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Quantification of Lipid Extraction from Grain Sorghum DDG

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  057054,  2005 ASAE Annual Meeting . (doi: 10.13031/2013.19668) @2005
Authors:   Lijun Wang
Keywords:   solvent extraction, sorghum lipids, sorghum DDG, kinetics

Soxhlet and recirculated solvent extraction methods were used to extract lipid materials from grain sorghum DDG. The lipid content in DDG with a moisture content of 6.7 % (dry basis) was as high as 9.32% of the dried mass determined by the Soxhlet extraction with nhexane. There was a slight increase in the lipid yield from 9.21% to 9.68% when the moisture contents increased from 2.1 % to 17.4 % (db). TLC analysis showed the sorghum lipids were composed of triacylglycerols, fatty acids, fatty alcohols, aldehydes, sterols, wax and steryl esters. A bench-scale recirculated extraction system was used to investigate the extractability of lipid materials from the DDG under various experimental conditions including solvent to solid ratio (2:1 5:1), extraction temperature (45, 55, 68oC) and extraction time (1 6 hr). The extractability of DDG lipid ranged from 70.3% to 94.5 %. At extraction temperatures near the boiling point of n-hexane, a solvent to solid ratio of 3:1 and an extraction time of 4 hr achieved the maximum lipid yield. There was no apparent increase in the extraction yield with further increase of the solvent to solid ratio or extraction time.

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