高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (5): 1065.

• 研究论文 • 上一篇    下一篇

非标记液晶型免疫传感器检测赭曲霉素A

杨胜园1,2, 谭慧1, 刘艳梅1, 吴朝阳1, 沈国励1, 俞汝勤1   

  1. 1. 湖南大学化学生物传感与计量学国家重点实验室, 长沙 410082;
    2. 南华大学公共卫生学院卫化检测教研室, 衡阳 421001
  • 收稿日期:2010-06-30 修回日期:2010-10-15 出版日期:2011-05-10 发布日期:2011-04-11
  • 通讯作者: 吴朝阳 E-mail:zywu@hnu.edu.cn
  • 基金资助:

    国家“九七三”计划项目(批准号: 2007CB310500)和国家“八六三”计划项目(批准号: 2009AA063004)资助.

Detection of Ochratoxin A by Label\|Free Liquid Crystal Immunosensor

YANG Sheng-Yuan1,2, TAN Hui1, LIU Yan-Mei1, WU Zhao-Yang1*, SHEN Guo-Li1, YU Ru-Qin1   

  1. 1. State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China;
    2. Department of Health Laboratory Technology, School of Public Health, Nanhua University, Hengyang 421001, China
  • Received:2010-06-30 Revised:2010-10-15 Online:2011-05-10 Published:2011-04-11
  • Contact: WU Zhao-Yang E-mail:zywu@hnu.edu.cn
  • Supported by:

    国家“九七三”计划项目(批准号: 2007CB310500)和国家“八六三”计划项目(批准号: 2009AA063004)资助.

摘要: 本文研究一种基于液晶取向改变的非标记液晶型免疫传感器用于检测赭曲霉素A。采用戊二醛交联法将赭曲霉素A固定于修饰了自组装膜的玻璃基底表面。利用自组装膜能诱导液晶分子垂直排列,加入的赭曲霉素A抗体能扰乱液晶分子取向有序的排列,导致液晶分子在化学敏感膜表面的取向发生变化使光学信号的亮度及色彩发生变化的特性,实现对OTA的检测。本方法对OTA的检测范围为0.01 ng/mL ~ 10 ng/mL,具有灵敏度高、特异性好、非标记、操作简单等特点。

关键词: 液晶, 自组装膜, 免疫传感器, 赭曲霉素A

Abstract: A novel liquid crystal immunosensor based on the indirect competitive assay format was developed for the detection of ochratoxin A (OTA). In this method, the OTA was tethered onto the self-assembled film surface on a glass slide via a cross-linker glutaradehyde. The specific binding event of anti-OTA antibody and ochratoxin A induced the homeotropic-to-tilted transition of LCs, resulting in the corresponding changes of opitical images under the crossed polarized light. The LC-based imaging method has a good signal-to-noise ratio and a clear distinction between positive and negative results. When the concentration of analyte OTA exceeds a critical value (0.01 ng/mL) , the opitical images gives a very sharp response. The opitical images changes with the concentration of OTA in a dynamic range of 0.01–10 ng/mL .The fabricated sensor is show to exhibit high sensitivity, desirable selectivity, label free and ease in operation。

Key words: liquid crystal, self-assembled film, immunosensor, ochratoxin A

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