食品科学 ›› 2008, Vol. 29 ›› Issue (10): 528-530.

• 分析检测 • 上一篇    下一篇

双抗夹心ELISA法定量检测食品中大肠杆菌O157:H7初探

 宋宏新, 马冬, 薛海燕, 李红心   

  1.  陕西科技大学生命科学与工程学院;
  • 出版日期:2008-10-15 发布日期:2011-12-08

Quantitative Detection of E.coli O157:H7 in Foods by Double Antibody Sandwich ELISA Method

 SONG  Hong-Xin, MA  Dong, XUE  Hai-Yan, LI  Hong-Xin   

  1. Institute of Life Science and Engineering,Shaanxi University of Science and Technology,Xianyang 710021,China
  • Online:2008-10-15 Published:2011-12-08

摘要: 以鸡抗O157:H7特异性脂多糖(LPS)抗体(IgY)为捕获抗体,酶标抗体(HRP-IgY)为检测抗体建立双抗夹心ELISA法检测食品中大肠杆菌O157:H7的方法,确定了抗原浓度对数与OD450值的高度线性相关性,根据检测OD450值可从拟合回归曲线确定样品中的含菌量,含菌量≥104CFU/ml的食品样品可直接用双抗夹心法进行检测,含菌量≤104CFU/ml的食品样品可增菌14h后检测。

关键词: 大肠杆菌O157:H7, 食源性病原菌定量检测, 双抗夹心ELISA

Abstract: In order to establish the quantitative detection method of E.coli O157:H7 in foods by using double antibody sandwich ELISA,the IgY produce by chicken against E.coli O157:H7 specific lipopolysaccharide was used as capture antibody,and the HRP-IgY was used as detection antibody. In the conclusion,when the quantity of E.coli O157:H7 in foods is more than 104 CFU/ ml,it can be dectect directly by double antibody sandwich ELISA,but when the quantity of E.coli O157:H7 in foods is less than 104 CFU/ml,the food must enrich the bacterium for 14 h,and then be detected by double antibody sandwich ELISA.

Key words: E.coli O157:H7, foodborne pathogenic microorganism quantitative detection, double antibody sandwich ELISA