Keywords
HPLC;
phenolic complex;
pH;
monophenolmonooxygenase activity;
quality of wine products.
Abstract
The development trend of authentic wine sector, as well as climate change, increases the importance for winemaking of Crimean autochthonous grape varieties. The purpose of the work: to assess the effect of agroecological conditions of vineyards of the South Coastal Zone of Crimea on carbohydrate-acid and phenolic complexes, oxidase activity (MPhMO), quality of crops and wines from ‘Kokur Belyi’ variety. Research methods: geoinformation and mathematical modeling, HPLC, methods adopted in enochemistry,
statistical analysis. It was found that heat resources of vineyards were increasing (Wilks L. = 0.004 with <0.00001) in the series vil. Privetnoye → vil. Solnechnaya Dolina → vil. Morskoye. An increase in heat provision of the territories was accompanied ( <0.05) by the accumulation of sugars in berries, phenolic acids, flavonols, flavan-3-ols and procyanidins in grape seeds, an increase in pH and MPhMO of the must, on one hand; and on the other hand, it contributed to the oxidative polymerization of phenolic components
during grape ripening and its processing, leading to a decrease in the content of mono- and dimeric components in the skin and pulp of grapes, flavan-3-ols - in wines. In wines from the vineyard of vil. Morskoye, the lowest concentration (178.2±19.9 mg/dm3) of monomeric and dimeric phenolic components was determined; concentration of phenolic acids in wines from vil. Solnechnaya Dolina, and concentration of flavan-3-ols in wines from vil. Privetnoye exceeded the values in other samples by 2.3 and 2.9 times,
respectively. All samples of wines had varietal aroma and flavor: wines from vil. Solnechnaya Dolina were distinguished by a dense structure, dark straw color; wines from vil. Privetnoye - by a lighter flavor and light straw color. Conclusion: depending on the heat provision of the territories, dry white wines of different styles can be obtained from ‘Kokur Belyi’ grapes.