生物传感器
对氧磷
光电流
石墨烯
检出限
敌敌畏
纳米复合材料
生物分子
电极
材料科学
光电化学
纳米技术
化学
杀虫剂
色谱法
乙酰胆碱酯酶
光电子学
电化学
有机化学
酶
物理化学
生物
农学
作者
Xinyu Li,Zhaozhu Zheng,Xuefeng Li,Shenlong Zhao,Shaoqin Liu
标识
DOI:10.1016/j.bios.2014.08.006
摘要
A sensitive photoelectrochemical (PEC) biosensor for detection of organophosphorus pesticides (OPs) using the nanocomposite of [email protected] quantum dots (QDs) and graphene deposited on the ITO coated glass electrode as a photoactive electrode is presented. The integration of [email protected]/graphene nanocomposite with biomolecules acetylcholinesterase (AChE) as a biorecognition element yields a novel biosensing platform. Under visible light irradiation, the AChE–[email protected]/graphene nanocomposite can generate a stable photocurrent and the photocurrent is found to be inversely dependent on the concentration of OPs. Under the optimal experimental conditions, the photocurrents were proportional to the logarithm of paraoxon and dichlorvos within the concentration range of 10−12–10−6 M. The detection limits (LOD) of the proposed biosensor for paraoxon and dichlorvos are as low as 10−14 M and 10−12 M. The photoelectrochemical biosensor shows good sensitivity, reproducibility, stability, and could be successfully applied to detection of OPs in real fruit samples.
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