食品科学

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河豚毒素DNA适配子的制备及应用

邵碧英,陈 彬,陈文炳,杨 方,缪婷玉,彭 娟   

  1. 福建出入境检验检疫局检验检疫技术中心,福建省检验检疫技术研究重点实验室,福建 福州 350001
  • 出版日期:2014-12-25 发布日期:2014-12-29
  • 基金资助:

    国家质检总局科研项目(2010IK145;2014IK104)

Preparation and Application of Tetrodotoxin DNA Aptamer

SHAO Bi-ying, CHEN Bin, CHEN Wen-bing, YANG Fang, MIAO Ting-yu, PENG Juan   

  1. Fujian Provincial Key Laboratory of Inspection and Quarantine Technology Research, Center of Inspection and Quarantine Technology,
    Fujian Entry-Exit Inspection and Quarantine Bureau, Fuzhou 350001, China
  • Online:2014-12-25 Published:2014-12-29

摘要:

人工合成78 个碱基的随机ssDNA文库,采用指数富集配基的系统进化技术与诱变聚合酶链式反应(polymerase chain reaction)结合的方法,通过筛选富集、克隆、测序,获得了与河豚毒素(tetrodotoxin,TTX)特异结合的单克隆DNA适配子A3。DNA适配子A3的二级结构主要为茎环结构,与TTX的亲和力为1.254。对适配子和TTX结合的磷酸盐缓冲液pH值、荧光染料结合时间进行优化,结果表明,最适pH值为7.5,最佳结合时间为10 min。建立的快速筛选检测TTX的DNA适配子-荧光染料法对TTX的检出限为10-6 mo1/L。

关键词: 河豚毒素, 适配子, 荧光染料, 检测

Abstract:

A 78-mer ssDNA library was synthesized in vitro. The tetrodotoxin (TTX) specific monoclonal DNA aptamer A3
was prepared using systematic evolution of ligands by exponential enrichment (SELEX) combined with mutagenic PCR by
screening, enrichment, cloning and sequencing. The secondary structure of the DNA aptamer A3 mainly contained stem ring
structure, and the affinity for tetrodotoxin was 1.254. The PBS buffer pH and fluorochrome-binding time were optimized.
The results showed that the optimum pH was 7.5 and the best binding time was 10 min. As a result, a DNA aptamerfluorochrome
method for rapidly screening and detecting tetrodotoxin was developed with a detection limit of 10-6 mo1/L.

Key words: tetrodotoxin, aptamer, fluorochrome, detection

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