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Polyphenols composition of Dalmatian grapevine varieties grown under continental climate

Much of the data acquired during the last few decades suggest that climate changes are taking place. These climate changes, in particular increasing temperatures, have important consequences on viticulture and different approaches have been proposed for adaptation. Shifting of grape varieties growth from their traditional sites towards a cooler climate is one of them. In Croatia, there are 125 autochthonous grape varieties including 38 red ones. The great majority of red grape varieties are native to the Costal Croatia region, belonging to the wine growing zone CII and mediterranean climate. The aim of this study was to investigate the content and composition of individual polyphenolic compounds of 11 Dalmatian varieties which were grown in Zone B with continental climate. Since Merlot is used in continental climate for production of high quality red wines, it was used for comparison. Out of 11 cultivars included in this research, highest skin content (based on dry weight) of anthocyanins was determined for ‘Nincusa (63068 mg/kg)’, ‘Trnjak’ (29716 mg/kg), ‘Dobricic’ (24464 mg/kg), ‘Ljutun’ (23695 mg/kg). The content of anthocyanins of ‘Plavac mali’, (cv. with very late ripening) was lower (18740 mg/kg) but almost the same as that of ‘Merlot’ (19334 mg/kg). A similar trend was observed in the case of flavonol-glycosides. The content of flavan-3-ols determined in varieties ‘Nincusa’ and ‘Rudezusa’ was lower than that observed in ‘Merlot’, while the values obtained for ‘Plavac mali’, ‘Dobricic’ and ‘Ljutun’ were higher than for ‘Merlot’. These results suggest that these varieties, based on the content and composition of polyphenolic compounds, have a potential for usage in continental climate wine production.

anthocyanins, autochthonous Croatian grape varieties, flavonol-glycosides, flavan-3- ols

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