title: A label-free photoelectrochemical aptasensor for bisphenol A based on surface plasmon resonance of gold nanoparticle-sensitized ZnO nanopencils.
abstract: A simple and novel photoelectrochemical (PEC) aptasensor for selective detection of bisphenol A (BPA) was developed using surface plasmon resonance of Au nanoparticles activated ZnO nanopencils. With the irradiation of simulated light, the increased photocurrent of nano-Au/ZnO than that of pure ZnO nanopencil is induced by the hot electrons from excited Au nanoparticles. The perfect selectivity is attributed to the specific binding of BPA to its aptamer. With the addition of BPA, the conformation of aptamer changed to a G-quadruplex structure, which resulted in the blockages of photogenerated electron-transfer channels. Based on the above mechanisms and the optimized conditions, the assembled PEC aptasensor was linear with the concentration of BPA in the range of 1-1000nmolL(-1) with a detection limit of 0.5nmolL(-1). The presence of the same concentration and similar structure of other organics did not interfere in the detection of BPA and the recovery was between 96.2% and 108.4%. It has been successfully applied to the detection of BPA in drinking water and liquid milk samples. This PEC aptasensor has good performances in novelty, selectivity, sensitivity and low cost, and it provides an alternative approach to the detection of BPA.
authors.affiliation: School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, 211 East Jianjun Road, Yancheng 224051, PR China; School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Qiao
authors.affiliation: School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, 211 East Jianjun Road, Yancheng 224051, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, 211 East Jianjun Road, Yancheng 224051, PR China. Electronic address: hbli@ycit.edu.cn.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, 211 East Jianjun Road, Yancheng 224051, PR China.
authors.forename: Hailin
authors.initials: H
authors.lastname: Fang
authors.affiliation: School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, 211 East Jianjun Road, Yancheng 224051, PR China.
authors.forename: Dahe
authors.initials: D
authors.lastname: Fan
authors.affiliation: School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, 211 East Jianjun Road, Yancheng 224051, PR China. Electronic address: wangw@ycit.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry*; D001559:Benzhydryl Compounds / Q000032:analysis* / Q000737:chemistry; D003217:Conductometry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005504:Food Analysis / Q000295:instrumentation; D005506:Food Contamination / Q000032:analysis; D006046:Gold / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry / Q000648:ultrastructure; D010636:Phenols / Q000032:analysis* / Q000737:chemistry; D010783:Photometry / Q000295:instrumentation; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013194:Staining and Labeling; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D015034:Zinc Oxide / Q000737:chemistry; D000098826:Bisphenol A Compounds
chemical_list: D052157:Aptamers, Nucleotide; D001559:Benzhydryl Compounds; D006046:Gold; D010636:Phenols; D015034:Zinc Oxide; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: Aptasensor; Au/ZnO nanopencil; Bisphenol A; Photoelectrochemistry; Surface plasmon resonance