Antioxidant activity of catecholamines during the oxidation of methyl linoleoate in Triton X-100 micelles

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The effect of catecholamines on the oxidation of methyl linoleate in Triton X-100 micelles was studied. It has been established that catecholamines do not inhibit oxidation at a pH 7.4. Inhibition is only possible in the presence of the superoxide dismutase enzyme or at lower pH levels. The reason for this effect is the interaction of anionic forms of phenols and phenoxyl radicals with oxygen with the formation of superoxide anions. High values of inhibition coefficients for catecholamines in the presence of superoxide dismutase are due to the reactions of the resulting ortho-quinones, leading to the regeneration of OH groups.

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Sobre autores

V. Ryabkova

Demidov Yaroslavl State University

Email: tikhonoviv.ysu@gmail.com
Rússia, Yaroslavl

I. Tikhonov

Demidov Yaroslavl State University

Autor responsável pela correspondência
Email: tikhonoviv.ysu@gmail.com
Rússia, Yaroslavl

E. Pliss

Demidov Yaroslavl State University

Email: tikhonoviv.ysu@gmail.com
Rússia, Yaroslavl

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2. Fig. 1. Dependence of the rate of LH oxidation in W micelles on the concentration of epinephrine, norepinephrine, DOPA, and dopamine in the absence (dark dots) and in the presence of 100 units/ml of SOD (light dots) at pH = 7.4.

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3. 2. Kinetic curves of oxygen absorption during LH oxidation in micelles without an inhibitor (1) and in the presence of 4 · 10-6 mol·l–1 DOPA (2), dopamine (3) and norepinephrine (4); [SOD] = 100 units/ml, pH = 7.4.

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4. Scheme

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5. 3. Dependence of the rate of LH oxidation in micelles on the concentration of dopamine at pH = 4.0 (1), 5.0 (2), 6.0 (3), 7.4 (4).

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