产细菌素乳酸菌的筛选

目的]开发出更加高效、抑菌谱更广、可做天然防腐剂的细菌素。方法]以泡菜、酸奶为原料,利用MRS选择培养基从试材中筛选出能够抑制指示菌的细菌,通过排除酸抑制作用、过氧化氢抑制作用和蛋白酶敏感性试验证明该菌株是否产生有抑菌作用的细菌素。结果]筛选得到的菌株经鉴定证明是乳酸菌,其产生的细菌素对革兰氏阴性菌和革兰氏阳性菌都有抑制作用,是一株产广谱细菌素的乳酸菌。结论]筛选得出的乳酸菌细菌素在抑制各种病原菌和食品腐败等方面具有重要作用。

Screening of Bacteriocin-producing Lactic Acid Bacteria

Objective]To develop a strain of high-efficient bacteriocin with broader antimicrobial spectrum as natural preservative.Method]With pickles and yoghurt as raw materials,the bacteria,which could inhibit the indicator bacteria,was screened from the test materials by using MRS selective medium,and whether the bacteria could produce bacteriocin or not was determined by the tests of excluding acid inhibition,hydrogen peroxide inhibition and protease sensitivity.Result]The screened strain was identified to be lactic acid bacteria,the produced bacteriocin had inhibitive effect against gram-negative and gram-positive bacteria,and it was a strain of lactic acid bacteria with broad spectrum and the ability of bacteriocin-producing.Conclusion]The bacteriocin-producing lactic acid bacteria had important roles in inhibiting various pathogens and food decay.