Articles

EFFECT OF MICROWAVE HEATING ON FATTY ACID COMPOSITION AND QUALITY CHARACTERISTICS OF VIRGIN OLIVE OIL, CORN OIL AND SUNFLOWER OIL

Article number
474_139
Pages
671 – 676
Language
Abstract
The effect of microwave heating on compositional and qualitative characteristics of virgin olive oil, corn oil and sunflower oil samples is studied in this work.
The oils were heated in a microwave oven at two intensities (low and medium). Increase in intensity and time of exposure caused no marked differences either in free acidity or in fatty acid composition of olive oil, corn oil and sunflower oil.
The sum of trans linoleic and linolenic acid isomers was higher in corn oil than in sunflower oil.
The peroxide values and the extinction coefficients K232, K270 of olive oil samples increased during microwave treatment while the oxidative stability, as determined by Rancimat apparatus, decreased.
The oxidative stability of virgin olive oil even after treatment remained much higher compared to the other seed oils examined.
Treatment of olive oil samples in medium intensity for 10min resulted in K270 value to exceed the limit of 0.2 set by the EC Regulation for the extra virgin olive oil.

Publication
Authors
E. Stefanoudaki, A. Koutsaftakis, F. Kotsifaki
Keywords
virgin olive oil, seed oils, quality, microwave heating
Full text
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