ISSN:
1745-4522
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Physical properties of lipid fractions isolated from anhydrous butter oil under various experimental conditions using supercritical carbon dioxide (SC-CO2) extraction, intereseterification or their combination, together with thermal modification were assayed in terms of triacylglycerol and fatty acid profiles. SC-CO2 process, at 35C and 2000 psi, preferentially extracted the low-molecular-weight triacylglycerols, did not result in any separation of cholesterol and extracted an approximately constant fraction (7%) of the material in each 2h interval. Combination of SC-CO2 extraction with thermal fractionation yielded a butter oil fraction with improved spreadability at refrigerator temperatures. At higher pressure and longer extraction time SC-CO2 resulted in decreased solvent selectivity without increased extraction yield. The triacylglycerol and fatty acid profiles of high pressure 6000 psi extracts were remarkably similar to those of the butter itself. Chemical interesterification of butter oil randomized the constituent fatty acids, giving products which contained higher proportions of the middle-range constituents. Thermal fractionation of interesterified butter yielded products only slightly enriched in higher molecular weight triacylglycerols, but interesterification of a solid obtained from thermal fractionation of butter gave a product greatly enriched in these compounds. Thus, modified lipid samples with distinct triacylglycerol and fatty acid compositions were prepared which may be used in different industrial applications.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1745-4522.1994.tb00247.x
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