Abstract
The methyl esters of palm oil, which consists of saturated and unsaturated esters (0.6 to 95.9% unsaturation) of the C12 to C18 fatty acids, solidify at the two temperature ranges, -52 to -45°C and -24 to 21°C, when the esters are cooled. When the esters are heated, they melt at two distinct temperatures, -25 and -33°C and a broad peak at -9 to 28°C. The heating thermograms also showed an exothermic crystallisation peak in between two endothermic melting peaks, indicating the occurrence of re-crystallisation of low melting methyl esters into higher melting point crystal and then melt again at higher temperature.
Highlights
Differential scanning calorimetry (DSC) measurement is a function of differential heat flow with temperature for compounds that exhibit thermal transitions such as melting and crystallisation[1]
Crystallinity of lipids has been studied by using DSC, which examines the crystallisation and well as the melting behaviours[39] but such studies have largely been confined to investigations on triacylglycerols of edible oils, especially on their liquid fractions
The objective of the present study was to examine the effect of fatty acid composition (FAC) of palm oil methyl esters on their thermal behaviour
Summary
Differential scanning calorimetry (DSC) measurement is a function of differential heat flow with temperature for compounds that exhibit thermal transitions such as melting and crystallisation[1]. This measurement provides qualitative and quantitative information about physical and chemical properties that involve endothermic and exothermic processes. Unlike palm oil and palm oil products, which have been widely investigated using DSC for their thermal behaviour in finished food products, the application of DSC on palm oil methyl esters has not been reported extensively. Few reports document the use of the technique to study the use of methyl esters of edible oils. DSC technique was used as an analysis tool in the winterization study on methyl esters of soybean oil[10] and waste cooking oil methyl esters[11]
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