Optimisation of yield and rancid stability of oil extracted from squid (Illex argentinus) viscera by eco-friendly processing

Póster.-- 2nd edition of the Conference Lipids in the Ocean, from 5 to 7 of July 2021, onlineMarine by-products constitute a main concern for current fishery management policies and legislations and represent a significant source of valuable bioactlve compounds. The current study was focused on the oil extraction from viscera components resulting from the commercialisation of Argentine shortfin squid (llltx argtnUnus), a highly important economic resource for global fisheries. An eco-friendly extraction methodology was applied, this consisting of a wet pressing method including a partlal drying step, centrifugation and oil collection at the top layer. In order to maximise the oil yield and the nutritional value (content on docosahexaenolc and eicosapentaenoic acids, DHA and EPA), and minimise the oil oxidation degree, a response surface methodology design was developed focused on the drying conditions (4S-85 ºC, 30-90 mln), As a result, an Increase or drying time and temperature provided an increase of the lipid yield recovery from viscera; thus, the strongest drying conditions showed an 85% value when compared with the lipid recovery by the traditional chemical method. Meantime, DHA and EPA contents In oil revealed a low dependence on drying conditions, leading to 12-14 and 21-24% In total fatty acids, respectively. Levels of peroxides and conjugated dienes did not show extensive differences by comparing oils obtained from the different drying conditions; however, the polyene index led to a slight decrease when increasing the treatment strength. The optimisation study revealed the need for employing moderate drying conditions to obtain a low-level oxidised oil while attaining high oil yields including nutritionally-valued w3 fatty acidsN