贝莱斯芽孢杆菌发酵培养基的响应面法优化
DOI:
https://doi.org/10.70693/cjst.v2i5.2119Keywords:
贝莱斯芽孢杆菌, 培养基优化, 响应面法, 二次多项式模型, 生物量Abstract
以Bacillus velezensis为试验菌株,选取酵母浸粉、胰蛋白胨、氯化钠3个培养基组分,结合单因素试验与Box-Behnken响应面设计优化发酵培养基。单因素试验结果表明,酵母浸粉、胰蛋白胨显著影响菌体生长,氯化钠在设置浓度范围内仅微弱促进菌株增殖,因素影响强弱顺序为酵母浸粉>胰蛋白胨>氯化钠。响应面分析显示,各因素两两交互作用均不显著(P>0.05)。虽然整体回归模型未达到显著水平,但模型寻优结果具备参考价值,得到最优培养基配方:酵母浸粉6.5 g/L、胰蛋白胨25.5 g/L、氯化钠14.5 g/L。验证试验结果表明,基础培养基条件下菌株最大OD600为2.827;优化后培养基菌株最大OD600可达6.721,生物量较优化前提升137.74%,实测值与模型预测值相对误差小于5%。该优化培养基可显著提高Bacillus velezensis生物量,为菌株高密度发酵工艺提供参考。
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