Fruit growing
and viticulture of South Russia

Annotation

The grape industry is among the leading in the agro-industrial complex of Dagestan. In 2021, 219 thousand tons of grapes were harvested in the republic. About 70 % of the yield is raw materials for the production of alcoholic beverages. Autochthonous varieties are often used to produce high-quality wines along with introduced grape varieties. The chemical composition of wines is an important indicator of their taste, aroma and health benefits. The presence of amino acids, especially essential ones, in natural wines indicates their functional orientation. The purpose of the research is to determine the qualitative composition and quantitative content of amino acids in experimental samples of wine materials for dry wines made from the technical varieties of the grapes Gimra Novaya, Pervenets Magaracha and Fioletta, grown on the plain in the southern viticulture zone of Dagestan. The presence of amino acids was determined in four prototypes of red and pink wine materials using the capillary electrophoresis system "KAPYeL-105", OOO NPF �LUMEX�. The method of measuring the mass concentration of proteinogenic amino acids (MVI M 04-38-2004, St. Petersburg, 2004) was used. From 7 to 11 amino acids are identified, among which partially replaceable is arginine; conditionally indispensable � tyrosine and essential � valine, leucine, methionine, tryptophan, phenylalanine. A significant amount of the substituted amino acid proline was found in red wine material from the Gimra Novaya variety � 145.3 mg/dm3 . Also, a significant amount of partially replaceable arginine was found in pink wine material from the Pervenets Magaracha and Fioletta varieties � 3.9 mg/dm3 . The composition and concentrations of representatives of amino acid pools identified in new wine materials from grapes of the local breeding varieties Gimra Novaya and Fioletta, as well as the introduced variety of the Pervenets Magaracha, grown in terroir located on the Caspian plain of southern Dagestan, indicate that these wines are functional products. The use in optimal doses of table dry wines formed from these wine materials will be useful for normalizing the activities of various systems of the human body.

Annotation

The production of competitive geographical denomination wines, that can solve import substitution issues and improve the quality of wines, should become one of the promising direction for the development of Daghestan wine-making. In this regard, there is a need to produce the high-quality wines from grape varieties with high biological value The production of wines raising the prestige of the Republic, fixed under the term � wines of protected geographical names, must also be supported, as well as the use of local grape varieties as well as raw materials for their production, along with introduced ones. It is made a comparative study of experimental samples of wine materials, obtained from grapes of local technical the Gimra Novaya, Fioletta varieties, and introduced variety of Pervenets Magaracha, grown in the Southern plain zone of Daghestan. Physical and chemical parameters were determined by standard methods used in anoxemia. The study of phenolic substances and vitamins was carried out using capillary electrophoresis on the "Kapel 104T" device. It was found that the wine material from the Gimra Novaya grape variety significantly exceeds other experimental samples in the amount of phenolic substanced (3361 mg/dm3 ), content of ascorbic (100.13 mg/dm3 ), orotic (27.45 mg/dm3 ), caffeic (29.90 mg/dm3 ), gallic acids (38.80 mg/dm3 ) and the total amount of biologically active substances (226.89 mg/dm3 ). The results of research carried out have revealed that the local grape varieties of Gimra Novaya and Fioletta have some advantages in terms of the content of biologically active substances, compared to the introduced variety of Pervenets Magaracha and can be used for the preparation of high-quality extraordinary red and pink blended wines.

