天，菌丝体平均重为 7.07g，稳定期为第 7.5～9 天，菌丝体重为 14.63g，从第9 天后，蛹虫草菌丝体开始衰退。 关键字：蛹虫草；液体培育；正交试验法AbstractCordyceps militaris , also known as the North Cordyceps, has the effect of completing deficiency, benefiting the essence, lung and kidney, haemostatic and resolving phlegm, nourishing and strong, It is a precious Chinese herbal medicine materials.Cordyceps militaris in this paper has high quality and is provided by the Shenyang Institute of Microbiology. After taking slant culture and liquid culture processes, we get high quality Cordyceps militaris mycelia. It takes mycelium weight as an indicator to make univariate analysis of the incubation temperature, initial pH value incubator speed, the best carbon source, the best nitrogen source and the best inorganic salts liquid culture conditions. With orthogonal test method, it’s established the optimum mycelia medium. The experimental results show that the best carbon source for the mycelia is glucose, the best nitrogen source is peptone, the best inorganic salt is KH2PO4 and MgSO4.A optimum medium includes glucose 20g/L, pepton...