title: A label-free electrochemical immunosensor for carbofuran detection based on a sol-gel entrapped antibody.
abstract: In this study, an anti-carbofuran monoclonal antibody (Ab) was immobilized on the surface of a glassy carbon electrode (GCE) using silica sol-gel (SiSG) technology. Thus, a sensitive, label-free electrochemical immunosensor for the direct determination of carbofuran was developed. The electrochemical performance of immunoreaction of antigen with the anti-carbofuran monoclonal antibody was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), in which phosphate buffer solution containing [Fe(CN)(6)](3-/4-) was used as the base solution for test. Because the complex formed by the immunoreaction hindered the diffusion of [Fe(CN)(6)](3-/4-) on the electrode surface, the redox peak current of the immunosensor in the CV obviously decreased with the increase of the carbofuran concentration. The pH of working solution, the concentration of Ab and the incubation time of carbofuran were studied to ensure the sensitivity and conductivity of the immunosensor. Under the optimal conditions, the linear range of the proposed immunosensor for the determination of carbofuran was from 1 ng/mL to 100 μg/mL and from 50 μg/mL to 200 μg/mL with a detection limit of 0.33 ng/mL (S/N = 3). The proposed immunosensor exhibited good high sensitivity and stability, and it was thus suitable for trace detection of carbofuran pesticide residues.
authors.affiliation: School of Agriculture and Food Engineering, Shandong University of Technology, NO.12, Zhangzhou Road, Zibo 255049, Shandong Province, China. sunxia2151@sina.com
authors.forename: Xia
authors.initials: X
authors.lastname: Sun
authors.forename: Shuyuan
authors.initials: S
authors.lastname: Du
authors.forename: Xiangyou
authors.initials: X
authors.lastname: Wang
authors.forename: Wenping
authors.initials: W
authors.lastname: Zhao
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Li
mesh_terms: D000906:Antibodies / Q000276:immunology*; D015374:Biosensing Techniques / Q000295:instrumentation*; D001937:Brassica / Q000737:chemistry; D002138:Calibration; D002235:Carbofuran / Q000032:analysis*; D002244:Carbon / Q000737:chemistry; D058266:Dielectric Spectroscopy; D055664:Electrochemical Techniques / Q000295:instrumentation* / Q000379:methods*; D004566:Electrodes; D005898:Glass / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D055767:Immobilized Proteins / Q000276:immunology*; D007306:Insecticides / Q000032:analysis; D018545:Lactuca / Q000737:chemistry; D044367:Phase Transition; D013194:Staining and Labeling
chemical_list: D000906:Antibodies; D055767:Immobilized Proteins; D007306:Insecticides; D002244:Carbon; D002235:Carbofuran