Kinetic features of the methylinoleate oxidation in micelles of sodium dodecyl sulfate

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By combining kinetic and physicochemical methods with computer simulation, new information was obtained on the oxidation of methyllinoleate (LH) in micelles of sodium dodecyl sulfate (SDS) at 323 K. The dynamics of the process is related to the nature of the change in the volume of the micellar phase (Vmic). A gradual increase in Vmic leads to a decrease in the concentration of the oxidation substrate. This change occurs not only due to chemical reactions, but also due to a change in the volume of the microreactor in which the chemical transformation takes place. The accumulation of hydroperoxides inside those micelles in which LH is oxidized leads to the transformation of their structure and the formation of mixed micelles. Kinetic analysis shows that chain termination can occur by a mixed mechanism. The reaction order according to the initiator varies from 0.61 to 0.71. Leading oxidation chains, peroxy radicals (LO2•), are involved in both quadratic and linear termination. Linear termination occurs with the participation of hydroperoxyl radicals (HO2•). The formation of HO2• is due to the reaction LO2• → → product + HO2• occurring in the organic phase. The resulting HO2• goes into the aqueous phase, where the rate of their disproportionation is very low. Formally, this is fixed as a linear open circuit.

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作者简介

S. Molodochkina

P.G. Demidov Yaroslavl State University

Email: pliss@uniyar.ac.ru
俄罗斯联邦, Yaroslavl

D. Loshadkin

Yaroslavl State Technical University

Email: pliss@uniyar.ac.ru
俄罗斯联邦, Yaroslavl

E. Pliss

P.G. Demidov Yaroslavl State University

编辑信件的主要联系方式.
Email: pliss@uniyar.ac.ru
俄罗斯联邦, Yaroslavl

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2. Fig. 1. Dependence of the rate of oxidation of methyl linoleate in SDS micelles on time in a phosphate buffer solution at pH 7.4. [AARN] = 8 mM, [LH] = 3 mM,  - [SDS] = 100 mM,  - [SDS] = 150 mM.

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3. Fig. 2. Dependence of the rate of oxidation of methyl linoleate in SDS micelles on time in a phosphate buffer solution at pH 7.4. [AARN] = 8 mM, [LH] = 6 mM,  - [SDS] = 100 mM,  - [SDS] = 150 mM.

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4. Fig. 3. Kinetic curves of oxygen absorption during the oxidation of methyl linoleate in SDS micelles in a phosphate buffer solution at pH 7.4. [SDS] = 100 mM, [LH] = 5 mM, 1 - [AAPH] = 12 mM, 2 - [AAPH] = 8 mM, 3 - [AAPH] = 4 mM.

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5. Fig. 4. Dependence of the kinetics of oxygen absorption during the oxidation of methyl linoleate in SDS micelles in a phosphate buffer solution on its concentration at pH = 7.4, [AAPH] = 8 mM, [SDS] = 100 mM:  — [LH] = = 7.5 mM,  — [LH] = 5.0 mM,  — [LH] = 2.5 mM.

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6. Fig. 5. Kinetic curves of oxygen absorption during the oxidation of methyl linoleate in SDS micelles in a phosphate buffer solution at pH 7.4, [AAPH] = 8 mM, [SDS] = 150 mM:  — [LH] = 9.0 mM,  — [LH] = 6.0 mM,  — [LH] = 3.0 mM.

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