Czech J. Food Sci., 2005, 23(6):230-239 | DOI: 10.17221/3396-CJFS

Oxidative changes of vegetable oils during microwave heating

Jana Dostálová, Pavel Hanzlík, Zuzana Réblová, Jan Pokorný
Department of Food Chemistry and Analysis, Faculty of Food and Biochemical Technology, Institute of Chemical Technology in Prague, Prague, Czech Republic

The oxidative stabilities of pork lard, sunflower, zero-erucic rapeseed, peanut and high-oleic peanut oils were tested under microwave heating conditions. Vegetable oils and lard were heated in a microwave oven for up to 40 min between 25°C and 200°C. The peroxide value, the contents of conjugated dienoic and trienoic acids, and polymers were used as markers of lipid degradation. Sunflower oil was found the least stable oil because of a high polyenoic acid content and a low content of γ-tocopherol. Rapeseed oil was more stable because of a lower polyenoic acid content and a high γ-tocopherol level. Conventional peanut oil was relatively stable, but substantially less stable than high-oleic peanut oil. Pork lard and high-oleic peanut oil formed only low levels of polymers due to a low polyenoic acid content.

Keywords: microwave heating; oxidation; polymerisation; pork lard; vegetable oils

Published: December 31, 2005  Show citation

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Dostálová J, Hanzlík P, Réblová Z, Pokorný J. Oxidative changes of vegetable oils during microwave heating. Czech J. Food Sci. 2005;23(6):230-239. doi: 10.17221/3396-CJFS.
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