Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7230136 | Biosensors and Bioelectronics | 2016 | 22 Pages |
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 1-1000 nmol Lâ1 with a detection limit of 0.5 nmol Lâ1. 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.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Yunfei Qiao, Jing Li, Hongbo Li, Hailin Fang, Dahe Fan, Wei Wang,