Nutritional and bioactive oils from salmon (Salmo salar) side streams obtained by Soxhlet and optimized microwave-assisted extraction

The efficiency of the microwave-assisted extraction (MAE) technique on recovering nutritional and bioactive oils from salmon (Salmo salar) side streams was evaluated and compared to Soxhlet extraction. The response surface methodology (RSM) coupled with a central composite rotatable design was used to optimize time, microwave power, and solid/liquid ratio of the MAE process in terms of oil yield. The optimal MAE conditions were 14.6 min, 291.9 W, 80.1 g/L for backbones, 10.8 min, 50.0 W, 80.0 g/L for heads, and 14.3 min, 960.6 W, 99.5 g/L for viscera, which resulted in a recovery of 69% of the total lipid content for backbones and heads and 92% for viscera. The oils obtained under optimal MAE conditions showed a healthy lipid profile as well as cytotoxic, antioxidant, anti-inflammatory, or antimicrobial properties. These results highlight that oils from underutilized salmon by-products could be exploited by different industrial sectors under the circular economy approach.

Keywords

Salmon side streams Fish oil Fatty acids Microwave-assisted extraction (MAE) Bioactive properties Cellular assays

URI

http://hdl.handle.net/10198/25442

Citation

Fuente, Beatriz de la; Pinela, José; Mandim, Filipa; Heleno, Sandrina A.; Ferreira, Isabel C.F.R.; Barba, Francisco J.; Berrada, Houda; Caleja, Cristina; Barros, Lillian (2022). Nutritional and bioactive oils from salmon (Salmo salar) side streams obtained by Soxhlet and optimized microwave-assisted extraction. Food Chemistry. ISSN 0308-8146. 386, p. 1-10