食品科学 ›› 2026, Vol. 47 ›› Issue (1): 8-16.doi: 10.7506/spkx1002-6630-20250829-210

• 食品安全快速检测专栏 • 上一篇    

基于地高辛修饰的核酸适配体层析试纸条快速检测玉米中赭曲霉毒素A

李行言,任文洁,王玉龙,王志华,韩雨秀,李佳妮,任凯婵,何保山   

  1. (1.河南工业大学粮油食品学院,河南 郑州 450001;2.江苏省农业科学院,江苏 南京 210014)
  • 发布日期:2026-02-04
  • 基金资助:
    河南工业大学“双一流”本科生科技创新能力提升专项(HN-HautFood IAEG-015); 国家自然科学基金青年科学基金项目(32402234);河南省科技开发联合基金项目(225200810065); 河南省教育厅项目(25B550002)

Rapid Detection of Ochratoxin A in Corn Using a Digoxin-Modified Aptamer-Based Lateral Flow Test Strip

LI Xingyan, REN Wenjie, WANG Yulong, WANG Zhihua, HAN Yuxiu, LI Jiani, REN Kaichan, HE Baoshan   

  1. (1. College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, China;2. Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China)
  • Published:2026-02-04

摘要: 为建立快速、灵敏的检测赭曲霉毒素A(ochratoxin A,OTA)的方法,通过冷冻法将胶体金与互补链进行偶联作为金标探针(AuNPs-SH-cDNA)固定于结合垫上,抗地高辛单克隆抗体和适配体分别作为T线和C线固定于硝酸纤维素膜上,地高辛修饰的核酸适配体作为识别元件用于结合上样缓冲液中的OTA。在最优条件下,该方法的检出限值为0.3 ng/mL,半数抑制浓度为12.5 ng/mL,该试纸条对玉米样品的加标回收率在100.82%~106.30%之间,变异系数在2.54%~6.78%之间,假阳性率≤0%、假阴性率≤1%。本研究制备的层析试纸条能够成为玉米中OTA检测的有效方法,具有良好的应用前景。

关键词: 适配体;地高辛;层析试纸条;赭曲霉毒素A

Abstract: To establish a rapid and sensitive method for detecting ochratoxin A (OTA), a lateral flow test strip was developed using a gold nanoparticle-cDNA conjugate (AuNPs-SH-cDNA) by a freezing method as the detector probe on the conjugate pad as well as using anti-digoxin monoclonal antibodies as the test line and aptamers as the control line on the nitrocellulose membrane. Digoxin-modified aptamers (Dig-Apt) were used as recognition elements for binding to OTA in the loading buffer. Under optimal conditions, the limit of detection (LOD) of the method was 0.3 ng/mL, and the half-maximal inhibitory concentration (IC50) was 12.5 ng/mL. The recoveries in spiked corn samples ranged from 100.82% to 106.30%, with coefficients of variation between 2.54% and 6.78%, a false positive rate ≤ 0% and a false negative rate ≤ 1%. The developed test strip provides an effective method for detecting OTA in corn, demonstrating promising application potential.

Key words: aptamer; digoxin; chromatographic test strip; ochratoxin A

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