γ-亚麻酸生产菌种的改良及发酵条件优化的中期报告
γ-亚麻酸生产菌种的改良及发酵条件优化的中期报告摘要:γ-亚麻酸是一种重要的不饱和脂肪酸,具有广泛的应用价值。为了提高γ-亚麻酸产量,本研究选取γ-亚麻酸生产菌株并进行了改良,同时优化了发酵条件。结果
γ- 亚麻酸生产菌种的改良及发酵条件优化的中期报 告 摘要: γ- 亚麻酸是一种重要的不饱和脂肪酸,具有广泛的应用价值。为了 γ-γ- 提高亚麻酸产量,本研究选取亚麻酸生产菌株并进行了改良,同时 γ- 优化了发酵条件。结果表明,改良菌株的亚麻酸产量比野生型菌株提 20% 高了约,且产酸速率也更快。通过响应面法优化得到的最佳发酵条 36℃pH7.030 g/L 件为:温度,值,初始浓度为的葡萄糖作为碳源,发 72 hγ-6.85 g/L 酵时间。在此条件下,亚麻酸的产量可达到。 γ- 关键词:亚麻酸;菌种改良;响应面法;发酵条件优化 Introduction: γ-linolenic acid (GLA) is an important unsaturated fatty acid with wide application value. In order to improve the yield of GLA, this study selected GLA-producing strains and improved them, while optimizing the fermentation conditions. The results showed that the GLA yield of the improved strain was about 20% higher than that of the wild-type strain, and the acid production rate was faster. The optimal fermentation conditions obtained by response surface methodology were: temperature 36℃, pH value 7.0, glucose concentration of 30 g/L as carbon source, and fermentation time of 72 h. Under these conditions, the yield of GLA can reach 6.85 g/L. Keywords: γ-linolenic acid; strain improvement; response surface methodology; fermentation condition optimization 材料和方法: 1. 菌种选取 GLA 在本研究中,我们选用了黑曲霉和霉菌菌株作为生产菌株。 2. 菌种改良 γ- 通过对菌株的基因进行改良,使其亚麻酸合成的能力得到提高。

