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Herszage, J.; Dos Santos Afonso, M.; Luther III, G.W. "Oxidation of cysteine and glutathione by soluble polymeric MnO2" (2003) Environmental Science and Technology. 37(15):3332-3338
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Abstract:

The kinetics of reduction of soluble polymeric Mn02 by cysteine and glutathione has been studied in the pH range of 4.0-9.0. The concentration of thiols was varied between 1 and 2 mM, while the Mn02 concentration was varied between 2 and 12 μM. In this pH range, the reaction products were identified as MN(II) and the corresponding disulfides (cystine and glutathione disulfide). Cysteic or cysteinesulfonic acid was formed only when pH < 2. Experimental data indicate that the rate law over the pH range of 4-9 is first-order in both Mn02 and thiol concentration. Eyring plots for both thiols reacting with Mn02 indicate that the reaction is associative (ΔS‡∼ -160 J mol-1 K-1) and proceeds via an inner-sphere redox process. The reaction proceeds via the formation of two different inner-sphere complexes ≡MnIVSR- and ≡MnIVSR and their further reaction to products. Both surface species are linked to each other via acid-base equilibria, and the rate constant decreases as pH increases, The presence of two ligand surface species is determined using surface complexation modeling, A reaction mechanism in agreement with the experimental results is proposed.

Registro:

Documento: Artículo
Título:Oxidation of cysteine and glutathione by soluble polymeric MnO2
Autor:Herszage, J.; Dos Santos Afonso, M.; Luther III, G.W.
Filiación:Depto. Quim. Inorg., Analit./Q. F., Universidad de Buenos Aires, Ciudad Universitaria Pabellon II, (C1428EHA) Buenos Aires, Argentina
College of Marine Studies, University of Delaware, Lewes, DE 19956, United States
Palabras clave:Concentration (process); Manganese compounds; Oxidation; pH; Reaction kinetics; Redox reactions; Reaction products; Environmental engineering; cysteic acid; cysteine; cystine; glutathione; manganese dioxide; manganese oxide; protein; reaction kinetics; aquatic environment; article; bioavailability; chemical reaction kinetics; complex formation; disulfide bond; electrochemistry; oxidation; polymerization; protein degradation; reaction analysis; water sampling; Cysteine; Glutathione; Hydrogen-Ion Concentration; Manganese Compounds; Oxidation-Reduction; Oxides; Solubility; Water Pollutants
Año:2003
Volumen:37
Número:15
Página de inicio:3332
Página de fin:3338
DOI: http://dx.doi.org/10.1021/es0340634
Título revista:Environmental Science and Technology
Título revista abreviado:Environ. Sci. Technol.
ISSN:0013936X
CODEN:ESTHA
CAS:cysteic acid, 13100-82-8, 498-40-8; cysteine, 4371-52-2, 52-89-1, 52-90-4; cystine, 24645-67-8, 56-89-3, 6020-39-9; glutathione, 70-18-8; manganese dioxide, 1313-13-9; Cysteine, 52-90-4; Glutathione, 70-18-8; Manganese Compounds; manganese dioxide, 1313-13-9; Oxides; Water Pollutants
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0013936X_v37_n15_p3332_Herszage

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Citas:

---------- APA ----------
Herszage, J., Dos Santos Afonso, M. & Luther III, G.W. (2003) . Oxidation of cysteine and glutathione by soluble polymeric MnO2. Environmental Science and Technology, 37(15), 3332-3338.
http://dx.doi.org/10.1021/es0340634
---------- CHICAGO ----------
Herszage, J., Dos Santos Afonso, M., Luther III, G.W. "Oxidation of cysteine and glutathione by soluble polymeric MnO2" . Environmental Science and Technology 37, no. 15 (2003) : 3332-3338.
http://dx.doi.org/10.1021/es0340634
---------- MLA ----------
Herszage, J., Dos Santos Afonso, M., Luther III, G.W. "Oxidation of cysteine and glutathione by soluble polymeric MnO2" . Environmental Science and Technology, vol. 37, no. 15, 2003, pp. 3332-3338.
http://dx.doi.org/10.1021/es0340634
---------- VANCOUVER ----------
Herszage, J., Dos Santos Afonso, M., Luther III, G.W. Oxidation of cysteine and glutathione by soluble polymeric MnO2. Environ. Sci. Technol. 2003;37(15):3332-3338.
http://dx.doi.org/10.1021/es0340634