Technochemical characteristic and prospects of utilization for grenadier liver

Three species of grenadiers dwell in the North Pacific waters of Russia. Their liver weights 4-7 % of the body weight but is never used. Its utilization for BASF production is proposed. For this purpose, chemical composition and properties of liver from the grenadier Albatrossia pectoralis are investigated. Content of inorganic cations, including toxic ones, in the liver satisfies the allowed standards. Wet liver contains 30 % of proteins and 68 % of lipids, mainly triacyl-glycerides (90 %) and phospholipids (4.5 %). The oil extracted from the liver has the acid number 1.8 KOH/g and the peroxide number 6.4 mmol after three months of frozen storage. Microbiological parameters of the liver are satisfactory after three months of frozen storage, too. Chitosan-lipid complex is prepared by treatment of water extract from the liver tissue (extracted by 5 : 1 solvent of water and natrium hydroxide during 15 hours at the temperature 10-15^oC and centrifuged) with chitosan solution and 3-hour sedimentation from water-soluble fraction. It contains mostly lipids (> 80 %, 23 % of them are saturated fatty acids, 73 % - monounsaturated fatty acids, and 4 % - polyunsaturated fatty acids) and a big amount of essential amino acids, so it could be used as a raw material for restorative BASF production. On the contrary, the water-soluble fraction is poor by proteins and free amino acids; its antioxidant activity is low. The raw oil from grenadier liver could be used in technics or veterinary.

grenadier, liver, oil, lipid, amino acid, chitosan-lipid complex, BASF

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