title: Label-free amperometric immunosensor based on prussian blue as artificial peroxidase for the detection of methamphetamine.
abstract: A label-free amperometric immunosensor for the detection of methamphetamine was developed. The prussian blue deposited/l-cystine-modified electrode was covered with nano-Au/(3-mercaptorpropyl) trime-thoxysilane film. Then, the nano-Au was used for the immunosensor platform to capture a large amount of anti-methamphetamine. PB exhibited excellent electrocatalytical properties toward the reduction of H2O2 at low overpotentia to amplify the amperometric signal, which enhanced the sensitivity of the immunosensor. The active sites of PB could be shielded and the access of H2O2 from solution to the electrode might be partially blocked after the completion of immunoassay, led to a linear decrease in the response current of the electrode over the range from 1.0×10(-8) to 5.0×10(-6) mol L(-1)of MA. The obtained immunosensor displayed excellent catalytic reduction toward H2O2 due to high activity and selectivity of PB. The influence of relevant experimental variables, including the construction of immunosensor platform, the amount of MPS and the time of immunoaction, was examined and optimized.
authors: Chongqing Institutions of Higher Learning Center of Forensic Science Engineering and Research, College of Criminal Investigation, Southwest University of Political Science and Law, Chongqing 401120, China; College of Criminal Investigation, Northwest University of Politics and Law, Shanxi Province 710122, China. Electronic address: zly100@126.com.
authors: Ling-Yan
authors: LY
authors: Zhang
authors: Chongqing Institutions of Higher Learning Center of Forensic Science Engineering and Research, College of Criminal Investigation, Southwest University of Political Science and Law, Chongqing 401120, China; College of Criminal Investigation, Northwest University of Politics and Law, Shanxi Province 710122, China.
authors: Yan-Jun
authors: YJ
authors: Liu
mesh_terms: D000906:Antibodies / Q000276:immunology; D001672:Biocompatible Materials / Q000737:chemistry / Q000378:metabolism*; D002384:Catalysis; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D055664:Electrochemical Techniques; D004566:Electrodes; D005295:Ferrocyanides / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D007118:Immunoassay; D053768:Metal Nanoparticles / Q000737:chemistry; D008694:Methamphetamine / Q000032:analysis* / Q000276:immunology; D010084:Oxidation-Reduction; D009195:Peroxidase / Q000737:chemistry / Q000378:metabolism
chemical_list: D000906:Antibodies; D001672:Biocompatible Materials; D005295:Ferrocyanides; D008694:Methamphetamine; D006046:Gold; D006861:Hydrogen Peroxide; D009195:Peroxidase; C000170:ferric ferrocyanide
keywords: (3-Mercaptorpropyl)trime-thoxysilane; Amperometric immunosensor; Label free; Methamphetamine; Prussian blue