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一种基于光DNA传感器的目标诱导多组件核酶介导的催化针组件的新型放大策略

Hongyan Xu¹, Chengui Xiao², Fengjuan Zhao²

¹College of Food Science and Technology, Henan Key Laboratory of Cereal and Oil Food Safety and Nutrition, Henan University of Technology, Zhengzhou 450001, China.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy

|March 7, 2025

概括

一个新的无酶光传感器可以检测食品中的Ochratoxin A (OTA). 这种方法使用多组件核酶 (MNAzyme) 和发针组件进行敏感和可靠的OTA检测,提高食品安全.

科学领域:

分析化学分析化学
食品科学食品科学食品科学
生物技术是生物技术.

背景情况:

毒素A (OTA) 是食品中普遍存在且危险的真菌毒素.
准确而敏感的OTA检测方法对于食品安全至关重要.
现有的方法可能缺乏灵敏度,可靠性或成本效益.

研究的目的:

为OTA开发一种简单,无酶,高度敏感的光检测策略.
建立一种可靠且具有成本效益的方法,用于在食品矩阵中进行OTA分析.
为了利用磁分离辅助的多组件核酶 (MNAzyme) 和催化针组件 (CHA) 来进行信号放大.

主要方法:

使用磁性分离系统来帮助形成活性MNA酶.
该MNAzyme专门切断了头发针H1,释放了DNA片段 (sDNA).
sDNA启动了催化针组装 (CHA) 周期,导致显著的光信号放大.

主要成果:

开发的光感应器显示了广泛的线性范围 (0.5-100 ng/mL).
对于OTA. 实现了0.45 ng/mL的低检测极限.
传感器在真实食品样本中成功检测到OTA,包括玉米面粉和黑茶.

结论:

开发的无酶光策略为OTA检测提供了一种敏感,可靠和具有成本效益的方法.
该MNAzyme-CHA系统为食感器应用提供高效的信号放大.
这种方法对食品中OTA的常规监测具有前景,以确保消费者安全.

关键词:

级联放大器的级联放大器催化式发针组件组件催化式发针组件光生物传感器的生物传感器甲基酶MNA酶的使用方法

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