Assessment of the potential of lipids of secondary fish raw materials as a biotechnological substrate for the synthesis of target products

The relevance of using secondary fish oil is stipulated by its high bio-logical value. Fish waste is a promising source of valuable biologically active sub-stances contained in lipids. The problem with using such oil for food and feed purposes is instability in storage as a result of hydrolytic and oxidative processes. A new direction in the use of oil-containing fish processing waste is its use as a carbon source for the microbial synthesis of products with high added value. The purpose of the work is to study the chemical composition of the quality and biological value of oil isolated by thermal method from large-scale fish processing waste of the Kaliningrad region - smoked sprat heads and fresh mackerel, pike perch entrails. The following values have been established in fish oils: acid value (7.6–12.3 mg KOH / g oil), peroxide value (5.1– 25.7 peroxide oxygen / kg oil), iodine value (129.2–148.7 g I / 100 g oil), saponification value (185.1–201.3 mg KOH / g oil), content of unsaponifiable matter (0.91–3.12%) and non-fat impurities (0.77–2.12%), anisidine value (2.8–15.4 units), thiobarbituric acid value (0.26–1.61 optical unit); mass fraction of moisture (0.28–0.81%). The com-position of fatty acids (FA) in the composition of lipids has been determined and it has been shown that the content of unsaturated acids is 66.25–73.69%; polyunsaturated 21.72–38.45%; long-chain 17.87–47.27%; long-chain polyunsaturated fatty acids of the omega 3 class (EPA 6.26–12.31% and DHA 6.67–25.02%). The results indicate a fa-vorable composition of FA lipids of the studied fats as a new carbon substrate for the biotechnological synthesis of target products.

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