Total yields and compositions of sorghum dried distillers grains with solubles (DDGS) lipids obtained by supercritical CO2 (SC-CO 2) extraction were compared with those obtained by recirculated solvent extraction (RSE) with hexane. The total yield of lipids obtained by SC-CO2 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-CO2 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.
- Dried distillers grains with solubles
- Hexane extraction
- Supercritical CO extraction
ASJC Scopus subject areas
- Food Science
- Industrial and Manufacturing Engineering