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

• Autorzy: Szymula M. , Narkiewicz-Michałek N.
• Konferencja: 10th Ukrainian-Polish Symposium "Theoretical and Experimental Studies of Interfacial Phenomena and Their Technological Applications", Lviv-Uzlissja, Ukraine
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

antioxidants; microemulsion; electrochemical oxidation; cyclic voltammetry

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2008
• Tom: Vol. 82, nr 1-2
• Strony: 121--129
• Opis fizyczny: Bibliogr. 37 poz., rys.

Twórcy

autor

Szymula M.

autor

Narkiewicz-Michałek N.

• Department of Radiochemistry & Colloid Chemistry,

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