食品科学 ›› 2010, Vol. 31 ›› Issue (23): 214-218.doi: 10.7506/spkx1002-6630-201023048

• 生物工程 • 上一篇    下一篇

裂解性福氏志贺氏菌噬菌体SF-A2 的生物学特性及其在巴氏杀菌牛奶中的灭菌效果

张 辉,王 冉*,包红朵   

  1. 江苏省农业科学院 农业部食品安全监控重点开放实验室,江苏省食品质量安全重点实验室- 省部共建国家重点实验室培育基地,江苏省畜禽产品安全性研究重点实验室,
  • 收稿日期:2010-09-19 出版日期:2010-12-15 发布日期:2010-12-29
  • 通讯作者: 王 冉 E-mail:wangran2001@126.com
  • 基金资助:

    江苏省自然科学基金项目(BK2009328);江苏省农业科技自主创新项目(cx(10)438)

Biological Characteristics of Lytic SF-A2 Phage and Its Sterilization Effect in Milk

ZHANG Hui,WANG Ran*,BAO Hong-duo   

  1. Key Laboratory of Agro-Food Safety and Quality, Ministry of Agriculture, Key Laboratory of Food Quality and Safety of Jiangsu
    Province-State Key Laboratory Breeding Base, Key Laboratory of Animal-derived Food Safety of Jiangsu Province, Jiangsu Academy of
    Agricultural Sciences, Nanjing 210014, China
  • Received:2010-09-19 Online:2010-12-15 Published:2010-12-29
  • Contact: WANG Ran E-mail:wangran2001@126.com

摘要:

分离裂解性福氏志贺氏菌(Shigella flexneri)噬菌体,鉴定其生物学特性,研究其在巴氏杀菌牛奶的灭菌效果。以福氏志贺氏菌为宿主菌,从污水中分离获得特异性针对福氏志贺氏菌的具有高裂解活性的噬菌体,命名为SF-A2。运用PEG/NaCl 法纯化SF-A2,经负染后电镜观察,该噬菌体为肌尾科噬菌体。生物学特性分析表明:该噬菌体特异性针对福氏志贺氏菌,且对温度及pH 值具有良好的耐受能力。将SF-A2 以高感染复数(103)用于即食性食品(牛奶)中的福氏志贺氏菌的生物防控实验。结果表明:SF-A2 能够有效灭菌,在加入48h 后,福氏志贺氏菌降低了3lg(CFU/mL);作用至72h,能够完全将福氏志贺氏菌灭活。从而表明,裂解性福氏志贺氏菌噬菌体SF-A2具有良好的杀菌能力,能够在食品中防控福氏志贺氏菌的污染,也为防治由福氏志贺氏菌引起的腹泻性疾病提供生物源性治疗源。

关键词: 裂解性福氏志贺氏菌, 噬菌体, 生物防控

Abstract:

In order to analyze biological characteristics of Shigella flexneri (S. flexneri) phage and its sterilization effect in milk, the lytic S. flexneri phage SF-A2 was isolated from sewage. Electron microscope observation showed that purified phage SF-A2 was a member of family Myoviridae. Based on its biological characteristic assay, phage SF-A2 exhibited the tolerance to temperature and pH. In addition, phage SF-A2 could effectively inactivate S. flexneri. After adding phage SF-A2 for 48 h, the concentration of S. flexneri was reduced by 103 folds compared with the host control. After 72 h incubation, the concentration of S. flexneri was declined to the limit of detection. Therefore, SF-A2 is a virulent bacteriophage and can effectively inactivate S. flexneri in ready-to-eat milk. It will be a good biological control agent for food safety and also an efficient antimicrobial source for diarrhea.

Key words: Shigella flexneri, bacteriophage, biological control

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