Effect of Extraction Methods on Quality of Antarctic krill (Euphausia superba) Oil
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Abstract:
Antarctic krill oil has received widespread attention owing to its unique composition and beneficially nutritional and functional properties. The processing quality (peroxide value, acid value, and iodine value) and physicochemical quality (fatty acid composition, vitamin E, and astaxanthin content) of solvent-extracted (SE), twin-pressing-extracted (TPE), and supercritical fluid-extracted (SFE) Antarctic krill oil were evaluated and compared. The oil yield obtained by SFE, TPE (heat-treated, non-heat treated), and SE (chloroform/methanol, ethanol, hexane) approaches was 9.02?10-2, (9.05?10-2, 3.98?10-2), and (14.33?10-2, 12.43?10-2 and 9.14?10-2) g/g, respectively. The peroxide, iodine, and saponification values of SE (ethanol) Antarctic krill oil were superior to those of the other five types tested. The phospholipid content of SFE Antarctic krill oil was superior to that of the other five types. These results provide a basis for the control and preservation of the quality characteristics of Antarctic krill oil extracted using different methods.
