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KMID : 0903519940370030168
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1994 Volume.37 No. 3 p.168 ~ p.174
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Effects of Filtration or Centrifugation on the Oxidative Stabilities of Sesame oil
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Abstract
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Effects of filtration and centrifugation on they oxidative stabilities of sesame oils during storage at 70℃ were studied by combination of determining peroxide values and conjugated dienoic acid values of oils and measuring the hexanal formation using headspace gas chromatography. Crude sesame oil from roasted seeds contained more free fatty acids, conjugated dimes, and metals (Fe, Cu, Mg and Zn); on the other hand, higher contents of moisture and γ-tocopherol were found in the filtered or centrifuged oil. Only filtered oil contained more peroxides than the crude oil in spite of the color advantage of the highest L and b values among three oils. All the oils showed the tendency of increasing in total color difference during storage at 70℃, fatty acid compositions were relatively constant except for decreasing tendency of linoleic acid in filtered oil. No significant difference at 1% in the oxidative stabilities was observed between centrifuged oil and crude oil with higher susceptibility to the oxidation in the filtered oil. Centrifuged sesame oil was the best in the aspect of both oxidative stability and the oil color.
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