Partition coefficient of diglycerides in crystallization of palm oil |
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Authors: | Wai-Lin Siew Wee-Lam Ng |
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Affiliation: | (1) Department of Chemistry, University of Malaya, 59100 Kuala Lumpur, Malaysia;(2) PORIM, P.O. Box 10620, 50720 Kuala Lumpur, Malaysia |
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Abstract: | Crystallization of palm oil with and without solvent was carried out over a temperature range of 10–25°C. The yields of olein,
the diglyceride contents, and compositions of the stearin and olein phases were determined by thin-layer and gas-liquid chromatography.
The three major diglycerides, analyzed as C32, C34, and C36, are mainly dipalmitoyl glycerol, palmitoyloleoyl glycerol, and dioleoyl glycerol. In crystallization without solvent, C32 (PP) had a strong affinity for the stearin fraction and C36 diglycerides concentrated in the olein phase. The partition coefficient of diglycerides between the olein and stearin phases
was temperature-dependent and was influenced by the type of solvent used. Although solvent enhances the diglyceride partition
into the olein phase, partitioning is more effective at low temperatures and with acetone as the solvent for fractionation. |
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Keywords: | Diglycerides dry fractionation fractionation olein palm oil partition coefficient solvent fractionation stearin winterization |
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