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Nanobiocomposite Modified Carbon‐Ceramic Electrode Based on Nano‐TiO 2 ‐Plant Tissue and Its Application for Electrocatalytic Oxidation of Dopamine
Author(s) -
Majidi Mir Reza,
AsadpourZeynali Karim,
Gholizadeh Sima
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000008
Subject(s) - amperometry , chronoamperometry , electrode , materials science , ceramic , carbon paste electrode , cyclic voltammetry , carbon fibers , chemical engineering , detection limit , inorganic chemistry , chemistry , electrochemistry , chromatography , composite material , composite number , engineering
A new modified carbon‐ceramic electrode was prepared by incorporating TiO 2 nanoparticle into sol‐gel network by accompanying apple tissue. A mixture of fine graphite powder with 15 wt% of TiO 2 nanoparticle was used for the preparation of the carbon matrix and finally modification with a known amount weighted of apple tissue. The apple tissue containing polyphenol oxidase enzyme acts as molecular recognition element. The electrocatalytic oxidation of dopamine was investigated on the surface of the nanobiocomposite modified carbon‐ceramic electrode using cyclic voltammetry, chronoamperometry and amperometry techniques. Effect of pH, scan rate, TiO 2 percentage on the response of modified electrode was studied. The prepared modified electrode presented a linear range for dopamine from 5.0×10 −6 to 1.2×10 −3 M in buffered solutions with pH 7.4 by amperometry. The detection limit was 3.41×10 −6 M dopamine. The response of the modified carbon‐ceramic electrode and unmodified carbon‐ceramic electrode was compared.