Analysis of the carbon-acid and phenolic complexes of grapes of the crimean red autochthonous varieties
The paper reports on the study findings on carbohydrate-acid and phenolic complexes of Crimean autochthonous red grapevine varieties: ‘Khersonosesskij', ‘Solnechnaya dolina 58', ‘Krona', ‘Kutlakskij chyornyj', ‘Kokurdes chyornyj', from the western foothill-seaside region of Crimea. The study revealed that at sugar accumulation of 186-207 g/dm<sup>3</sup>, titrated acids content in the grapes was below 6.5 g/dm<sup>3</sup>. The technological stock of phenolic substances in the grapes of ‘Solnechnaya dolina 58' and ‘Krona' cultivars was within the range of the optimal values (≥ 2000 mg/dm<sup>3</sup>) for the production of red table wines; and was at acceptable levels in the grapes of the other varieties (≥ 1000 mg/dm<sup>3</sup>). The technological stock of the colouring components in the grapes made 155-430 mg/dm<sup>3</sup>. By their physic-chemical and organoleptic characteristics, the produced wine materials were consistent with GOST 32030, and demonstrated pronounced varietal peculiarities in the aroma and taste. The findings suggest that it is possible to use grapes of the studied varieties grown in the specified region of Crimea for the production of table wine materials. Certain benchmarks were outlined for the optimization of the varietal technologies.