title: Electrochemical synthesis of polyaniline nano-network on alpha-alanine functionalized glassy carbon electrode and its application for the direct electrochemistry of horse heart cytochrome c.
abstract: Polyaniline (PAN) nano-particles, nano-fibrils, and nano-network have been synthesized via electrochemical polymerization of aniline using a three-step electrochemical deposition procedure on alpha-alanine (ALA)-monolayer functionalized glassy carbon electrode (GCE). The structure and properties of PAN nano-structures have been characterized using field emission scanning electron microscope (SEM), Fourier transform infrared spectra (FT-IR), and electrochemical techniques. The 3-dimensional (3D) PAN nano-network/ALA composite film coated GCE (PAN-ALA/GCE) leads to the direct electrochemistry of horse heart cytochrome c (Cyt c) immobilized on this electrode surface. The immobilized Cyt c maintains its activity, showing a surface-controlled electrode process with the electron transfer rate constant (k(s)) of 21.9s(-1) and the charge-transfer coefficient (alpha) of 0.37, and could be used for the electrocatalytic reduction of hydrogen peroxide (H(2)O(2)). The steady-state current response increases linearly with H(2)O(2) concentration from 2.5 x 10(-5) to 3.0 x 10(-4) moll(-1). The detection limit (3delta) is 8.2 x 10(-6) moll(-1).
authors.affiliation: Department of Chemistry, College of Life and Environment Sciences, Shanghai Normal University, Guilin Road No. 100, Shanghai 200234, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Chunhua
authors.initials: C
authors.lastname: Zhang
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D000818:Animals; D015374:Biosensing Techniques / Q000295:instrumentation; D002244:Carbon / Q000737:chemistry*; D045304:Cytochromes c / Q000032:analysis*; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006736:Horses; D009206:Myocardium / Q000201:enzymology*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000814:Aniline Compounds; C416807:polyaniline; D002244:Carbon; D045304:Cytochromes c