Oxidation of cysteine and glutathione by soluble polymeric MnO2

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...

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Autor principal: Herszage, J.
Otros Autores: Dos Santos Afonso, M., Luther III, G.W
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2003
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024 7 |2 scopus  |a 2-s2.0-0043212021 
024 7 |2 cas  |a 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 
040 |a Scopus  |b spa  |c AR-BaUEN  |d AR-BaUEN 
030 |a ESTHA 
100 1 |a Herszage, J. 
245 1 0 |a Oxidation of cysteine and glutathione by soluble polymeric MnO2 
260 |c 2003 
270 1 0 |m Dos Santos Afonso, M.; Depto. Quim. Inorg., Analit./Q. F., Universidad de Buenos Aires, Ciudad Universitaria Pabellon II, (C1428EHA) Buenos Aires, Argentina; email: dosantos@qi.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
593 |a Depto. Quim. Inorg., Analit./Q. F., Universidad de Buenos Aires, Ciudad Universitaria Pabellon II, (C1428EHA) Buenos Aires, Argentina 
593 |a College of Marine Studies, University of Delaware, Lewes, DE 19956, United States 
690 1 0 |a CONCENTRATION (PROCESS) 
690 1 0 |a MANGANESE COMPOUNDS 
690 1 0 |a OXIDATION 
690 1 0 |a REACTION KINETICS 
690 1 0 |a REDOX REACTIONS 
690 1 0 |a REACTION PRODUCTS 
690 1 0 |a ENVIRONMENTAL ENGINEERING 
690 1 0 |a CYSTEIC ACID 
690 1 0 |a CYSTEINE 
690 1 0 |a CYSTINE 
690 1 0 |a GLUTATHIONE 
690 1 0 |a MANGANESE DIOXIDE 
690 1 0 |a MANGANESE OXIDE 
690 1 0 |a PROTEIN 
690 1 0 |a REACTION KINETICS 
690 1 0 |a AQUATIC ENVIRONMENT 
690 1 0 |a ARTICLE 
690 1 0 |a BIOAVAILABILITY 
690 1 0 |a CHEMICAL REACTION KINETICS 
690 1 0 |a COMPLEX FORMATION 
690 1 0 |a DISULFIDE BOND 
690 1 0 |a ELECTROCHEMISTRY 
690 1 0 |a OXIDATION 
690 1 0 |a POLYMERIZATION 
690 1 0 |a PROTEIN DEGRADATION 
690 1 0 |a REACTION ANALYSIS 
690 1 0 |a WATER SAMPLING 
690 1 0 |a CYSTEINE 
690 1 0 |a GLUTATHIONE 
690 1 0 |a HYDROGEN-ION CONCENTRATION 
690 1 0 |a MANGANESE COMPOUNDS 
690 1 0 |a OXIDATION-REDUCTION 
690 1 0 |a OXIDES 
690 1 0 |a SOLUBILITY 
690 1 0 |a WATER POLLUTANTS 
650 1 7 |2 spines  |a PH 
700 1 |a Dos Santos Afonso, M. 
700 1 |a Luther III, G.W. 
773 0 |d 2003  |g v. 37  |h pp. 3332-3338  |k n. 15  |p Environ. Sci. Technol.  |x 0013936X  |w (AR-BaUEN)CENRE-14  |t Environmental Science and Technology 
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856 4 0 |u https://hdl.handle.net/20.500.12110/paper_0013936X_v37_n15_p3332_Herszage  |y Handle 
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