The system VO2+ +oxidized glutathione: a potentiometric and spectroscopic study |
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Authors: | Pessoa J C Tomaz I Kiss T Buglyó P |
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Affiliation: | Centro Química Estrutural, Instituto Superior Técnico, Lisboa, Portugal. pcjpessoa@popsrv.ist.utl.pt |
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Abstract: | The equilibria in the system VO2+ +oxidized glutathione in aqueous solution have been studied in the pH range 2-11 by a combination of pH potentiometry and spectroscopy (EPR, visible absorption and circular dichroism). The results of the various methods are self-consistent and the equilibrium model includes the species MLH4, MLH3, MLH2, MLH, ML, MLH(-1), MLH(-2) and several hydrolysis products (where H4L denotes oxidized glutathione); individual formation constants and spectra are given. Plausible structures for each stoichiometry are discussed. |
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