Blackcurrant is the most attractive source of ascorbic acid compared to other berries and fruits. The seasonality of berry production makes think about ways to preserve them. One of the most environmentally friendly ways is to freeze berries. However, in terms of biochemical value, frozen berries differ from fresh ones. After defrosting, a decrease in the content of ascorbic acid, soluble solids and titratable acids is observed in the berries. Analysis of currant berries during the harvest period for the content of heavy metals makes it possible to evaluate the quality of the finished product, used fresh and as raw material for further processing. Preservation of currant berries by freezing led to a change in the content of heavy metals: an increase in manganese, copper, iron and a decrease in nickel, zinc, cadmium, cobalt.
The article reviews the quality issues of poultry products, in particular meat, liver and eggs. The smallest amount of total cholesterol was found in the liver of females (21.4 mmol/l), as well as in the liver of chickens of the brown cross (26.4 mmol/l) in comparison with the white cross. We noted the greatest amount of vitamin E in chickens of white and brown crosses (33.9 and 40.5 mg%). Broiler chickens’ liver was poor in this vitamin (2.43-4.05 mg%). The smallest amount of total cholesterol was found in white poultry meat of the studied crosses (3.6-6.3 mmol/l). Brown eggshell eggs contained less cholesterol and more vitamin E compared to white eggshell eggs. The smallest amount of fat was found in the pectoral muscles of both males and females of the Ross 308 cross. The thigh muscles of the Ross 308 cross chicks contained less fat, but were poor in protein compared to the Iza Flex cross. The nutritional value of broiler meat from the Iza Flex cross is higher compared to the Ross 308 cross. Thus, from a nutritional point of view, it is better to include white poultry meat in the diet, since it contains the least amount of fat and cholesterol compared to dark meat, as well as eggs with brown shells, because they have a reduced total cholesterol content and contain 1.4 times more vitamin E compared to eggs with white shells.
The aim of the research was to establish the functioning of the ATPase enzyme systems of the blood and the longest back muscle of sheep of various breeds and ages. The object of the study was selected according to the principle of analogs of lambs and valukha of Texel and Kuibyshev breed, the feeding conditions and content of which corresponded to the current standards developed by the survival permit. It was established that the activity of Mg2 +, Na +, K + -, Mg2 + - and Na +, K + -ATPases in the membrane of erythrocytes of lambs is determined by age with a high degree of confidence (P 0.001), respectively, at 99.45; 99.41 and 98.46%; the activity of Mg2 +, Na +, K + -, Mg2 + - and Na +, K + -ATPases of the longest back muscle of the valuchs, respectively, by 81.09%; 85.16 and 83.21%. The correlation analysis carried out by the authors proved the effect on the ATPase activity of the erythrocyte membrane and the longest back muscle age; moreover, in the case of erythrocytes, the correlation is negative, in the case of muscle tissue, it is positive. No significant influence of animal species on the activity of Mg2 +, Na +, K + -, Mg2 + - and Na +, K + -ATPases of the erythrocyte membrane and sheep muscle was not found.
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