2020
DOI: 10.3390/biomimetics5040048
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Oxidation of L-Ascorbic Acid in the Presence of the Copper-Binding Compound from Methanotrophic Bacteria Methylococcus capsulatus (M)

Abstract: The oxidation of ascorbic acid by air oxygen and hydrogen peroxide in the presence of the copper-binding compound (cbc) from bacteria Methylococcus capsulatus (M) was studied. The rate constant of ascorbic acid oxidation by air oxygen in the presence of the copper complex with cbc from M. capsulatus (M) was shown to be 1.5 times higher than that of the noncatalytic reaction. The rate constant of ascorbic acid oxidation by hydrogen peroxide in the presence of the copper complex with cbc from M. capsulatus (M) d… Show more

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Cited by 7 publications
(8 citation statements)
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“…On the other hand, other studies have chosen to adopt a mechanism where the reaction between copper and ascorbic acid corresponds to a redox-type reaction, with charge transfer between the two species to form Cu­(I) and ascorbate radical (eq ). ,,,,, …”
Section: Resultsmentioning
confidence: 99%
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“…On the other hand, other studies have chosen to adopt a mechanism where the reaction between copper and ascorbic acid corresponds to a redox-type reaction, with charge transfer between the two species to form Cu­(I) and ascorbate radical (eq ). ,,,,, …”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, other studies have chosen to adopt a mechanism where the reaction between copper and ascorbic acid corresponds to a redox-type reaction, with charge transfer between the two species to form Cu(I) and ascorbate radical (eq 5). 17,23,26,28,38,39 For instance, Khan and Martell 43 proposed a catalytic reaction where the charge transfer occurs within an AA-O 2 -Cu(II) complex with oxygen acting as a bridge for this electron transfer between ascorbic acid and copper, leading to the formation of ascorbate radical and superoxide. Jameson and Blackburn 35 also proposed a mechanism in which the formation of the AA-O 2 -Cu(II) complex was hypothesized followed by the formation of the ascorbate radical that also reacts with the AA-O 2 -Cu(II) complex and is oxidized to form DHA.…”
Section: Identification Of the Oxidizing Agent According To The Mecha...mentioning
confidence: 99%
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“… Reaction mechanisms of secondary antioxidants: ( X ) Metal ion (Cu 2+ ) chelating activity of anthocyanidine (cyanidin), from [ 30 ] published by The Royal Society of Chemistry; ( XI ) oxygen scavenging activity of ascorbic acid, reproduced from [ 31 ] under Creative Common license; ( XII ) chemical reaction of quercetin with singlet oxygen, reproduced from [ 32 ] with the permission of Elsevier. …”
Section: Figurementioning
confidence: 99%
“…17,26 In fact, we demonstrated how Na 2 CO 3 plays a double role in the process economy: it quenches the hydrochloric acid released during the regeneration step (thus preventing the protonation of the ligand and subsequent decomplexation of copper) 27 and deprotonates H 2 AA to sodium ascorbate, a more active reductant. [28][29][30] This latter role is extremely important since the Cu(I)/Cu(II) ratio dictates the concentration of radicals (thus, both the polymerization rate and the control over the process)i.e., if the concentration of Cl-Cu(II) L becomes too low control vanishes over chain-end fidelity (CEF % ), dispersity (Đ), and molecular weight (M n ). 18,31 Notwithstanding the satisfactory results obtained in ethyl acetate/ethanol (EtOAc/EtOH) mixtures, ARGET ATRP with the hydrophilic couple H 2 AA/Na 2 CO 3 leads to the formation of heterogeneous mixtures, given their insolubility in nonaqueous solvents.…”
Section: Introductionmentioning
confidence: 99%