Producing Collagen-Containing Ichthyosubstance from Secondary Fishery Resources

Background. Industrial processing of fish is accompanied by an increase in the amount of secondary resources and waste, and the total amount of waste can reach 60% of the total fish weight, which implies their processing into collagen-containing products.

Purpose. To study the possibility of extracting collagen-containing ichthyosubstance from the fish wastes of the Astrakhan Region and study its qualitative characteristics.

Materials and methods. The following wastes from the separation of pelagic fish species have been chosen as the objects of studies. Collagen-containing ichthyosubstance obtained according to an improved technology was also used as an object of research. At carrying out of experiments generally accepted standard, and also modified modern methods of organoleptic, physico-chemical, microbiological researches have been used.

Results. The use of scales with skin as raw material for filleting has been substantiated on the basis of the mass composition of the partial raw material. The technological scheme of obtaining collagen-containing ichthyosubstance is given. The method of extraction - grinding samples, cooking at 65-80 0C with forced mixing (18-20 rpm), followed by filtration and centrifugation. According to the data obtained the acidity is on the average 4.5, the dry matter content is 13 % and ash content - 3.6 %, which will allow to obtain high indices of dynamic viscosity and to send the separated product for further testing to determine the application field.

Conclusions. The results of the study demonstrated that it is possible to obtain collagen-containing ichthyosubstance from the skin of pike (Esox lucius) and pikeperch (Lucioperca lucioperca) scales. The resulting product has a wide range of properties suitable for various applications. The optimized technology gives a product yield of up to 70% of the weight of raw materials and provides high resistance to microorganisms during long-term storage. The combination of physico-chemical properties provides a basis for further studies in order to determine the scope of application. The materials that can be obtained using ichthyosubstance are environmentally friendly and biodegradable, since no synthetic substances have been used in their composition.

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