Annotation

Research aimed at improving the biotechnology of red table wines production, taking into account the characteristics of raw materials, used yeast races, region of origin, climate and fermentation conditions, is relevant. The object of research was wines from Cabernet-Sauvignon grapes of the 2019 harvest, grown on chestnut, calcareous soils of medium loamy texture of the terroir of the Mugarty village near the Mugartychay river (Kamyshchay river basin) in the Derbent region of the Daghestan Republic, and obtained at OJSC "Derbent Sparkling Wine Factory". The strains S. cerevisiae Y-4270 and S. cerevisiae D-19 were used for fermentation. The qualitative and quantitative composition of volatile substances in the wines under study was determined by gas-liquid chromatography. It is shown that "Kara-Koisu" wine obtained using the Y-4270 strain, was more aromatic due to the greater accumulation of esters and acetate. The content of ethyl acetate (by 2.4 times), ethyl lactate (on 9.9 %), and ethyl laurate, which give roundness to fruit or floral aromas, is on 29.7 % higher in the test sample (with the exception of ethyl capronate). Aliphatic alcohols formed an important basis for the aroma of wine, the total amount of which was 433.84 mg / dm3 , which is on 39.7 % higher than that in the control. Isoamyl (62.3 %), isobutyl (42.5 %), 1-propanol (31.2%), methanol (32.5 %) prevailed in the tested wines. The aromatic alcohols are twice as high in phenylethanol, which adds floral nuances to the wine. New data indicated the role of the biochemically active S. cerevisiae strain VKPM Y-4270 in the creation of dry red wines.

Annotation

The grape-growing industry is a priority in the agro-industrial complex of Daghestan. At present, when special attention is paid to creating conditions for the production of "protected geographical indication" wines, it is necessary to expand the research of grape raw materials used for their production. In this regard, in the Republic of Daghestan the study of nutritional and technological properties of new autochthonous grape varieties, along with introduced ones is actual, to recommend the production of wines from them that can increase the prestige of local wine products. It is determined that the qualitative composition and quantitative content of pools of aroma-producing substances in red and rose wine materials made from grapes of technical local varieties Gimra Novaya and Fioletta, as well as the Pervenets Magaracha (harvest 2019), grown in the conditions of the Derbent district of the Republic of Daghestan on the plantation of the Dagestan Selecting Testing Station of Viticulture and Horticulture � branch of the Federal State Budget Scientific Institution �North Caucasian Federal Scientific Center of Horticulture, Viticulture, Winemaking�. Aroma-producing substances were determined on a gas chromatograph �Crystal 2000M� (RF). A significant amount of carbonyl compounds (325.48 mg/dm3 ) and esters (252.94 mg/dm3 ) was found in the rose wine material produced from the Pervenets Magaracha and Fioletta varieties. The highest total number of higher alcohols (1871.37 mg/dm3 ) and aromatic components (2588.68 mg/dm3 ) was found in the wine material from the red variety Gimra Novaya. A high concentration of 2,3 butylene glycol and a higher alcohol, isoamyl alcohol, was noted. The total mass concentration of volatile acids in the studied experimental samples of wine materials was 439.56-781.28 mg/dm3 . It is determined that the natural conditions of the southern zone of Daghestan are favourable for the cultivation of grapes of autochthonous varieties Gimra Novaya, Fioletta and introduced variety Pervenets Magaracha. Using them as raw materials for obtaining high-quality wine materials will allow you to form in their bouquet the tones of smoky prunes, hints of the taste of pomegranate and blackthorn fruits.

Annotation

The results of studying the qualitative composition and quantitative content of amino acids in red table wines made from Cabernet-Sauvignon grape variety using S. cerevisiae Y-4270 and Derbentskaya-19 strains are presented. It was found that the concentration of amino acids in wine samples was influenced by the individual characteristics of the yeast strains applicated in the preparation process, and certain climatic parameters in the region, which are different in 2019 and 2020 � the amount of annual precipitation and the insolation intensity. In all variants of wine, there was a significant variation in both the sum and the concentrations of individual amino acids. The highest content of free amino acids was found in the 2020 yield sample prepared using the D-19 strain. It was found that proline prevails in all variants; as a percentage of the total amount of amino acids, its content in all variants is approximately the same, however, in mg/dm3 , these indicators are several times higher in the samples of 2020. In the wine obtained using the new strain of S. cerevisiae Y-4270, the concentration of proline is 2 times less than in the second variant (S. cerevisiae D-19), which affected its organoleptic assessment. As a result of a comparative analysis, it was shown that the total content of essential amino acids in the studied wines did not exceed the level of 77.31 mg/dm3 . Formed during fermentation mainly from amino acids, substances that enhance the fullness of the aroma, influenced the quality of wine materials. Obviously, the optimal concentration of free amino acids in the samples studied by us contributed to the formation of high organoleptic characteristics of dry red wines.