Phenolic characterization of grapevine cultivars from Galicia (Spain) : Brancellao, merenzao and mencìa (Vitis Vinifera L.)

The polyphenolic composition of Brancellao, Merenzao and Mencia grapes from Galicia (northwestern Spain) was studied using spectophotometric and High Performance Liquid Chromatographic (HPLC) methods. The results showed significant differences between these cultivars. The total anthocyanins ranged from 215 mg/ kg berries in Brancellao to 422 mg/ kg berries in Mencia. The three cultivars were characterized by an interesting anthocyanin profile for winemaking with a prevalence of malvidin-3-glucoside. The skins and seeds, both had small amounts of flavonoids. In contrast to Brancellao and Mencia, Merenzao had more flavonoids in the seeds (64%) than in the skins. The most important parameters for differentiating between the cultivars were the peonidin and malvidin derivative forms, and the total amounts of acetyl-glucosides.

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