食品科学 ›› 2018, Vol. 39 ›› Issue (6): 95-100.doi: 10.7506/spkx1002-6630-201806016

• 生物工程 • 上一篇    下一篇

乳酸对阴沟肠杆菌的抑菌作用及其机制分析

王凤婷1,2,孙芝兰2,吴海虹2,许晓曦1,*,刘芳2,*,王道营2,耿志明2,诸永志2,徐为民2   

  1. (1.东北农业大学食品学院,黑龙江?哈尔滨 150030;2.江苏省农业科学院农产品加工研究所,江苏?南京 210014)
  • 出版日期:2018-03-25 发布日期:2018-03-14
  • 基金资助:
    国家自然科学基金面上项目(31371802);江苏省自然科学基金面上项目(BK20151367);江苏省产学研项目(BY2015073)

Antimicrobial Activity and Mechanism of Lactic Acid on Enterobacter cloacae

WANG Fengting1,2, SUN Zhilan2, WU Haihong2, XU Xiaoxi1,*, LIU Fang2,*, WANG Daoying2, GENG Zhiming2, ZHU Yongzhi2, XU Weimin2   

  1. (1. College of Food Science, Northeast Agricultural University, Harbin 150030, China;2. Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China)
  • Online:2018-03-25 Published:2018-03-14

摘要: 以自主分离的一株冰鲜鸡肉产品的优势腐败菌——阴沟肠杆菌为指示菌,研究乳酸对该菌的抑菌机制。结果发现各质量分数乳酸(1.0%、0.5%、0.25%)均对阴沟肠杆菌具有一定的杀菌效果;乳酸处理后菌体的细胞电势增加,ATP和紫外吸收物质有明显的泄漏;透射电镜观察发现,乳酸处理后的菌株形态变得不规则,细胞壁损伤明显,细胞内容物渗出;通过激光扫描共聚焦显微镜和流式细胞仪检测也发现,乳酸处理后的菌株细胞通透性增加。因此,乳酸抑菌效应主要通过作用于细胞壁,导致细胞壁损伤和细胞通透性增加,改变细胞内外电势,造成内容物的泄漏,发挥杀菌作用。

关键词: 乳酸, 阴沟肠杆菌, 抑菌机制

Abstract: The antimicrobial activity of lactic acid (LA) against a dominant strain of Enterobacter cloacae isolated from spoiled frozen chicken was examined in the study. The results showed that all the selected LA solutions (1.0%, 0.5%, and 0.25%) had bactericidal action against E. cloacae. The cell membrane potential and the leakage of intracellular ATP and ultraviolet-absorbing substances were increased in cells treated with 1.0% LA. The treated cells showed an irregular morphology under transmission electron microscope (TEM); furthermore, the cell wall was damaged and the intracellular contents were leaked out. The permeability of the cytoplasmic membrane was increased as shown by laser scanning confocal microscope and flow cytometry. Therefore, the bactericidal effect of LA against E. cloacae was mainly mediated by damaging the cell wall and consequently increasing the cell membrane permeability, thereby leading to leakage of the intracellular components.

Key words: lactic acid, Enterobacter cloacae, antibacterial mechanism

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