聚唾液酸高产菌株的高通量诱变选育及发酵工艺优化
Chinese Journal of Bioprocess Engineering(2022)
Abstract
从自然水体中筛选得到1株产聚唾液酸的微生物菌株SA-1,经Biolog生化和分子生物学分析,鉴定其为大肠杆菌.以大肠杆菌SA-1为出发菌株,通过常压室温等离子体(ARTP)诱变育种,借助酸碱透明圈和高通量自动挑选仪筛选获得高产聚唾液酸的突变菌株SA-18.摇瓶发酵结果显示,大肠杆菌突变株SA-18的聚唾液酸产量可达0.95 g/L,是出发菌株产量(0.20 g/L)的4.75倍;进一步,通过调控优化K2HPO4浓度实现了突变大肠杆菌SA-18的高密度发酵:当K2HP04质量浓度为5.0 g/L时,在10 L发酵罐中,36 h时聚唾液酸产量达到12.20 g/L,继续补料发酵,至60 h时,聚唾液酸产量最高可达16.10 g/L.
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