Nature of the Residual Lipids in Fish Protein Concentrate (FPC)

SUMMARY— Methods were developed for the extraction and characterization of residual lipids of fish protein concentrate (FPC). Isopropanol‐extracted samples had 0.1–0.2% residual lipid and an ethylene dichloride‐extracted sample had approximately 0.5% residual lipid. The lipids contained 50–60% neutral lipid, 20–25% phospholipids, 5–10% acidic lipids, and the remainder uncharacterized. Fatty acid analysis of the total lipids showed that the saturated fatty acids were mainly palmitic and stearic and the unsaturated fatty acids were mainly oleic and palmitoleic. The observed low content of polyenoic fatty acids may account in part for the high stability of the lipid extracts to oxidation.