Abstract
The electrooxidation of 3,3′, 5,5′-tetramethylbenzidine (TMB) is dependent on the pH value of Britton-Robinson (B-R) buffer solution. In this work, the electrooxidation behavior of TMB was investigated with a SnO2:F film optically transparent thin-layer spectroelectrochemical cell. TMB underwent one two-electron electrooxidation process in the pH range from 2.0 to < 4.0, and two successive one-electron electrooxidation processes in the pH range from 4.0 to < 7.0 in the B-R buffer solution. At pH 6.5, the electrooxidative product of TMB generated a subsequent chemical reaction to yield an azo compound. Several spectroelectrochemical techniques, such as thin-layer cyclic voltammetry, thin-layer cyclic voltabsorptometry, thin-layer potential-controlled electrolysis absorptometry, thin-layer single-potential-step chronoabsorptometry, thin-layer double-potential-step chronoabsorptometry, thin-layer single-potential-step open-circuit relaxation chronoabsorptometry, were applied to this investigation. The formal potential E0′ and the electron transfer number corresponding to the electrooxidation of TMB in B-R buffer solution, and the reaction rate constant of the subsequent chemical reaction were determined.
Similar content being viewed by others
References
Wang Tong, Sun Wei, Jiao Kui, Studies on the voltammetric enzyme-linked immunoassay system based on 3,3′,5,5′-tetrame-thylbenzidine (TMB) as substrate, Chinese Journal of Analytical Chemistry (in Chinese), 2002, 30(11): 1298–1302.
He Yanan, Chen Hongyuan, 3,3′,5,5′-Tetramethylbenzidine (TMB)-H2O2-HRP voltammetric immunoassay for the determination of IgE in human serum, Chem. J. Chinese Universities (in Chinese), 1997, 18(8): 1306–1308.
Jiao Kui, Zhang Shusheng, Sun Wei, Authorization Certificate of Science and Technology of Shandong Province, 1999, No: 197.
Jiao Kui, Lu Gang, Yang Tao et al., Electrochemical and spectroelectrochemical study of m-phenylenediamine, Chem. J. Chinese Universities (in Chinese), 2003, 24(6): 1005–1008.
Mohr, P., Harke, T., Kuhn, W. et al., Mechanism studies of enzymatically formed tolidine blue and determination of peroxidatic activities, Biomed. Biochim. Acta, 1983, 42(6): 663–672.
Matrka, M., Pipalova, J., Semiquinone formation during the oxidation of benzidine, o-tolidine, and o-dianisidine, Chem. Prum., 1971, 21(1): 14–18.
Shen Baoen, Wang Guiliang, Thin-layer spectroelectrochemical investigation on indigo carmine, Acta Physico-Chimica Sinica (in Chinese), 1990, 6(1): 71–76.
Jiao Kui, Zhang Shusheng, Wei Lu et al., Investigation of voltammetric enzyme-linked immunoassay system based on new system of OT- H2O2-HRP, Acta Chimica Sinica (in Chinese), 1997, 55: 1121–1129.
Wang Huawei, Shen Baoen, Peng Tuzhi et al., The mechanism of electrooxidation of o-tolidine, J. of Hangzhou Universities (in Chinese), 1994, 21(2): 198–203.
Cheng, G, Yang, Y, Dong, S., Spectroelectrochemical study of biliverdin produced by the electrooxidation of bilirubin. Bioelectrochem. Bioenerg., 1991, 26: 35–39.
Dong Shaojun, Song Shihua, Cheng Guangjin, Optically thin-layer spectroelectrochemical investigation on murexide electroreduction progress, Acta Physico-Chimica Sinica (in Chinese), 1987, 3(4): 368–373.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Jiao, K., Yang, T. & Niu, S. A thin-layer spectroelectrochemical study of 3,3′,5,5′-tetramethylbenzidine at SnO2:F film optically transparent electrode. Sc. China Ser. B-Chem. 47, 267–275 (2004). https://doi.org/10.1360/03yb0174
Received:
Issue Date:
DOI: https://doi.org/10.1360/03yb0174