Abstract
Heat of fusion of 1-monopalmitin was determined using Perkin-Elmer DSC-1 differential scanning calorimeter based on the heat of tin. The DSC analyses were done as follows; 510mg of the sample was placed in an aluminum pan which was placed in a sample holder. An empty pan was put in the reference holder. Heating rate and sensitivity were 10°C/min and range 16, respectively. 1-Monopal-mitin and 2-monopalmitin were prepared by the interesterification of methylpalmitate with glycerol or the acylation of 1, 3-benzylidene glycerol with palmitoyl chloride.
The evident differences were observed between the initial melting curve and the repeated heating curves of pure 1-monopalmitin. The original melting curve shows the endotherm corresponding to the melting of β-form. The repeated heating curves had two endothermic peaks corresponding to sub-α-transformation and the melting of α-form.
