Fruit growing
and viticulture of South Russia
Ageeva Natalia
Articles in journal: (total 67)
The main reason for aggravation of fruit wines commodity is the formation of a biopolymer complex with the participation of high-molecular compounds pectic substances, cellulose, hemicellulose, as well as proteins and phenolic substances. The highest concentration of polysaccharides sum, including the pectic substances, was found in the wine materials from apples of Renet Simirenko, and their smallest amount from Florina apples. With the higher content of catechins and anthocyanins, the wine materials were from the varieties of Jonathan and Idared. As a result of the research carried out it was found that the concentration and composition of the biopolymer complex in apple juices depend on varietal characteristics of apples. The highest content of complex compounds was found in the juice from the apple varieties of Idared, Renet Simirenko and Florina. The highest amount of polysaccharides is found in the juices from apples of the Korea, and the highest content of pectin substances is found in the juice from Renet Simirenko and Interpreis apples. It should be noted that the total concentration of biopolymers in the fresh and fermented apple juice had similar values, but their composition was significantly different. It was found that during the fermentation of juices from all studied apple varieties, the proportion of phenolic compounds and, especially, polysaccharides decreased in the complex of biopolymers, but at the same time, the share of protein increased due to its secretion from the yeast cell to the fermented cider material. The obtained experimental data indicate the complexity of the biopolymer complex composition of fruit (apple) wines and the need to take into account both the concentration of biopolymers and their composition in the technological measures development for the prevention and elimination of colloidal dimness in the finished products.
Fruit using in winemaking at sufficiently high concentrations contain biopolymers of different nature, that is difficult for clarification and filterability, provokes occurrence of colloidal haze of wines. The use of enzymatic catalysis considerably reduces the concentration of biopolymers. Enzyme preparations have a different activity, that is confirmed by the results of research of qualitative and quantitative composition of amino acids, and ultimately by composition and concentration of higher alcohols, aldehydes, acetals, simple and high-boiling esters
The data about physical and chemical indicators of champagne wine materials from different grapes varieties grown in the AF "Milstrim Chernomorskie Wines" of Temryuk region are presented in the article
Malic acid plays an important role in the addition of the taste and aroma of grape wines. Its high concentrations lead to the appearance of herbaceous tones and tones of "green acidity", sharpness and softening of taste. To reduce the concentration of malic acid it used the different methods of acid acidification. The work provides data on the effect of the combined acidization method the concentration of organic acids, potassium cations and calcium. The combined method involves reducing the concentration of wine acid with chemical reagents followed by biological acid-acidization with different strains of bacteria of apple (malolactic) fermentation. It has been established that chemical reagents help to reduce the concentration of organic acids mainly due to wine acid. At the same time, neo-antiticide and malicide were the most effective. The ensuring of wine materials with potassium and calcium cations is shown in the process of chemical acid reducing. Analysis of experimental data indicates the slow flow of the process of biological decline of apple acid in the wine materials. At the same time, more active acid-lowering took place in white wine in comparison with red wine. Among the bacteria in terms of the decrease rate in the concentration of apple acid in the white wine material stood out the strains of Vitilactic and Inobacter, which reduced the concentration of malic acid to 1 g/dm3 . The joint use of chemical and biological acid acidization helps to accelerate the reduction of the malic acid concentration in both white and red table wine material`s due to the greater accumulation of biomass of malic-milk fermentation bacteria. There was an improvement in the organoleptic properties of wine materials, and the absence of their enrichment with potassium and calcium cations.
Experimental data on the reological (viscosity-plasticity) characteristics of yeast and adhesive precipitation of wine production are presented. Their knowledge is necessary for calculating the technological equipment when designing the recycling lines. Yeast sediments obtained in the production of white and red grapes by different technologies were used as objects of the study. The effective viscosity of yeast and adhesive precipitation was determined by the Reotest-2 rotary viscosimeter with a cylindrical measuring device. Comparing the amount of plastic viscosity of yeast sediments of white wine materials of Chardonnay and Sauvignon blanc, produced using the same race of yeast, it can be noted its greater importance in Sauvignon blanc, which is associated with the accumulation of more extractive components. The greatest importance of plastic viscosity among red wines is revealed in the sediments of the Krasnostop AZOS during the pulp fermentation. Plastic viscosity of sediments precipitation was caused by the grape variety and the type of sorbent used to process wine. It was established that bentonite sediments had a large amount of plastic viscosity in comparison with gelatin sediment. The joint use of gelatin and bentonite to process wine have led to slight increase in the plastic viscosity of adhesive sediment in comparison with bentonite. When processing the wine materials, especially red ones, with polyvinylpyrrolidone together with bentonite suspension, the more dense sediments was obtained, the plastic viscosity of which had the highest values. The effect of grape variety and wine production technology the amount of plastic viscosity of adhesive sediments has been proved: with the increase in the concentration of high-molecular substances (colloids) in processed wine materials, the plastic viscosity increases.