title: Au-TiO2/Chit modified sensor for electrochemical detection of trace organophosphates insecticides.
abstract: In this paper, Au-TiO2/Chit modified electrode was prepared with Au-TiO2 nanocomposite (Au-TiO2) and Chitosan (Chit) as a conjunct. The Au-TiO2 nanocomposite and the films were characterized by electrochemical and spectroscopy methods. A set of experimental conditions was also optimized for the film's fabrication. The electrochemical and electrocatalytic behaviors of Au-TiO2/Chit modified electrode to trace organophosphates (OPs) insecticides such as parathion were discussed in this work. By differential pulse voltammetry (DPV) measurement, the current responses of Au-TiO2/Chit modified electrode were linear with parathion concentration ranging from 1.0 ng/ml to 7.0 x 10(3)ng/ml with the detection limit of 0.5 ng/ml. In order to evaluate the performance of the detection system, we also examined the real samples successfully in this work. It exhibited a sensitive, rapid and easy-to-use method for the fast determination of trace OPs insecticides.
authors.affiliation: Department of Chemistry, East China Normal University, Zhongshan Road (N), Shanghai 200062, PR China.
authors.forename: Yunhe
authors.initials: Y
authors.lastname: Qu
authors.forename: Hong
authors.initials: H
authors.lastname: Min
authors.forename: Yinyin
authors.initials: Y
authors.lastname: Wei
authors.forename: Fei
authors.initials: F
authors.lastname: Xiao
authors.forename: Guoyue
authors.initials: G
authors.lastname: Shi
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Li
authors.forename: Litong
authors.initials: L
authors.lastname: Jin
mesh_terms: D015374:Biosensing Techniques / Q000379:methods; D048271:Chitosan / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004867:Equipment Design; D006046:Gold / Q000737:chemistry*; D007306:Insecticides / Q000032:analysis* / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry; D010755:Organophosphates / Q000032:analysis* / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D007306:Insecticides; D010755:Organophosphates; C009495:titanium dioxide; D006046:Gold; D048271:Chitosan; D014025:Titanium