Detection of interesterified fats in hydrogenated fats |
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Authors: | S Adhikari J Adhikari |
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Affiliation: | (1) Ganesh Scientific Research Foundation, 64-65, Najafgarh Road, 110015 New Delhi, India |
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Abstract: | Interesterification of fats is being used increasingly as an alternative to hydrogenation in preparing shortening and margarine
bases. The detection of interesterified fats in vanaspati (a hydrogenated fat) is relevant because of possible adulteration
problems. Either palmitic acid-rich or stearic acid-rich interesterified fats were blended with 13 market samples of hydrogenated
fat (vanaspati) and examined by on-plate lipase hydrolysis of glycerides, gas chromatographic determination of fatty acids
of the isolated 2-monoglycerides and calculation of two emperical indices. These were R1, the ratio of the amounts of palmitic acid present in the 2-position to that in the total glyceride, and R2, the ratio of saturated acid present in the 2-position to total saturated fatty acid in the fat. The vanaspati, R1 was always below 10 and R2 was always below 20. The presence of 5–10% interesterified fat raised both figures and offered a suitable basis for the detection
of interesterified fats in hydrogenated fats. |
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Keywords: | Detection hydrogenated fats interesterified fats lipase hydrolysis thin-layer chromatography vanaspati |
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