The research is devoted to the use of a cod skin hydrolysate as a component of citrus fruit beverages. It is demonstrated that the addition of a hydrolysate increases the content of protein in the beverage, slightly increases the viscosity of the beverage, and does not adversely affect its sensory characteristics. Hydrolysate is produced by enzymatic treatment of cod skin. The processing parameters allowing achieving the desired degree of destruction are determined. Physico-chemical parameters and sensory analyses of the obtained hydrolysate and its amino acid composition were analyzed. The influence of collagen hydrolysate on the physical and chemical composition of beverages, their structural and mechanical characteristics (pH and viscosity) and sensory analyses are estimated.

Waste from fish cutting (heads, swim bladders, fins, skin, and bones) is a high-value technological raw material for obtaining substances and products with a wide range of properties. The possibility of using waste from cutting fish of the Gadidae family: the Alaska pollock (Gadus chalcogrammus) and the Pacific cod (Gadus macrocephalus), processed in the coastal zone, is scientifically substantiated. In this work, a technology has been developed for processing accumulated waste from fish cutting in order to obtain fish gelatin, which is characterized by high protein content (more than 80.0%) and a full set of essential and nonessential amino acids. We studied the quality of fish gelatin obtained from wastes from cutting the fish of the Gadidae family. The possibility of using fish gelatin as a component of fish products is shown; the dose of its introduction into the fish products is substantiated. The data obtained made it possible to recommend the use of fish processing waste products as a gelling component and a source of amino acids in multicomponent food systems.

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The paper presents research data justifying the relevance of developing a ready-to-eat food product in the form of freeze-dried snacks based on a homogenized fish-vegetable system. Recipe formulations are substantiated and the technology of four freeze-dried snacks using fish and vegetable raw materials is developed, which allows to obtain a high-protein product containing polyunsaturated fatty acids, dietary fiber and minerals. Studies of the quality indicators of the developed finished products made it possible to establish its high nutritional, in particular biological value: snacks in their composition contain dietary fiber), in particular fiber (7.05-23.77%) and inulin (4.35%), polyunsaturated fatty acids of the omega - 3.6 group (ω-3: 45.52-49.43% and ω-6: 5.48-6.98% of the total fatty acids), as well as trace elements such as iodine (0.021%), which allows us to recommend them as functional foods for the diet of the population.

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