为提高灵菌红素产率,本研究通过单因素试验和正交试验优化粘质沙雷氏菌发酵培养基组分和发酵条件,结果表明,最佳培养基配方为:一级大豆油、蛋白胨、Na Cl和K2HPO4的添加量分别为4 m L/100 g、1.5%、0.15%和0.15%;最佳发酵条件为:温度30℃、接种量1%、装液量70 m L/250 m L三角瓶、振荡培养转速200 r/min,发酵36 h后,灵菌红素的产量最大,为2.98 g/L。粘质沙雷氏菌的胞外脂肪酶活力为15 U/m L。
[ Objective] The aim was to study pretreatment of ultrasound enhancing dilute H2SO4 on cellulase activity of corn straw liquid fermentation and explore the pretretment＇ s optimal conditions. [ Method ] By using orthogonal test, the pretretment of ultrasound enhancing dilute H2SO4 on corn straw was studied, then straw was fermented as the sole carbon source. Finally, the cellulase activity in extracellular fermentation broth was determined. [Result] The results showed that cellulase activity in extracellular broth was greatest under the conditions of acid bath time 3 h, acid concentration 3.5%, ultrasonic power 150 W, and ultrasonic time 5 h. They were FPA 15.82 U/ml, Cx 39.9 U/ml, 13-Giu 55.94 U/ml respectively. [ Conclusion] Under the above conditions, extracellular cellulase production has a high stability.
