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Fasina, O.O.; Craig-Schmidt, M.; Colley, Z.; Hallman, H.
Food science & technology, 01/2008, Letnik: 41, Številka: 8Journal Article
The enthalpy and melting characteristics (onset melting temperature, endset melting temperature, peak melting temperature and enthalpy of melting) of 12 vegetable oils were experimentally determined within a temperature range of −60 and 25 °C by means of a differential scanning calorimeter. Data obtained showed that vegetable oils melt over a wide temperature range (19–44 °C). The enthalpy required to increase the temperature of the vegetable oil samples from −60 to 25 °C was between 241.1 and 325.7 kJ/kg. Results from fatty acid composition indicate that the amount of the monounsaturated or polyunsaturated is highly correlated ( R 2>0.91) with the onset melting temperature, peak melting temperature and enthalpy of melting for the 12 vegetable oil samples. Poor correlation ( R 2<0.27) was obtained between the melting characteristics and the amount of saturated or unsaturated fatty acid. A linear equation was therefore used to relate each of the melting characteristics of a vegetable oil sample to the amount of monounsaturated or polyunsaturated fatty acid. The models developed are valuable for predicting material behavior and for modeling processing operations for vegetable oils.
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