- Title
- Electrocatalytic behavior of substituted cobalt phthalocyanines towards the oxidation of cysteine
- Creator
- Maree, Suzanne, Nyokong, Tebello
- Subject
- To be catalogued
- Date
- 2000
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/293268
- Identifier
- vital:57070
- Identifier
- xlink:href="https://doi.org/10.1016/S0022-0728(00)00281-3"
- Description
- Ring substituted cobalt phthalocyanine complexes of the form CoPc(X)4, (where X=NH2, NO2, C(CH3)3, SO3H and COOH) are compared for their catalytic activities towards the oxidation of cysteine. The potential for the electrocatalytic oxidation of cysteine is closely related to the CoIII/CoII couple of the CoPc(X)4 complexes in acidic media and to the CoII/CoI couple in basic media. The catalytic currents and the oxidation potential for cysteine are dependent on the pH of the solution, the potential becoming less positive as the pH increases and the catalytic currents decreasing with increase in pH, for the same concentration of cysteine. The magnitudes of the catalytic currents (after ten scans) for cysteine oxidation at pH 8.3 and on electrodes modified with the CoPc(X)4 complexes increased with the nature of the ring substituent as follows: NO2 less than NH2 less than SO3H less than C(CH3)3 less than COOH.
- Format
- computer, online resource, application/pdf, 1 online resource (8 pages), pdf
- Publisher
- Elsevier
- Language
- English
- Relation
- Journal of Electroanalytical Chemistry, Maree, S. and Nyokong, T., 2000. Electrocatalytic behavior of substituted cobalt phthalocyanines towards the oxidation of cysteine. Journal of Electroanalytical Chemistry, 492(2), pp.120-127, Journal of Electroanalytical Chemistry volume 492 number 2 p. 120 2000 1572-6657
- Rights
- Publisher
- Rights
- Use of this resource is governed by the terms and conditions of the Elsevier Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)
- Rights
- Closed Access
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Collections
Nyokong, Tebello (Distinguished Professor)
RU Department of Chemistry
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