• 文献标题:   Monitoring of Aflatoxin M1 in milk using a novel electrochemical aptasensor based on reduced graphene oxide and gold nanoparticles
  • 文献类型:   Article
  • 作  者:   AHMADI SF, HOJJATOLESLAMY M, KIANI H, MOLAVI H
  • 作者关键词:   aptamerbased sensor, aflatoxin m1, labelfree electrochemical aptasensor, aunpsbased aptasensor, pencil graphite electrode
  • 出版物名称:   FOOD CHEMISTRY
  • ISSN:   0308-8146 EI 1873-7072
  • 通讯作者地址:  
  • 被引频次:   18
  • DOI:   10.1016/j.foodchem.2021.131321 EA OCT 2021
  • 出版年:   2022

▎ 摘  要

Accurate and rapid detection of Aflatoxins as one of the most hazardous compounds in foodstuffs is very important. In this study, a label-free electrochemical aptasensor was developed to identify aflatoxin M1 using a reduced graphene oxide (rGO) and gold nanoparticles (AuNPs)-based pencil graphite electrode (PGE). The morphological characteristics of the electrode surface were investigated using SEM and rGO functional groups were confirmed by FTIR. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques were used to characterize various stages of electrode modification. In order to optimize the impedimetric response of the aptasensor, aptamer immobilization time, aptamer concentration, and binding aflatoxin M1 with aptamer time were optimized. Under optimal conditions, the linear concentration range of 0.5-800 ng/L and limit of detection (LOD) of 0.3 ng/L were obtained for aflatoxin M1 by measuring the resistance charge transfer data. Finally, the fabricated aptasensor was successfully used to measure AFM1 compared to HPLC method.