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Molecular distillation and characterization of diacylglycerol-enriched palm olein


Yeoh, Chiou Moi and Phuah, Eng Tong and Tang, Teck Kim and Siew, Wai Lin and Abdullah, Luqman Chuah and Choong, Thomas Shean Yaw (2014) Molecular distillation and characterization of diacylglycerol-enriched palm olein. European Journal of Lipid Science and Technology , 116 (12). pp. 1654-1663. ISSN 1438-7697; ESSN: 1438-9312


Lipase-catalyzed glycerolysis of palm olein was used to produce a mixture of acylglycerols with ∼34-wt% of DAG. The reaction conditions were 5-wt% of Lipozyme TLIM at 55°C and 8 h of reaction time. For commercial purposes, it is required to purify the product up to 80-wt% DAG and with free fatty acids (FFA) content below 0.1-wt%. A single-step distillation process was not sufficient to meet this product requirement. Two distinct 2-step short path distillation approaches were then studied. First scheme involved the removal of TAG by initial distillation step at 250°C, followed by separation of the MAG and FFA from distillate obtained at 180°C during second distillation step at vacuum pressure of 0.1 Pa. Second scheme involved the removal of MAG and FFA in first step at 180°C prior to purification of DAG from residue at 250°C during second distillation step at vacuum achieved up to 0.1 Pa. The results suggested that the first scheme of 2-step distillation operation was able to achieve 89.9-wt% of DAG purity without exceeding the limit of 0.1-wt% of FFA. A final yield of 21.5-wt% and DAG recovery of 47.8% were obtained using the first scheme. A detailed DAG profile was identified and product characterizations such as fatty acid composition, slip melting point, and solid fat content profile were also investigated. It was observed that purified-DAG product showed lower iodine value and higher slip melting point than raw material palm olein. The final product had 1134 ± 10 ppm tocols content.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Institute of Bioscience
Institute of Tropical Forestry and Forest Products
DOI Number: https://doi.org/10.1002/ejlt.201300502
Publisher: Wiley
Keywords: DAG; Glycerolysis; Palm olein; Short path distillation
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 18 Jan 2016 06:37
Last Modified: 18 Jan 2016 06:37
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1002/ejlt.201300502
URI: http://psasir.upm.edu.my/id/eprint/34579
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