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Quantitative determination of conjugated linoleic acids in hydrogenated vegetable oils using refractive index
Mun Yhung Jung1, Ji Su Park2, Suk Hoo Yoon3
1Department of Food Science and Culinary Art, Woosuk Unversity, Samnye, Jeonbuk, 55338 Korea.
Abstract:
Conjugated linoleic acid contents in hydrogenated vegetable oils were differentially determined using refractive indices when the iodine value could not be used. The refractive indices of soybean oil, cottonseed oil, and corn oil varied linearly with changes of linoleic acid contents of individual oils with determination coefficients of 0.91, 0.98, and 0.98, respectively. The refractive index can be used as a simple and fast method for control of the hydrogenation process of vegetable oils to obtain a desired conjugated linoleic acid content without fatty acid compositional analysis.
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