食品科学 ›› 2021, Vol. 42 ›› Issue (24): 318-322.doi: 10.7506/spkx1002-6630-20200907-091

• 安全检测 • 上一篇    

基于氧化石墨烯的荧光适配体传感器检测食品中真菌毒素

王琦,杨庆利,吴薇   

  1. (青岛农业大学食品科学与工程学院,山东 青岛 266109)
  • 发布日期:2021-12-30
  • 基金资助:
    山东省高等学校青创人才引育团队项目(2019-135);国家自然科学基金青年科学基金项目(81703228); “十三五”国家重点研发计划重点专项(2016YFD0400105);中国博士后科学基金项目(2019M652320)

A Graphene Oxide-Based Fluorescent Aptasensor for Determination of Mycotoxins in Foods

WANG Qi, YANG Qingli, WU Wei   

  1. (College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China)
  • Published:2021-12-30

摘要: 目的:利用核酸适配体(aptamer,APT)和氧化石墨烯(graphene oxide,GO)组装一种基于荧光共振能量转移原理的荧光适体传感器,用于两种真菌毒素的同时检测。方法:GO通过π-π堆积作用将荧光标记的黄曲霉毒素B1(aflatoxin B1,AFB1)APT1和伏马毒素B1(fumonisin B1,FB1)APT2吸附在其表面。由于荧光共振能量转移效应,APT上荧光基团的荧光被GO猝灭;当向溶液中加入靶标AFB1和FB1时,APT1和APT2分别与AFB1和FB1结合,从GO中游离出来,恢复荧光。结果:该传感器为AFB1和FB1的荧光检测提供快速、灵敏的方法,AFB1的检出限为0.15?ng/mL,FB1的检出限为0.12?ng/mL。同时对白酒样品进行加标回收实验,回收率分别为92.00%~100.81%(AFB1)和89.00%~99.50%(FB1)。结论:本研究构建的荧光APT传感器用于两种真菌毒素的同时检测具有高灵敏度和特异性,同时该APT传感器同样适用于其他真菌毒素的多重检测。

关键词: 适配体传感器;氧化石墨烯;荧光检测;黄曲霉毒素B1;伏马毒素B1

Abstract: Objective: Herein, a novel fluorescent aptasensor based on fluorescence resonance energy transfer (FRET) was assembled with aptamer and graphene oxide (GO) for simultaneous detection of two mycotoxins. Methods: Fluorescence-labeled aflatoxin B1 (AFB1) aptamers (APT1) and fumonisin B1 (FB1) aptamers (APT2) were adsorbed on the surface of GO by π-π stacking. The fluorescence of the fluorescent groups in aptamers was quenched by GO via FRET. APT1 and ATP2 were combined with AFB1 and FB1, respectively, enabling them to be dissociated from the surface of GO and consequently restoring fluorescence. Results: The aptasensor could provide a fast and sensitive method for the detection of AFB1 and FB1. The detection limit of AFB1 was 0.15 ng/mL, and the detection line of FB1 was 0.12 ng/mL. The recoveries of AFB1 and FB1 in spiked Chinese Baijiu samples were 92.00%–100.81% and 89.00%–99.50%. Conclusion: The fluorescent aptasensor is high sensitive and specific for the simultaneous detection of the two mycotoxins, and it is also suitable for multiplex detection of other mycotoxins.

Key words: aptasensor; graphene oxide; fluorescence detection; aflatoxin B1; fumonisin B1

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