Laboratory Studies on Membrane Deoiling of Lecithin |
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Authors: | S Manjula R Subramanian |
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Affiliation: | (1) Department of Food Engineering, Central Food Technological Research Institute, Mysore, 570 020, India |
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Abstract: | Deoiling of lecithin using a nonporous membrane was examined in a favorable solvent (hexane) medium with soy and rice bran
lecithins. During the membrane process, the acetone insoluble (AI) content of soy lecithin increased from 63.2 to 81.0% in
a single step batch operation. The membrane exhibited an excellent selectivity since phospholipid (PL) reverse micelles formed
in the system were rejected almost completely due to low solubility probably aided synergistically by size exclusion. Diafiltration
achieved greater oil removal from lecithin as reflected in terms of higher AI and PL contents in the deoiled lecithin. In
discontinuous diafiltration, the PL content increased from 33.3 to 85.5% in rice bran lecithin (150% dilution to feed) and
56.6 to 85.7% in soy lecithin (200% dilution), respectively. The simulated continuous diafiltration run showed slightly greater
PL content in soy lecithin (91.3%) compared to discontinuous diafiltration (89.7%) besides offering higher productivity. The
membrane showed a color reduction of ~60% in soy lecithin but there was no improvement in rice bran lecithin due to the retention
of degradation products. The proposed integrated membrane process with nonporous (deoiling) and nanofiltration (solvent recovery)
membranes could be an attractive preposition besides being an acetone free process. |
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Keywords: | Acetone-free deoiling process Nonporous membrane Phospholipid Rice bran lecithin Soy lecithin |
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