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环介导等温扩增联合横向流动试纸条快速检测创伤弧菌检测方法的建立

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Keywords: 创伤弧菌,外膜蛋白TolC基因,环介导等温扩增技术,横向流动试纸条检测

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Abstract:

环介导等温扩增技术(LAMP)与横向流动试纸条(LFD)检测联合应用,建立了一种新的快速、便捷的创伤弧菌检测方法。针对创伤弧菌的外膜蛋白TolC基因设计6条特异性引物和1条异硫氰酸荧光素(FITC)标记的探针。生物素标记的LAMP扩增产物能够特异性地与FITC标记的探针杂交,杂交产物经LFD检测。优化后的扩增温度和时间为63℃反应35min,加上细菌基因组DNA提取步骤,完成检测仅需要80min。LAMP-LFD方法可特异性地检出创伤弧菌,对哈维氏弧菌等9种水产品常见病原菌的检测均呈阴性;对纯细菌培养物的检测灵敏度为3.7×102CFU/mL或7.4CFU/反应,是利用外引物建立的常规PCR检测的100倍。结果表明,该方法能够准确、快速、灵敏地检出创伤弧菌,可应用于创伤弧菌污染的水产品的检测。

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