A novel self-assembled gold nanoparticles-molecularly imprinted modified carbon ionic liquid electrode with high sensitivity and selectivity for the rapid determination of bisphenol A leached from plastic containers

Abstract

Abstract In the present work, a new nanocomposite, reduced graphene oxide (rGO) decorated by mercaptamine- gold nanoparticles (AuNPs-MCA-rGO) was synthesized for the first time by a facile hydrothermal method. The carbon ionic liquid electrode (CILE) was modified by AuNPs-MCA-rGO and molecular imprinted polymer (MIP) to sensitive and selective electrochemical microanalysis of bisphenol A (BPA). The modifier provides a large surface area, selective sites and exhibited a rapid electron transport rate for the bisphenol A (BPA). In this research, a new electrochemical microcell with a volume of 25\xa0µL was fabricated which can reduce drastically the required volume of analysis. This advantage leads to less use of chemicals and the possibility of micro sample analyzing. Therefore, the method is presented as a economical electro-analytical method. Under the optimized conditions, the linear response was observed for BPA concentration in the range of 4.0×10−9 to 1.8×10−5 M by cyclic voltammetry (CV). The detection limit of the method was obtained as 1.1×10−9 M by CV. Because of imprinted polymers in composition of modifier, the proposed sensor shows great potential applications in biomarker detection, food safety testing and environmental monitoring. It was used for the quantitative determination of BPA leached from plastic containers for food storage (PVC food package, PC baby bottle, and PC water bottle).