title: Nafion/lead nitroprusside nanoparticles modified carbon ceramic electrode as a novel amperometric sensor for L-cysteine.
abstract: This work describes the electrochemical and electrocatalytic properties of carbon ceramic electrode (CCE) modified with lead nitroprusside (PbNP) nanoparticles as a new electrocatalyst material. The structure of deposited film on the CCE was characterized by energy dispersive X-ray (EDX), Fourier transform infrared (FTIR), and scanning electron microscopy (SEM). The cyclic voltammogram (CV) of the PbNP modified CCE showed two well-defined redox couples due to [Fe(CN)5NO](3-)/[Fe(CN)5NO](2-) and Pb(IV)/Pb(II) redox reactions. The modified electrode showed electrocatalytic activity toward the oxidation of L-cysteine and was used as an amperometric sensor. Also, to reduce the fouling effect of L-cysteine and its oxidation products on the modified electrode, a thin film of Nafion was coated on the electrode surface. The sensor response was linearly changed with L-cysteine concentration in the range of 1 x 10(-6) to 6.72 x 10(-5)mol L(-1) with a detection limit (signal/noise ratio [S/N]=3) of 0.46 microM. The sensor sensitivity was 0.17 microA (microM)(-1), and some important advantages such as simple preparation, fast response, good stability, interference-free signals, antifouling properties, and reproducibility of the sensor for amperometric determination of L-cysteine were achieved.
authors.affiliation: Electrochemistry Research Laboratory, Faculty of Sciences, Azarbaijan University of Tarbiat Moallem, P.O. Box 53714-161, Tabriz, Iran. h.razmi@azaruniv.edu
authors.forename: H
authors.initials: H
authors.lastname: Razmi
authors.forename: H
authors.initials: H
authors.lastname: Heidari
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002516:Ceramics / Q000737:chemistry*; D003545:Cysteine / Q000032:analysis*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D005465:Fluorocarbon Polymers / Q000737:chemistry; D005782:Gels / Q000737:chemistry; D007854:Lead / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009599:Nitroprusside / Q000737:chemistry*; D010084:Oxidation-Reduction; D015203:Reproducibility of Results
chemical_list: D005465:Fluorocarbon Polymers; D005782:Gels; D009599:Nitroprusside; D007854:Lead; C040402:perfluorosulfonic acid; D002244:Carbon; D003545:Cysteine