Journal
BIOSENSORS & BIOELECTRONICS
Volume 86, Issue -, Pages 315-320Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2016.06.062
Keywords
Photoelectrochemistry; Aptasensor; Surface plasmon resonance; Au/ZnO nanopencil; Bisphenol A
Categories
Funding
- Natural Science Foundation of China [21305123, 21505117, 21575123]
- Natural Science Foundation of Jiangsu Province [SBK2016020050, BK2012247, BK20131218]
- Industry University-Research Cooperative Innovation Foundation of Jiangsu Province [BY2014108-08, BY2014108-19]
- Foundation of International Cooperation of Jiangsu Province [BZ2010053]
- Foundation of Jiangsu Key Laboratory of Environmental Material and Environmental Engineering [K13064]
- Foundation of Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [AE201162, AE201017]
- Jiangsu Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments [GX2015103]
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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 L-1 with a detection limit of 0.5 nmol L-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. (C) 2016 Elsevier B.V. All rights reserved.
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