Studies of vitamin C antioxidative activity in the N-oxide surfactant solutions

[Display omitted] ► In the solutions containing N-oxides vitamin C undergoes atmospheric oxidation more readily than in pure water. ► Up to the very low AA concentration zero order kinetics is observed suggesting heterogeneous catalytic reaction. ► At higher pH more AA molecules are present in the f...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2012-11, Vol.413, p.33-37
Main Authors: Niedziółka, K., Szymula, M., Lewińska, A., Wilk, K.A., Narkiewicz-Michałek, J.
Format: Article
Language:English
Subjects:
Aliphatic mono- and di-N-oxides
Antioxidant activity
ascorbic acid
Atmospheric oxidation
Atmospherics
Colloids
Oxidation
Spectroscopy
Surface chemistry
Surfactants
Surfactants system
Vitamin C
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Summary:[Display omitted] ► In the solutions containing N-oxides vitamin C undergoes atmospheric oxidation more readily than in pure water. ► Up to the very low AA concentration zero order kinetics is observed suggesting heterogeneous catalytic reaction. ► At higher pH more AA molecules are present in the form of ascorbate monoanion which undergoes oxidation much more readily. ► MEDA is the most effective promoter of AA oxidation. The results of vitamin C atmospheric oxidation in the N-oxide surfactant solutions obtained by UV-Vis spectroscopy are presented. As follows from our studies, in the solutions containing N-oxides vitamin C undergoes atmospheric oxidation more readily than in pure water and the rate of oxidation increases with the increasing surfactant concentration. The stabilizing effect of high surfactant concentration on vitamin C was not observed as it was the case of ionic surfactants: SDS and CTAB.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2012.02.047