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KMID : 1007519980070030197
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Food Science and Biotechnology
1998 Volume.7 No. 3 p.197 ~ p.200
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Spectrophotometric Determination of Alkaline Contaminant Materials (ACM) in Frying Oil
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Gil, Bogim
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Abstract
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Alkaline contaminant materials (ACM) have been suggested as the most potent surgactant in lowering interfacial tension of frying oil. To determine alkaline contaminant materials (ACM) in frying oil, the light absorbance of the indicator dye (bromophenol blue) solution which extracts the ACM from oil was measured spectrophotometrically. The same volume of test measured and oil were mixed together and then the clear upper solution was analyzed. The absorbances of upper solutions with increasing concentration of sodium oleate, one of the ACM dissolved in fresh soybean oil, were measured at wavelengths from 400 nm to 60 nm, A linear regression plot of absorbance as a function of the concentration of sodium oleate was drawn at 420 nm of absorption maximum to obtain a standard curve. The amount of ACM in frying oil calculated by the regression equation increased from 6 ppm to 90 ppm as the frying period increased from 0 day to 5days. This test solution also can be used for a quick test kit for rapid checking of oil quality by compring its color with the reference color scale, which is the measurement of the concentration of sodium oleate in fresh soybean oil.
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