食品科学 ›› 2010, Vol. 31 ›› Issue (7): 205-209.doi: 10.7506/spkx1002-6300-201007045

• 生物工程 • 上一篇    下一篇

阪崎肠杆菌脉冲场凝胶电泳分型及耐药研究

许龙岩1,袁慕云1,刘静宇1,赵贵明2,邹志飞1,阳 静1,焦 红1 ,*   

  1. 1.广东出入境检验检疫局技术中心食品实验室 2.中国检验检疫科学研究院食品安全研究所
  • 收稿日期:2009-06-18 修回日期:2009-12-08 出版日期:2010-04-01 发布日期:2010-12-29
  • 通讯作者: 焦 红 E-mail:jiaoh@yahoo.com.cn
  • 基金资助:

    国家质量监督检验检疫总局科研项目(2007IK180)

Pulsed-field Gel Electrophoresis Types and Drug Resistance of Enterobacter sakazakii

XU Long-yan1,YUAN Mu-yun1,LIU Jing-yu1,ZHAO Gui-ming2,ZOU Zhi-fei1,YANG Jing1,JIAO Hong1,*   

  1. 1. Food Laboratory of Technology Center, Guangdong Entry-Exit Inspection and Quarantine Bureau, Guangzhou 510623, China;
    2. Food Safety Institute, Chinese Academy of Inspection and Quarantine, Beijing 100025, China
  • Received:2009-06-18 Revised:2009-12-08 Online:2010-04-01 Published:2010-12-29
  • Contact: JIAO Hong1 E-mail:jiaoh@yahoo.com.cn

摘要:

目的:研究北京、新疆、广东、辽宁等地和新西兰、美国、印度进口食品中分离的阪崎肠杆菌(ES)分子型别和耐药情况。方法:用限制性内切酶Xba Ⅰ酶切ES 染色体DNA 进行脉冲场凝胶电泳(PFGE)实验,用BioNumerics 软件对不同地区分离的ES 进行比对,分析菌株之间的相似度。用Vitek 2 进行药敏实验,分析ES 耐药情况。结果:38 株ES(其中ES12 为标准菌株)分成37 个PFGE 型,相似度在25%~100%,未表现出优势带型和地区特异性,而部分食品被遗传紧密相关的ES 克隆株污染。药敏实验结果显示37 株ES 共有9 种耐药谱,部分菌株对呋喃类、头孢类、β- 内酰胺类耐药。结论:建立的PFGE 方法可应用于ES 的分子分型和溯源。

关键词: 阪崎肠杆菌, 脉冲场凝胶电泳, 分子分型, 食品, 耐药

Abstract:

Objectives: To investigate molecular types and drug resistance patterns of Enterobacter sakazakii isolated from foods from Beijing, Xinjiang, Guangdong, and Liaoning or imported foods from New Zealand, USA, and India. Methods: E. sakazakii chromosomal DNA was digested by restriction endonuclease Xba I and analyzed by pulsed-field gel electrophoresis (PFGE). PFGE patterns of E. sakazakii strains from different areas were compared using BioNumberics software to analyze the similarity among strains. Antibiotic susceptibility test was carried out using VITEK2 to analyze drug resistance patterns. Results: Totally 38 E. sakazakii strains revealed 37 PFGE patterns with similarity ranged from 25% to 100%. Neither significantly predominant PFGE patterns nor area specificity were observed. Moreover, some food samples were contaminated by genetically related E. sakazakii clonal strains. Furthermore, the antibiotic susceptibility test also exhibited 9 drug resistance patterns including resistance to furans, cephalosporins, and β-lactam antibiotics. Conclusion: The PFGE method described above may be used for molecular typing and source tracing of E. sakazakii.

Key words: Enterobacter sakazakii, pulsed-field gel electrophoresis, molecular typing, food, drug resistance

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