Feasibility and quality constraints of solvent-free fish oil recovery from European seabass (Dicentrarchus labrax) by-products following a 48-hour cold storage delay
Makaleler > Tam Makale · 2026
Yazarlar: Ömer Alper ERDEM, Nida Demirtaş Erol Demirtaş Erol
Ege Journal of Fisheries and Aquatic Sciences, Uluslararası, 2026, ss 341-341
Özet
Industrial logistics and unavoidable processing delays frequently hinder the valorization of aquaculture by-products into high-value lipids. The current study evaluated the feasibility of a solvent-free centrifugal extraction technique for the recovery of fish oil from European seabass (Dicentrarchus labrax) fillet by-products (head, skeleton, and internal organs), following a standard 48-hour cold storage delay typical in industrial processing. The by-products were homogenized with water at 50 °C and subsequently centrifuged at 4000 × g for 25 minutes. This solvent-free extraction technique yielded 8.12% free liquid oil, corresponding to a lipid recovery efficiency of 63.36%. Gas chromatography analysis demonstrated that the recovered oil contained substantial levels of docosahexaenoic acid (DHA) and total polyunsaturated fatty acids, representing a valuable nutritional profile. However, an accumulation of primary oxidation products was observed following the 48-hour pre-processing delay, with peroxide values exceeding permissible limits in both the solvent-free (27.99±3.99 meq O2/kg) and solvent-assisted (22.67±1.15 meq O2/kg) oils. Conversely, the free fatty acids (6.77±0.08% oleic acid) and p-anisidine value (4.29±0.26) remained within acceptable ranges. These findings demonstrate that while solvent-free centrifugation is effective for recovering PUFA-rich lipids, the inherently high pro-oxidant content of seabass by-products highlights the importance of immediate, on-site processing to prevent rapid oxidative degradation. Consequently, this study establishes critical logistical baselines for circular economy implementations in the seafood processing sector.