title: Myoglobin immobilization on electrodeposited nanometer-scale nickel oxide particles and direct voltammetry.
abstract: Prosperity of information on the reactions of redox-active sites in proteins can be attained by voltammetric studies in which the protein sample is located on a suitable surface. This work reports the presentation of myoglobin/nickel oxide nanoparticles/glassy carbon (Mb/NiO NPs/GC) electrode, ready by electrochemical deposition of the NiO NPs on glassy carbon electrode and myoglobin immobilization on their surfaces by the potential cycling method. Images of electrodeposited NiO NPs on the surface of glassy carbon electrode were obtained by scanning electron microscopy (SEM) and atomic force microscopy (AFM). A pair of well-defined redox peaks for Mb(Fe(III)-Fe(II)) was obtained at the prepared electrode by direct electron transfer between the protein and nanoparticles. Electrochemical parameters of immobilized myoglobin such as formal potential (E(0')), charge transfer coefficient (alpha) and apparent heterogeneous electron transfer rate constant (k(s)) were estimated by cyclic voltammetry and nonlinear regression analysis. Biocatalytic activity was exemplified at the prepared electrode for reduction of hydrogen peroxide.
authors.affiliation: Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, P. O. Box 14155-6455, Tehran, Iran.
authors.forename: Abdolmajid Bayandori
authors.initials: AB
authors.lastname: Moghaddam
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ganjali
authors.forename: Rassoul
authors.initials: R
authors.lastname: Dinarvand
authors.forename: Sara
authors.initials: S
authors.lastname: Ahadi
authors.forename: Ali Akbar
authors.initials: AA
authors.lastname: Saboury
mesh_terms: D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D004566:Electrodes; D004595:Electroplating; D006861:Hydrogen Peroxide / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D009211:Myoglobin / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D011485:Protein Binding
chemical_list: D009211:Myoglobin; D002244:Carbon; D009532:Nickel; D006861:Hydrogen Peroxide; C028007:nickel monoxide