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Citation: Zhu Yimin, Zhang Wenbin, Dong Shaojun. ELECTRODE PROCESS OF HEMOGLOBIN PORMOTED BY POLYPYRROLE AND POLYPYRROLE CONTAINING METHYLENE GREEN MODIFIED ELECTRODES[J]. Chinese Journal of Applied Chemistry, ;1992, 9(2): 51-55. shu

ELECTRODE PROCESS OF HEMOGLOBIN PORMOTED BY POLYPYRROLE AND POLYPYRROLE CONTAINING METHYLENE GREEN MODIFIED ELECTRODES

1.
Laboratory of Electroanalytical Chemistry, Changchun Insitute of Applied Chemistry, Academia sinica, Changchun 130022

Corresponding author: Dong Shaojun,
Received Date: 26 March 1991
Available Online: 11 July 1991
Fund Project:

Polypyrrole (PPy) and polypyrrole containng Methylene Green (MG/PPy)thin-film modified electrodes prepared by electrochemical polymerization may promote heterogeneous electron transfer process of hemoglobin. Using optical thin-layer spectroelectrochemical techniques some electrochemical parameters of hemoglobin on PPy and MG/PPy modified electrode were determined as follows:the electron transfer number n=1.88,formal electrode potential E°'=-0.081V (vs Ag/AgCl) and the heterogeneous electron transfer rate constant k_s=1.75×10^-5cm/S. The mechanism for the electron transfer reaction of hemoglobin at polypyrrole modified electrode includes:first,the polypeptide chains of hemoglobin were got out of shape by pyrrole, as a result, heme groups were in part exposed; second, owing to the interaction between pyrrole and heme iron, Fe(Ⅱ)was lowered into the porphyrin ring.
- hemoglobin,
- polypyrrole modified electrode,
- methylene green,
- spectroelectrochemical technique,
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