On the Polarographic Reduction Wave of Dehydroascorbic Acid

Ono, Shimpei; Takagi, Masanosuke; Wasa, Tamotu

doi:10.1021/ja01113a536

Cited by 27 publications

(10 citation statements)

References 3 publications

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“…chemically inactive substance. This substance could be the compound produced during the Dehydro-L-ascorbic Acid hydration of one of the two carbonyl groups of The polarographic study shows that the re-the dehydroascorbic acid (1,2 two electron transfer to take place by the tunnel effect (the probabilities being extremely low), reduction mechanism is proposed as shown in Fig. 8, where reactions 1 and 2 represent the dehydration of the carbonyl group, 3 and 4 the one electron transfers, and 5 the recon~bination with the H + ion to form L-ascorbic acid.…”

Section: Resultsmentioning

confidence: 99%

Mechanism of L-ascorbic acid oxidation and dehydro-L-ascorbic acid reduction on a mercury electrode. I. Acid medium

Ruiz¹,

Aldaz²,

Domínguez³

1977

Can. J. Chem.

124

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JUAN Josh RUIZ, ANTONIO ALDAZ, and MANUEL DOM~NGUEZ. Can. J. Chem. 55,2799Chem. 55, (1977. A polarographic study of the oxidation mechanism of L-ascorbic acid and of the reduction mechanism of dehydro-L-ascorbic acid was carried out in an acid medium.For L-ascorbic acid, the oxidation process involves a two electron transfer and obeys the overall reactionThe polarographic curve shows that the limiting current is governed by diffusion. On the rising portion of the wave, the two electron oxidation process consists of two consecutive one electron transfers, the second being the rate determining step (rds). The reaction orders, together with the Tafel slopes, were calculated.The reduction of dehydro-L-ascorbic acid at the limiting current is kinetically controlled and involves a two electron transfer. The reaction kinetic pathways were studied and the reaction orders and Tafel slope were calculated. It is deduced that, for low overvoltages, the second one electron transfer is the rate determining step. Pour I'acide L-ascorbique, le processus d'oxydation implique un transfert de deux tlectrons et est soumis a la reaction gtnerale La courbe polarographique montre que le courant limitant est gouvernt par la diffusion. Sur la portion montante de la vague, le processus d'oxydation a deux tlectrons implique deux transferts successifs d'un tlectron, le deuxieme ttant l'ttape detern~inante de la vitesse de la rtaction. Les ordres de la rtaction ainsi que les pentes de Tafel ont t t t calcults.La rtduction de I'acide dthydro-L-ascorbique, a courant limitant, est contrBlke cinktiquement et implique un transfert de deux tlectrons. On a ttudie les chemins reactionnels cinttiques et on a calcult les ordres de la reaction et la pente de Tafel. On en dtduit qu'a de bas survoltages, le deuxieme transfert d'un Clectron est l'ttape dtterminante de la vitesse de la rtaction.[Traduit par le journal]

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Section: Resultsmentioning

confidence: 99%

Mechanism of L-ascorbic acid oxidation and dehydro-L-ascorbic acid reduction on a mercury electrode. I. Acid medium

Ruiz¹,

Aldaz²,

Domínguez³

1977

Can. J. Chem.

124

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“…Kinetic currents limited by the rate of dehydration of the keto group were observed in the reduction of dehydroascorbic acid (A) [194,195]. The ilim value of the polarographic wave of reduction of this acid is smaller by about three orders of magnitude, as can be predicted by the Ilkovic equation, and shows a very high temperature coefficient.…”

Section: Rate Of Dehydration Of Carbonyl Groupsmentioning

confidence: 93%

Catalytic and Kinetic Waves in Polarography

Mairanovskii¹

1968

129

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“…2) must be very rapid. Ono et al [23] also found that dehydro-L-ascorbic acid gave a polarographic reduction wave between about pH 2 and 5; at higher pH the compound is very unstable. However, the exact identity of this species was not specified.…”

Section: Electrochemistry Of Ascorbic Acidmentioning

confidence: 94%

“…Ono and co-workers [23] subsequently showed that L-ascorbic acid exhibits a single polarographic oxidation wave below pH 8 but two waves at pH greater than 8. Ascorbic acid is not very stable in alkaline solution, and On o et a/.…”

Section: Electrochemistry Of Ascorbic Acidmentioning

confidence: 99%

“…Ascorbic acid is not very stable in alkaline solution, and On o et a/. Based on their results, Ono and co-workers [23] concluded that the first polarographic oxidation wave of L-ascorbic acid (I, Fig. Based on their results, Ono and co-workers [23] concluded that the first polarographic oxidation wave of L-ascorbic acid (I, Fig.…”

Section: Electrochemistry Of Ascorbic Acidmentioning

confidence: 99%

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