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Antarctic krill lipid extracted by subcritical n-butane and comparison with supercritical CO2 and conventional solvent extraction
- Sun, Dewei, Cao, Chen, Li, Bo, Chen, Hongjian, Li, Jinwei, Cao, Peirang, Liu, Yuanfa
- Lebensmittel-Wissenschaft + [i.e. und] Technologie 2018 v.94 pp. 1-7
- Euphausia superba, aldehydes, astaxanthin, butanes, carbon dioxide, flavor compounds, lipid peroxidation, lipids, nutritive value, odors, response surface methodology, solvents, volatile compounds
- Antarctic krill lipid has unique biological efficacy, however, the efficient and eco-friendly extraction of its lipid remains a challenge. In this study, Antarctic krill lipid extraction conditions using subcritical n-butane were investigated and optimized by response surface methodology. The optimal extraction conditions using subcritical n-butane were, 120 min dynamic extractions at 40 °C and 1.0 MPa. Lipids extracted by the subcritical n-butane were further compared with those extracted by supercritical CO2 and traditional solvents. Results indicated that the lipid extraction by using subcritical n-butane had a higher lipid recovery rate (81.2 ± 1.5%), higher astaxanthin content (248.4 ± 5.2 mg/kg) and the highest tocopherol content (67.7 ± 3.2 mg/kg). Furthermore, the lipids’ volatile components and flavor components were further investigated. Results revealed that the lipid extracted by subcritical n-butane had lower 1-Penten-3-ol and aldehydes content, indicating less lipid oxidation and higher sulfur-containing compounds which might contribute to the overall aroma of Antarctic krill lipid. Additionally, Antarctic krill lipid extracted by subcritical n-butane had a higher lipid recovery rate and better nutritional quality. Thus, subcritical n-butane could be the best solvent for efficiently extract Antarctic krill lipid.