Nisin产生菌株的筛选及产物初步探究与鉴定Screening of Nisin-producing Strains and Preliminary Exploration and Identification of Their Products
李俊辉,王燕,周宝琳,李丕武,赵鑫君,王婷
摘要(Abstract):
通过改良GM17培养基,以蔗糖为唯一碳源,加入0.004%溴甲酚紫和1500IU/mg的Nisin标准品,从新鲜的白菜叶片表面筛选到具有Nisin耐受性、产酸、革兰氏阳性的球形菌株,经牛津杯法抑菌圈试验和16SrDNA初步鉴定为乳酸乳球菌(Lactococcus lactis),命名为L-217;通过对该菌株发酵液中的抑菌物质进行稳定性验证,发现其在低pH及90℃水浴条件下均具有良好的稳定性;采用大孔吸附树脂对发酵液中的抑菌物质进行吸附并浓缩纯化,通过高效液相色谱法(HPLC)将纯化液与Nisin标准品进行对比,确定抑菌物质为Nisin。
关键词(KeyWords): Nisin;抑菌圈试验;乳酸乳球菌;稳定性;高效液相色谱法(HPLC)
基金项目(Foundation): 山东省重点研发计划(2018YYSP002,2018GSF121020,2017YYSP001);; 中国博士后科学基金第62批面上资助项目(2017M622110);; 山东省博士后创新项目专项资助(201703081)
作者(Author): 李俊辉,王燕,周宝琳,李丕武,赵鑫君,王婷
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