Oxidation of L-glutamine by manganese(iii) in aqueous sulfuric acid, acetic acid, and pyrophosphate media: A kinetic and mechanistic study

Rangappa, Kanchugarakoppal S.; Chandraju, S.; Gowda, N. M. Made

doi:10.1002/(sici)1097-4601(1998)30:1<7::aid-kin2>3.0.co;2-w

Cited by 21 publications

(8 citation statements)

References 11 publications

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“…Thus, we conclude that the new spectra (Figures 4 and 5) are that of the manganese(III)-EDTA complex with l max ¼ 500 nm. Our l max values are in good agreement with the literature values [22]. On the other hand, stable Mn(III)-EDTA complex is not formed in the absence of externally added Mn(II) (vide supra, Table 2).…”

Section: Preparation and Characterisation Of Colloidal Mno 2 By The Osupporting

confidence: 91%

Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Zaheer

Rafi-Ud-Din

2012

Journal of Experimental Nanoscience

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Section: Preparation and Characterisation Of Colloidal Mno 2 By The Osupporting

confidence: 91%

Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Zaheer

Rafi-Ud-Din

2012

Journal of Experimental Nanoscience

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“…Some studies have been reported on the kinetics of Mn III oxidations of various substrates like formaldehyde [7], dipeptides [8] and amino acids [9] in perchloric, sulfuric, acetic, and pyrophosphate medium [10,11]. Extensive work has been reported on the kinetics of oxidation of amino acids like glycine [12], methionine [13], threonine [14], and other amino acids [15] by Mn III as oxidant.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and mechanism of oxidation of l-cystine by manganese(III) in sulfuric acid medium

Nowduri

Kumar

Vani

et al. 2008

Transition Met Chem

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The kinetics of oxidation of L-cystine by Mn III have been studied in sulfuric acid medium at 30°C. The reaction was followed spectrophotometrically at kmax = 500 nm. The reaction shows first order dependence on both [Mn III ] and [cystine]. It was found that the rate of the reaction decreases with increase of [H + ] up to a certain point and then remains unchanged. The oxidation product of the reaction was found to be cysteic acid. A plausible mechanism has been proposed to account for the experimental results.

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“…Sulfuric acid applied in these experiments is expected to affect the oxidation kinetics via complexation of the oxidant and protonation of the reductant. To the best of our knowledge, data on oxidation processes by manganese(III) in sulfuric acid media are so far limited to a study of the kinetics of L-glutamine oxidation by Made Gowda et al [19].…”

Section: Introductionmentioning

confidence: 99%

Oxidation of phenothiazine dyes by manganese(III) in sulfuric acid solution

Katafias

Fenska

2011

Transition Met Chem

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Manganese(III) sulfato complexes cause the oxidative degradation of methylene blue and its partially and fully N-demethylated derivatives, azure B and thionine dyes, respectively, in sulfuric acid media. The reaction proceeds through a colored reactive organic radical generated in the first stage via one-electron oxidation of the starting material, leading to a mixture of N-demethylated and/or deaminated species. The rates of formation of the methylene blue and azure B radicals are much higher than those of their further decomposition, whereas the generation of the thionine radical is much slower than its immeasurably fast decay. The kinetics of decomposition of all three dyes and the methylene blue and azure B radicals were studied spectrophotometrically under isolation conditions at 298 K. The first stage of each reaction proceeds according to a second-order rate expression, being first order in the dyes and in the manganese(III) concentrations. Dependence of the pseudo-firstorder rate constants on the oxidant concentration for the second stage exhibits a saturation effect under the applied conditions. It is postulated that electron transfer takes place between the [Mn(SO 4 ) 3 ] 3-complex and the protonated form of the dye. The reactivity order of the dyes as determined from the second-order rate constants for the first reaction stage corresponds to the order of their HOMO energies.

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Oxidation of L-glutamine by manganese(iii) in aqueous sulfuric acid, acetic acid, and pyrophosphate media: A kinetic and mechanistic study

Cited by 21 publications

References 11 publications

Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Kinetics and mechanism of oxidation of l-cystine by manganese(III) in sulfuric acid medium

Oxidation of phenothiazine dyes by manganese(III) in sulfuric acid solution

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