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Vol. 21 (2018 year), No. 3, DOI: 10.21443/1560-9278-2018-21-3
Golubeva O. A., Titova S. A., Grekov E. O.
Cryoextrusion in technology of fish feed production
The process of grinding the frozen fish raw materials using the useful model of a piston-type extruder with cooled working bodies has been investigated. A new feed product – cryo minced fish feed – has been obtained. The possibility of replacing the standard manufacturing operations of the defrosting and subsequent grinding of raw materials by one operation of cryoextrusion has been justified. Planning of the experimental part has been performed by the method of combination squares. During the experiment, the volume of samples, their specific surface area, mass, initial and final temperatures of the working chamber, the temperature of raw materials, the temperature of the resulting minced meat, the pressure force, the time of the experiment, the mass of waste have been determined. The rational shape and size of the die holes for the extrusion of raw materials have been determined. It has been found that when using a nozzle with the "hourglass" shape of holes with a diameter of 4.5 mm and 7 mm, the duration of the extrusion process for the studied fish species is 47 to 130 s. The finished product – cryo minced fish feed – has a fairly homogeneous structure and juicy texture, the temperature in the thickness of the product is equal to the temperature of the raw material before its processing (–18 °C). The granulometric composition of the cryo minced fish feed using the sieve analysis has been determined. The statistical processing of the results of experiments to determine the pressure of frozen fish raw material by the method of nonlinear regression has been carried out using the program DataFit version 9.1.32. The regression equation describing the influence of the complex parameter – the coefficient of the hole shape, taking into account the diameter and shape of the matrix hole, and the degree of grinding of raw materials on the force of extrusion has been obtained. The expediency of using the matrix "hourglass" which allows to obtain the lowest pressure force for bony fish of the North Sea basin has been proved.
(in Russian, стр.6, fig. 3, tables. 1, ref 8, adobe PDF, adobe PDF 0 Kb)
Vol. 22 (2019 year), No. 3, DOI: 10.21443/1560-9278-2019-22-3
Golubeva O. A., Grekov E. O., Titova S. A.
Extrusion in the production technologies of North Basin cartilage fish
Nowadays one of the main tasks of developing domestic fishery complex is increasing efficiency of aquatic biological resources (ABR) extraction and optimizing their processing. The increased pace of processing of ABR is associated with the searching and introduction of energy-saving, low-waste and non-waste technologies in order to increase the quantity and expand the variety of types of both feed and food products. Stellate stingray is a valuable raw material containing a significant amount of high-quality protein, as well as a number of important trace elements for nutrition. There is a high concentration of chondroitin sulfate in the stingray meat that makes it an indispensable component in functional nutrition, as well as in the creation of special feeds. As a result of the study, rational modes of grinding Stellate stingray meat with extrusion have been recommended for using. The feasibility of using different matrices for different conditions of raw materials has been substantiated. Regression equations has been obtained for describing the effect of a complex parameter – the coefficient of the geometric shape of the hole taking into account both the diameter and the shape of the matrix hole, and the degree of grinding of raw materials on the grinding pressure. The grinding matrix with 8/7/8 "cone – cone" type openings is recommended for use in the production of feed stuffing from thawed stingray, as it allows to get grinding pressure close to the minimum and 31.33 ± 0.94 kgf/cm2 (3.07 ± 0.09 MPa) with a grinding degree of 3.09. For a blanched slope, it has been recommended to use a matrix with holes like 5.5/4.5/5.5 "cone – cone" which allows to obtain minced meat with the highest content of cartilage 14.38 ± 0.52 g per 100 g of blanched raw the pressure of 7.63 ± 0.27 kgf /cm2 (0.75 ± 0.02 MPa) and a grinding degree of 11.41. Therefor using the extrusion in the processing of North Basin fish raw materials allows to get both feed and food semi-finished products suitable for consumption and further processing.
(in Russian, стр.7, fig. 4, tables. 3, ref 11, AdobePDF, AdobePDF 0 Kb)