Characterization of seed and skin polyphenolic extracts of two red grape cultivars grown in Croatia and their sensory perception in a wine model medium

•Phenolic and sensory characterization of Plavac mali and Babić grapes.•Skins proanthocyanidin composition the most important discriminatory variable.•Positive correlation between polymer size, galloylation and astringency in seeds.•Negative correlation between epigallocatechin content and bitterness in skins.