食品科学 ›› 2022, Vol. 43 ›› Issue (20): 44-52.doi: 10.7506/spkx1002-6630-20210917-203

• 食品化学 • 上一篇    下一篇

酰肼介导的抗体定向偶联策略提高免疫层析试纸条检测性能

周梦君,周舒,黄小林,李响敏,熊勇华   

  1. (1.南昌大学 食品科学与技术国家重点实验室,江西 南昌 330047;2.南昌大学食品学院,江西 南昌 330031)
  • 出版日期:2022-10-25 发布日期:2022-10-26
  • 基金资助:
    “十三五”国家重点研发计划重点专项(2018YFC1602202;2018YFC1602203;2018YFC1602505); 国家自然科学基金地区科学基金项目(31760485);国家自然科学基金青年科学基金项目(31901780)

Hydrazide-Assisted Directional Antibody Conjugation of Gold Nanoparticles to Enhance the Performance of Immunochromatographic Assay

ZHOU Mengjun, ZHOU Shu, HUANG Xiaolin, LI Xiangmin, XIONG Yonghua   

  1. (1. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China;2. College of Food Science and Technology, Nanchang University, Nanchang 330031, China)
  • Online:2022-10-25 Published:2022-10-26

摘要: 以酰肼功能团修饰的胶体金作为试纸条的标记材料,利用酰肼基团可特异性地与抗体Fc片段醛基发生亲核加成反应的特性,实现抗体在胶体金纳米粒子(gold nanoparticles,AuNPs)表面的定向偶联。对比于碳二亚胺介导的共价偶联法,酰肼功能团介导的定向偶联需要更少的抗体标记量,更短的偶联时间,酰肼化胶体金免疫层析试纸条(hydrazided gold nanoparticles-based immunochromatographic assay,hAuNPs-ICA)检测玉米赤霉烯酮(zearalenone,ZEN)展示出更好的检测灵敏度;将hAuNPs-ICA检测ZEN加标的玉米样品,结果显示加标回收率介于83.1%~118.0%,批内、批间变异系数为3.9%~13.1%,表明hAuNPs-ICA具有较好的精密度和准确性。

关键词: 免疫检测探针;酰肼;定向偶联;胶体金纳米粒子;玉米赤霉烯酮

Abstract: Anti-zearalenone monoclonal antibodies (mAbs) were directionally conjugated on the surface of hydrazide group-functionalized gold nanoparticles because of the nucleophilic addition reaction between the aldehyde groups of the antibody Fc region and the hydrazide groups on gold nanoparticles (AuNPs). Compared with the carbodiimide-mediated covalent coupling method, the proposed directional coupling strategy showed several advantages such as use of less amounts of labeled antibody and shorter reaction time. The hydrazided gold nanoparticles-based immunochromatographic assay (hAuNPs-ICA) showed higher sensitivity for ZEN detection. Additionally, when hAuNPs-ICA was used to analyze ZEN-spiked maize samples, the average recoveries ranged from 83.1% to 118.0% with intra- and inter-batch coefficients of variation ranging from 3.9% to 13.1%, indicating good accuracy and precision.

Key words: immunoprobe; hydrazide; directional coupling; colloidal gold nanoparticles; zearalenone

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