Effects of filtration through activated carbons on peroxide,thiobarbituric acid and carbonyl values of autoxidized soybean oil |
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Authors: | Keito Boki Tetsuyuki Wada Shinsaku Ohno |
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Affiliation: | (1) Faculty of Pharmaceutical Sciences, Kinki University, Kowakae 3-4-1, 577 Higashi-Osaka, Japan |
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Abstract: | Effects of filtration bleaching on peroxide value (PV), thiobarbituric acid value (TAV) and carbonyl value (CV) of autoxidized soybean oil were investigated by using twenty-three kinds of activated carbon in order to improve oil quality. From the decreases in PV, TAV and CV and from the physical and chemical properties of activated carbons, it was suggested that hydroperoxides, aldehydes and ketones were adsorbed on the acid sites distributed over the surface or within the pores of the activated carbons while the autoxidized soybean oil flowed through the packed column. The residual tocopherols in autoxidized soybean oil and treated soybean oil were determined during storage. The decrease in oxidative stability of treated soybean oil seemed to be caused by elimination ofα-,β-andγ-tocopherols.δ-Tocopherol was chemically more stable thanα-,β- andγ-tocopherols in autoxidized soybean oil. |
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Keywords: | Acidity activated carbon autoxidized soybean oil bleaching effect carbonyl value peroxide value specific surface area storage thiobarbituric acid value tocopherol |
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