基于双功能HCR介导的多价值吸收体和无放大CRISPR/Cas12a系统的高度敏感的沙门氏菌检测
Zhaohui Qiao1, Liangliang Xue1, Mengni Sun1
1Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, 315800, China.
Analytica chimica acta
|November 23, 2023
概括
一种新的沙门氏菌检测方法使用aptamer磁分离和CRISPR/Cas12a进行超敏感,无放大结果. 这种快速技术可以改善食品安全监测,并有可能用于临床诊断.
科学领域:
- 生物技术是生物技术.
- 分子生物学分子生物学
- 食品科学 食品科学 食品科学
背景情况:
- 沙门氏菌感染对公众健康和经济造成重大负担.
- 现有的沙门氏甲型菌检测方法,如基于培养的测定,PCR和ELISA,具有局限性,包括耗时,需要复杂的程序或缺乏灵敏度.
- 迫切需要快速,简单和高度敏感的方法来检测食品中的沙门氏菌,以确保安全并防止污染.
研究的目的:
- 开发一种新的,无放大功率的方法,用于超敏感检测沙门氏菌.
- 通过将基于aptamer的磁分离与CRISPR/Cas12a系统相结合,提高沙门氏菌检测的灵敏度和特异性.
- 为食品安全监测和潜在的临床诊断提供一个多功能平台.
主要方法:
- 制造一种双功能杂交连锁反应 (HCR) - 脚手架多价值体 (HCR-multiApt) 通过将沙门氏菌特异的体组装到HCR产品上.
- 使用HCR-multiApt进行向细菌的磁性分离,利用其高结合亲和力和特异性.
- 使用CRISPR/Cas12a系统来检测被捕获的细菌,通过光读出触发信号放大信号的跨裂变活动.
主要成果:
- 开发的方法实现了超灵敏的沙门氏菌检测在线性范围从10^0到10^7殖民地形成单位 (cfu) 每毫升.
- 取得了令人印象深刻的2 cfu/mL的检测极限 (LOD),显示出高灵敏度.
- 双功能的HCR-multiApt有效地提高了aptamer结合亲和力,并以无放大方式促进了级联信号放大.
结论:
- 新型HCR-multiApt与CRISPR/Cas12a相结合,提供了一种简单而强大的策略,可以显著提高沙门氏菌检测灵敏度.
- 这种无放大方法为沙门氏菌监测提供了一种高度敏感和特定的方法.
- 基于aptamer的系统的多功能性允许其潜在扩展到检测其他细菌,更广泛的食品安全应用和临床诊断.
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