Journal of New Technology and Materials
Volume 12, Numéro 1, Pages 8-14
2022-06-11
High-temperature Hydrolysis As A Method For Complex Processing Of Sprat (sprattus Sprattus Balticus) By-products
Authors : Mezenova Olga . Baidalinova Larisa . Mezenova Natalya . Agafonova Svetlana . Volkov Vladimir . Verkhoturov Vasilij . Grimm Thomas . Hoehling Axel .
Abstract
This research is very topical due to the problem of processing fish by-products from the production of canned food «Sprats in oil». The aim of the study was to justify the com-plex processing of smoked sprat heads using the method of high temperature thermal hydrolysis. The new technology was tested with fatty (24%) and medium fatty (13%) raw materials using high temperatures in the range of 130-160 °С. As a result, the hydrolyzed organic mass was separated into fat, protein, mineral-protein and protein-fat emulsion fractions. Freeze-drying of the protein fraction and convective drying of the protein-mineral fraction resulted in food additives containing, respectively, low molecular weight water-soluble peptides and high molecular weight insoluble proteins and minerals. A rational method of hydrolysis is substantiated, including preliminary separation of fat in fatty raw materials and its enzymatic-thermal treatment. The optimal values of temperature and duration of hydrolysis in reactor are substantiated. Under these conditions, proteins are extracted most deeply from sprat raw materials, and the content of low molecular weight peptides in the protein freeze-dried hydrolysate powder is more than 80%. A comprehensive technology has been developed for the production of protein, fat and protein-mineral food additives from sprat processing by-products. The balances of organic substances for the main operations were calculated. The additives have pleasant organoleptic characteristics, are sanitary safe, positively tested in some food samples. The developed method for processing of smoked fish by-products is economically viable It allows to produce valuable food products from secondary raw materials and solves the environmental problems of recycling of smoked fish by-products.
Keywords
Smoked Sprat Heads ; Thermal Hydrolysis ; Enzymatic-Thermal Hydrolysis ; Protein Supplement ; Protein-Mineral Fraction ; Emulsion Fraction
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