Silage for upcycling oil from saithe ( Pollachius virens ) viscera - Effect of raw material freshness on the oil quality.

Autor:	Meidell LS; Norwegian University of Science and Technology (NTNU), Sverres gate 12, 7012, Trondheim, Norway., Slizyte R; SINTEF Ocean, Brattørkaia 17C, 7010, Trondheim, Norway., Mozuraityte R; SINTEF Ocean, Brattørkaia 17C, 7010, Trondheim, Norway., Carvajal AK; SINTEF Ocean, Brattørkaia 17C, 7010, Trondheim, Norway., Rustad T; Norwegian University of Science and Technology (NTNU), Sverres gate 12, 7012, Trondheim, Norway., Standal IB; SINTEF Ocean, Brattørkaia 17C, 7010, Trondheim, Norway., Kopczyk M; Scanbio Marine Group, Bjugnveien 242, 7160, Bjugn, Norway., Falch E; Norwegian University of Science and Technology (NTNU), Sverres gate 12, 7012, Trondheim, Norway.
Jazyk:	angličtina
Zdroj:	Heliyon [Heliyon] 2023 Jun 03; Vol. 9 (6), pp. e16972. Date of Electronic Publication: 2023 Jun 03 (Print Publication: 2023).
DOI:	10.1016/j.heliyon.2023.e16972
Abstrakt:	The main objective of this study was to investigate how the freshness of saithe ( Pollachius virens ) viscera affected the quality, composition and yield of oil obtained by silaging. Minced viscera with and without liver were stored separately for up to 3 days at 4 °C before silaging at pH 3.8 for 6 days at 10 °C. An antioxidant mixture was added to evaluate the effect on the lipid oxidation. Oil was extracted thermally from untreated raw material during storage (day 0-3) and after silaging. For oil obtained after silaging of viscera with liver, the oil yields increased significantly when the raw material was stored for more than one day prior to the treatment. Use of fresh raw material (collected at day 0) led to significantly lower oxidation compared to longer raw material storage. After one day of storage, the oxidation was less dependent on the freshness. Silaging with antioxidants resulted in significantly lower formation of oxidation products compared to acid without antioxidants and the most significant differences were observed after one day of storage. Contents of docosahexaenoic acid (DHA) and total omega-3 fatty acids decreased significantly when the raw material was stored for 1-3 days prior to silaging compared to fresh raw material. Results obtained by high resolution nuclear magnetic resonance (NMR) spectroscopy indicated that oxidation of esterified DHA might explain the DHA decrease. The free fatty acid content was highest when fresh raw material was used and was most likely affected by the formation of cholesteryl esters observed in NMR spectra after longer storage. The study shows that although the oil quality is reduced during silaging, processing shortly after catch and use of antioxidants can optimize the quality resulting in less oxidized oil richer in omega-3 fatty acids. Competing Interests: All authors declare that they have no conflicts of interest regarding the submission and publication of the manuscript “Silage for upcycling oil from saithe (Pollachius virens) viscera – effect of raw material freshness on the oil quality”. (© 2023 The Authors.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu