Oxidation of L‐aspartic acid and L‐glutamic acid by manganese(III) ions in aqueous sulphuric acid, acetic acid, and pyrophosphate media: A kinetic study

Sherigara, B. S.; Bhat, K. Ishwar; Pinto, Ivan; Gowda, N. M. Made

doi:10.1002/kin.550270707

Cited by 38 publications

(21 citation statements)

References 8 publications

(2 reference statements)

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“…This unstable intermediate immediately decomposes to give iminic cation and CO 2 as observed earlier in the oxidation of amino acids [30][31][32] Several authors have also reported [11,27] the formation of an unstable cyclic gold(III) intermediate complex in the oxidation of organic substrates by gold(III). Finally, the iminic cation undergoes fast hydrolysis to produce formaldehyde and ammonium ion [33].…”

Section: Resultsmentioning

confidence: 89%

Kinetics and mechanism of the reduction of gold(III) by glycine in acetate buffer

Sen

Gani

Midya

et al. 2007

Transition Met Chem

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The kinetics of reduction of tetrachloroaurate(III) by glycine has been spectrophotometrically studied in NaOAc-AcOH buffer in the pH range 3.73-4.77. The reaction is first order with respect to both Au(III) and glycine. Both H + and Cl -ions have inhibiting effects on the reaction rate. The rate decreases with a decrease in the dielectric constant of the medium. AuCl 4 -and AuCl 3 (OH) -are presumed to be the predominant oxidizing species under the conditions of the experiment. The reaction of gold(III) and zwitterionic species of glycine proceeds with the intermediate formation of gold(I) and iminic cation and the latter subsequently hydrolyses in a fast step to produce formaldehyde and ammonium ion. Formaldehyde was identified as the only organic product by 1 H NMR spectroscopy.

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Section: Resultsmentioning

confidence: 89%

Kinetics and mechanism of the reduction of gold(III) by glycine in acetate buffer

Sen

Gani

Midya

et al. 2007

Transition Met Chem

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“…Gly-Ala-Pro, Gly-Val-Pro, Gly-Ile-Pro and Gly-PhePro, dipeptides, Ala-Pro, Val-Pro, Ile-Pro and Phe-Pro and free amino acid in the presence of different aqueous acid mediums [8][9][10][11]. The change in each case is due to the increased distance between the functional groups and consequently weaker electrostatic effects.…”

Section: Methodsmentioning

confidence: 99%

“…Mn(III) porphyrins have been studied as possible models for closely related biologically significant systems [7]. In recent years, kinetics of oxidation of amino acids, its derivatives, peptides, and proteins have been studied using Mn(III) in different mediums [8][9][10][11][12].…”

Section: Introductonmentioning

confidence: 99%

Mn(III) oxidation of peptides: A mechanistic investigation of kinetic variations in hydrophobic‐induced oxidation of tetrapeptides of elastin sequences

Srinivasa

Abiraj

Baba

et al. 2005

Int J of Chemical Kinetics

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Four tetrapeptide analogues of elastin sequences, glycyl-glycyl-alanyl-proline (GGAP), glycyl-glycyl-valyl-proline (GGVP), glycyl-glycyl-isoleucyl-proline (GGIP), and glycylglycyl-phenylalanyl-proline (GGFP) were synthesized, based on their increasing order of hydrophobicity, by a classical solution phase method and were characterized. These tetrapeptides (TETPs) were oxidized using Mn(OAc) 3 in 25% acetic acid at 298 K, and the kinetics of the reaction was monitored spectrophotometrically at λ max = 400 nm. A first-order dependence of rate on each of [Mn(OAc)

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“…[1,2] There are several reports of oxidation of various substrates by Mn(III) in acid solutions containing such salts as perchlorate, sulfate, acetate, and pyrophosphate. [7][8][9][10][11][12][13] A study of the kinetics and mechanism of oxidation of DL-Ala by Mn(III) in aqueous acetic acid solutions is reported here.…”

Section: Introductionmentioning

confidence: 99%

Manganese(III) Oxidation of Alanine in Aqueous Ethanoic Acid Medium: A Kinetic and Mechanistic Study

Kumar¹,

Chandraju

Gowda

2011

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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A stock solution of manganese(III) acetate in aqueous acetic acid has been prepared using a standard electrochemical method. The nature of the oxidizing species present in manganese(III) solutions has been characterized by spectrophotometric and redox potential measurements. Kinetics of oxidation of DL-alanine (Ala) by manganese(III) in aqueous acetic acid solution at 313 K have been investigated. The experimental rate law is: rate = k [Mn(III)] 0.5 [Ala] 0.9 [OAc − ] y0.5 /[H + ] 0.5 , where each species shows a fractional order. Effects of varying ionic strength, solvent composition, and the added ions such as fluoride, chloride, and perchlorate have been investigated. Activation parameters have been evaluated using Arrhenius and Eyring plots. A mechanism consistent with the observed kinetic data has been proposed and discussed. A suitable rate law has been derived based on the mechanism.

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Oxidation of L‐aspartic acid and L‐glutamic acid by manganese(III) ions in aqueous sulphuric acid, acetic acid, and pyrophosphate media: A kinetic study

Cited by 38 publications

References 8 publications

Kinetics and mechanism of the reduction of gold(III) by glycine in acetate buffer

Kinetics and mechanism of the reduction of gold(III) by glycine in acetate buffer

Mn(III) oxidation of peptides: A mechanistic investigation of kinetic variations in hydrophobic‐induced oxidation of tetrapeptides of elastin sequences

Manganese(III) Oxidation of Alanine in Aqueous Ethanoic Acid Medium: A Kinetic and Mechanistic Study

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