An electrochemical aptasensor based on gold nanoparticles dotted graphene modified glassy carbon electrode for label-free detection of bisphenol A in milk samples

• Published in: Food chemistry Vol. 162; pp. 34 - 40
• Main Authors: Zhou, Ling, Wang, Jianping, Li, Dujuan, Li, Yanbin
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2014; Elsevier
• Subjects: Animals; Aptamer; Benzhydryl Compounds - chemistry; Biological and medical sciences; Bisphenol A; Carbon; Chemical and industrial products toxicology. Toxic occupational diseases; Electrochemical biosensor; Electrodes; Food toxicology; Glassy carbon; Gold; Gold - chemistry; Gold nanoparticles dotted graphene; Graphene; Graphite - chemistry; Medical sciences; Metals and various inorganic compounds; Milk; Milk - chemistry; Nanoparticles; Nanoparticles - chemistry; Nanostructure; Phenols - chemistry; Scanning electron microscopy; Toxicology; Bisphenol A; Electrochemical biosensor; Aptamer; Gold nanoparticles dotted graphene; Gold; Sample; Carbon electrode; Epoxy resin; Transition metal; Endocrine disruptor; Ultrafine particle; Analysis method; Biosensor; Control method; Detection; Milk
• DOI: 10.1016/j.foodchem.2014.04.058
• ISSN: 0308-8146

•Aptamer biosensor for BPA based on label-free electrochemical determination.•Simple and easy to use for small size molecules assays.•GNPs/GR nanocomposites were used as effective sensing platform.•Method demonstrated successful quantification of BPA in milk samples. A simple and label-free electrochemical aptasensor for bisphenol A (BPA) determination was developed based on gold nanoparticles dotted graphene (GNPs/GR) nanocomposite film modified glassy carbon electrode (GCE). The electrochemical probe of ferricyanide was used to investigate the interactions between aptamer and BPA. The resulting GNPs/GR layer exhibited good current response for BPA detection. The highly conductive and biocompatible nanostructure of GNPs/GR nanocomposite was characterised by atomic force microscope (AFM), scanning electron microscopy (SEM) and cyclic voltammetry (CV). The peak current change (ΔI) of ferricyanide was linear with the concentration of BPA in the range from 0.01μM to 10μM with the detection limit of 5nM. The proposed aptasensor is rapid, convenient and low-cost for effective sensing of BPA. Particularly, the aptasensor was applied successfully to determine BPA in milk products, and the average recovery was 105%.