Object of research: frozen fruits of black currant varieties Bilorus Sweet, Minai Shmyrev. Investigated problem: substantiation of the influence of the method, the duration of freezing on changes in the structure of black currant fruits of different degrees of maturity and pomological varieties. The main scientific results: the advantages of fast freezing of black currant fruits in a fast freezing chamber with forced air circulation at a speed of 1.5–2.5 m/s at a temperature of -30 …- 32 °C compared to slow freezing in " Calex " freezers were established at a temperature of -20 …- 22 °C. Rapid freezing forces cooling, freezing and freezing due to a decrease in the temperature of initiation of ice formation, an increase in the rate of heat extraction and an increase in the temperature of freezing. The area of practical use of the research results: food industry enterprises specializing in the freezing of plant products. An innovative technological product: the technology of freezing black currant fruits, which allows to extend the period of consumption of high-quality fruits with a preserved structure. Scope of application of an innovative technological product: nutrition of the population.
Уманський національний університет садівництва Статтю присвячено вивченню біологічно цінних речовин плодів чорної смородини, а саме-вмісту аскорбінової кислоти, поліфенольних речовин, амінокислот. Досліджено їх збереженість під час приготування продуктів комплексної та безвідходної переробки плодів чорної смородини та процеси їх перетворення під впливом термічної обробки.
The process of ice formation in the pericarp of black currant depends on the pomological variety, the degree of ripeness of the fruit, and the method of freezing. During the slow and fast freezing of black currant, four ranges of fruit cooling temperatures are distinguished: 1) from the temperature of the fruit to the temperature of initiation of ice formation; 2) from the temperature of the front (initiation) of ice formation to the lowest possible temperature of the fetal mesocarp; 3) from the lowest possible temperature of the mesocarp to the lowest temperature of the fetal endocarp; 4) from the lowest possible endocarp temperature to fetal freezing temperature. Fast freezing boosts cooling, freezing and freezing from 37 min. (slow) up to 5.6 min. due to a halving of the temperature of initiation of ice formation, an increase of 1.3 times in the rate of heat extraction and an increase in the freezing temperature from –22...–24 °С (slow) to –20.8 °С. It is scientifically substantiated that the temperatures of freezing fruits significantly change the general existing recommendations (not higher than –18 °С) regarding the storage conditions of black currant fruits: with quick freezing, not higher than –21 °С, with slow freezing, not higher than –24 °С. The formation of the properties of black currant occurs during the growing season under various agro-climatic conditions and affects the parameters of ice formation indicators. The marketable condition, quality and organoleptic characteristics of black currant fruits depend on the method of freezing. The advantages of fast freezing of black currant fruits in a quick-freezing chamber with forced air circulation at a speed of 1.5–2.5 m/s at a temperature of –30...–32 °С in comparison with slow freezing in freezers at a temperature of –20 have been established. ..– 22 °С.
The paper presents the results of experimental research on the peculiarities of the chemical composition of kohlrabi varieties 'Azur', 'Videnska Synia', 'Videnska Bila' and 'Hihant' cultivated in field conditions in the Forest Steppe of Ukraine. The goal of the research was to track changes in the biochemical composition of kohlrabi under the effect of varietal factor. The experiment was carried out in the years 2018−2021. It was found that the vegetation period of the variety 'Hihant' is 145 days, while the vegetation period of varieties 'Azur', 'Videnska Synia' and 'Videnska Bila' ranges between 60 and 80 days. As a result of the longer vegetation period, 'Hihant' overcomes other varieties under study by the content of water (88.7%) and dietary fiber (2.1 g/kg). Kohlrabi variety 'Videnska Synia' is the most suitable for dietary nutrition, since it has a higher content of vitamins A, B 1 , B 9 , B 4 , C, B 3 , and essential amino acids, such as arginine, valine, histidine, isoleucine, leucine, lysine and phenylalanine, compared to other varieties. The content of linoleic, linolenic and palmitic acids is also the highest in 'Videnska Synia'. However, the content of vitamin B 6 is the highest in 'Hihant'.
Black currant is a multivitamin crop with high dietary and medicinal properties and is a source of exceptionally valuable raw materials for juice production. The essence of the problem of this paper is the scientific substantiation of ways and methods of efficient juice extraction while preserving the natural chemical composition and biologically active substances. The purpose of this study is to compare the methods of heat treatment of black currant fruits to increase juice production. Evaluation of the efficiency of juice output from black currant fruits should be carried out differentially according to the level of desirability of Harrington: exceptionally good – more than 55%, good – 48-55%, satisfactory – 40-48%, unsatisfactory – 35-40%, very unsatisfactory – less than 35%. The fruits of black currant, as a rule, yield 18-24% of the juice, which is devoid of its inherent colouring. Heat treatment of raw materials increases the juice yield by 1.5-2.5 times compared to grinding, and at the same time, at 50-55°C, the cells die within 5 minutes. Good juice yield indicators upon pressing the pomace of crushed fruits (49-55%), satisfactory – upon heating whole fruits with the addition of 15% water (38-45%), as well as blanching fruits in water with a temperature of 95-100°C (42-45%). Juice extraction by blanching fruits and pomace in their own juice is inefficient (33-36%). In terms of chemical composition, freshly pressed juices, regardless of the method of processing raw materials, are close to fresh fruits. Heat treatment of raw materials does not adversely affect the taste and aroma of juices. The content of ascorbic acid in juices (142-225 mg/100 g) depends on the variety of fruits and weather conditions of the year. Its preservation in freshly pressed juices during heat treatment is 95-97%, including blanching – 83-90%. In juices with sugar, its content is 1.7 times lower, but the preservation is 98-99%. During the storage of juices with sugar, the preservation of ascorbic acid decreases during the first three months – by 1.5-2%, in 6 months – by 5.5-7%, in 9 months – by 10-13%, in 12 months – by 16-19% or 7-10 times. Factors for stabilising ascorbic acid in juices are sugar, hot bottling, and short-term heating at elevated temperatures
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