PHYSICOCHEMICAL EVALUATION OF THE GRAPE AND WINE OF THE BLATINA, TRNJAK AND VRANAC IN DIFFERENT VINTAGES

Typicality and style of wine are closely related to the varietal character of grapes, ecological properties of the locality, and the specificities of the winemaking process. For this reason, autochthonous and indigenous grape varieties are increasingly the subject of many studies. To protect their uniqueness, in the region of Hercegovina (Bosnia and Herzegovina), indigenous grape varieties are part of the current grape and wine production. Therefore, the subject of a two-year study (2018-2019) were indigenous wine varieties: Blatina, Trnjak, and Vranac. Variations in the values of the analyzed parameters were a consequence of the significant and/or highly significant influence of the variety and year. Blatina stood out from other varieties with the highest average cluster weight (364.90 g) and the highest wine color intensity (10.71). Trnjak had the highest total anthocyanin content in the grape skin and total polyphenol content in the grape seeds (1090.198 mg/kg grapes; 1755.195 mg/kg grapes), while Vranac had the highest polyphenol content in the grape skin (1823.961 mg/kg grapes), the highest TSS level (21.55% Brix), and consequently, the highest alcohol content in the wine (12.07% v/v).