Chemical composition of dried eyeballs from Euphausia superba and Euphausia pacifica

摘要

Dried krill eyeballs were obtained from Euphausia superba and Euphausia pacifica by using a patented industry method and their chemical compositions were examined. Crude protein content was 77.7% and 80.8% of the dry matter of E. superba and E. pacifica, respectively. The dominating amino acids in both krill were glutamic acid, aspartic acid, glycine, arginine, leucine and tyrosine. Crude fat content was 10.9% and 5.4% of dry matter of E. superba and E. pacifica, respectively. The main lipid class of the extracted lipids was phospholipids at 88.5% in E. superba and 96.4% in E. pacifica. The dominating fatty acids in both krill were 22:6 (n-3), 20:5 (n-3); 16:0 and 18:1 (n-9). Astaxanthin (3, 3′-dihydroxy-β, β-carotene-4, 4′-dione) content of E. superba and E. pacifica was 566 mg/100 g and 252 mg/100 g of dry matter, respectively. Retinol of E. superba and E. pacifica was 153.0 mg/100 g (510 000 IU/100 g) and 57.6 mg/100 g (192 000 IU/100 g) of dry matter, respectively. The lipophilic extract of E. superba by using n-hexane contained 1923 mg/100 g of astaxanthin at approximately four times higher than the dried eyeballs.