食品科学 ›› 2010, Vol. 31 ›› Issue (24): 355-359.doi: 10.7506/spkx1002-6630-201024078

• 分析检测 • 上一篇    下一篇

大肠杆菌O157:H7胶体金试纸条的研制

黄岭芳1,段 霞1,陈 媛2,刘文娟2,魏 华1,赖卫华1 ,*   

  1. 1. 南昌大学 食品科学与技术国家重点实验室
    2. 江西中德生物工程有限公司
  • 收稿日期:2010-08-06 修回日期:2010-11-14 出版日期:2010-12-25 发布日期:2010-12-29
  • 通讯作者: 赖卫华 E-mail:talktolaiwh@163.com
  • 基金资助:

    科技部中小企业创新基金项目(10C26223601934);南昌市重大产业化项目(2009)

Preparation of Colloidal Gold Strip for the Detection of Escherichia coli O157:H7

HUANG Ling-fang1,DUAN Xia1,CHEN Yuan2,LIU Wen-juan2,WEI Hua1,LAI Wei-hua1,*   

  1. 1. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China ;
    2. Jiangxi Zodolabs Biological Engineering Co. Ltd., Nanchang 330029, Chin
  • Received:2010-08-06 Revised:2010-11-14 Online:2010-12-25 Published:2010-12-29
  • Contact: LAI Wei-hua1 E-mail:talktolaiwh@163.com

摘要:

采用胶体金标记抗大肠杆菌O157:H7 单克隆抗体(鼠源),通过将大肠杆菌O157:H7 多克隆抗体和驴抗鼠抗体(二抗)喷涂于硝酸纤维素膜分别作为检测线和质控线,研制大肠杆菌O157:H7 胶体金快速检测试纸条。通过优化实验,确定最佳条件为标记量16.8μg/mL、标记pH8.0、封闭剂PEG20000、检测时样品最佳pH7.0~7.5。对26 株常见细菌交叉反应结果表明,该试纸条除与鼠伤寒沙门氏菌ATCC 13311 和金黄色葡萄球菌CMCC 26003 有轻微交叉反应外,与其他24 株菌均无交叉反应。该试纸条灵敏度为104CFU/mL。用该试纸条检测大肠杆菌O157:H7操作简便、快捷、灵敏度高、特异性强。

关键词: 大肠杆菌O157:H7, 胶体金, 试纸条

Abstract:

Anti-Escherichia coli O157:H7 monoclonal antibody was labeled with colloidal gold to prepare a strip for the detection of E. coli O157: H7. Anti-E. coli O157:H7 polyclonal antibody and donkey anti-mouse IgG were dispensed on the nitrocellulose membrane as the test line and control line, respectively. The optimal conjugation was performed using 16.8μg/mL antibody at the condition of pH 8.0 and blocked with PEG20000. However, the optimal pH range for the detection was 7.0-7.5. Cross-reaction test was conducted by 26 bacteria strains. Results showed no obvious cross-reaction were observed except for the slight cross-reaction from Salmonella typhimurium ATCC13311 and Staphylococcus aureus CMCC26003. Meanwhile, the sensitivity of the developed strip was up to 104 CFU/mL. Moreover, this kind of developed strip was characteristics of simple operation, rapid detection, high sensitivity and specificity.

Key words: Escherichia coli O157:H7, colloidal gold, strip

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