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Comparison of supercritical CO 2 and hexane extraction of lipids from sorghum distillers grains
Author(s) -
Wang Lijun,
Weller Curtis L.,
Schlegel Vicki L.,
Carr Timothy P.,
Cuppett Susan L.
Publication year - 2007
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/ejlt.200700018
Subject(s) - hexane , extraction (chemistry) , chemistry , supercritical fluid , distillers grains , sorghum , yield (engineering) , food science , solvent , chromatography , organic chemistry , agronomy , materials science , biology , metallurgy
Total yields and compositions of sorghum dried distillers grains with solubles (DDGS) lipids obtained by supercritical CO 2 (SC‐CO 2 ) extraction were compared with those obtained by recirculated solvent extraction (RSE) with hexane. The total yield of lipids obtained by SC‐CO 2 extraction at 27.5 MPa and 70 °C was 150 g lipids/kg DDGS, while the yield obtained by RSE with hexane at 69 °C was only 85 g lipids/kg DDGS. The contents of four high‐value compounds, i.e. , policosanols, phytosterols, free fatty acids (FFA) and tocols, in the lipids obtained by SC‐CO 2 extraction were 31.2, 15.6, 155.3 and 0.50 mg/g at 27.5 MPa and 70 °C, compared to 26.6, 9.6, 57.3 and 0.03 mg/g for RSE with hexane at 69 °C. The profiles of phytosterols and FFA in the sorghum DDGS lipids were relatively independent of the extraction methods and operating conditions.