Article
Extraction and characterisation of lipids from Antarctic krill (Euphausia superba)
Food Chemistry
(2011)
Abstract
There is significant commercial interest in oil extraction from krill because it is rich in omega-3 polyunsaturated fatty acids (n-3 PUFA) such as eicosapentaenoic (EPA, 20:5n3) and docosahexaenoic (DHA, 22:6n3) acids. The objectives were to determine oil extraction efficiency using different solvent systems and the composition of extracted oil and spent krill following extraction. Extraction efficiency was the highest (P < 0.05) for one-step extraction using freeze-dried krill with 1:12 or 1:30 krill:solvent ratio (w:v) compared to Folch, Soxhlet, and conventional two-step extraction. Extracted oils contained predominantly phospholipids (20–33%), polar non-phospholipids (64–77%), and minor triglycerides (1–3%). Triglycerides contained much less (P < 0.05) total n-3 (4.0%), DHA (1.1%), and EPA (2.3%), but more (P < 0.05) saturated FA (38.7%) than phospholipids (total n-3-47.4%, DHA-18.0%, EPA-28.2%, saturated FA-23.5%). Antioxidant capacity of krill oil extracted by one-step extraction (9.4–14.2 μmol Trolox Equivalents/ml oil) was generally similar to antioxidant capacity of krill oil extracted by ethanol (22.9), but greater (P < 0.05) than antioxidant capacity of krill oil extracted by acetone (1.2) and Folch method (1.5). The spent krill following oil extraction contained protein (72.9–75.8%, dry basis). Based on the extraction efficiency and composition of the extracted oil, the one-step extraction using 1:12 krill:solvent ratio is recommended.
Disciplines
Publication Date
April 1, 2011
DOI
https://doi.org/10.1016/j.foodchem.2010.10.013
Citation Information
Joseph C. Gigliotti, Matthew P Davenport, Sarah K Beamer, Janet C. Tou, et al.. "Extraction and characterisation of lipids from Antarctic krill (Euphausia superba)" Food Chemistry Vol. 125 Iss. 3 (2011) p. 1028 - 1036 ISSN: 0308-8146 Available at: http://works.bepress.com/joseph-gigliotti/13/