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The Electrochemical Oxidation of Selected Antioxidants at a Glassy Carbon Electrode in Microemulsions

Szymula M., Narkiewicz-Michałek N.

Polish Journal of Chemistry

2008

Vol. 82, nr 1-2

121-129

The electrochemical oxidation of three antioxidants of various hydrophilic/hydrophobic characters in microemulsions stabilized by the anionic surfactant SDS was investigated using the cyclic voltammetry method. It was found that in microemulsions the oxidation process ismore difficult than in electrolyte solutions. The oxidation potential (Epa) of hydrophobic antioxidants propyl gallate (PG) and alfa-tocopherol (alfa-T) at a glassy carbon electrode increases monotonically with the decrease of water content, whereas for the ascorbic acid (AA) the peak potential behaviour is more complicated. At first, Epa increases with the decreasing oil content up to the bicontinuous phase composition and then decreases rapidly. The currents (Ipa) for hydrophobic antioxidants are low in the whole composition range of microemulsion. For hydrophilic AA, Ipa is much higher, especially in the oil-in-water system. In the paper the changes of redox parameters of selected antioxidants are related to the micro-heterogeneity of the colloidal system and the structure of the adsorption layer formed on the electrode surface.

Standardy jakości o szczególnym znaczeniu dla przemysłu motoryzacyjnego

Szymula M.

Problemy Jakości

2005

R. 37, nr 8

23--26

Przegląd i przypomnienie najważniejszych norm.

Rola kosztów w zarządzaniu przedsiębiorstwem

Szymula M.

Problemy Jakości

2005

R. 37, nr 10

40--41

Rachunek kosztów jakości jako miernik skuteczności systemu.

The author tries to sum up the achievements of quality-related research in the field of quality-related costs. She describes the evolution in analysing and monitoring of quality-related costs and goes on to emphasise their significance in any business operations.