Wine by-products: phenolic characterization and antioxidant activity evaluation of grapes and grape pomaces from six different french grape varieties

Isabelle Ky (1) , Bénédicte Lorrain (1) , Natallia Kolbas (1) , Alan Crozier (2) , Pierre Louis Teissedre (1)

1 OENO - Unité de Recherche Oenologie [Villenave d'Ornon]
2 University of Glasgow

Grenache, Syrah, Carignan Noir, Mourvedre, Counoise and Alicante Bouchet grape seeds and skins, harvested in 2009 and 2010 in the Rhone valley area of France, and their respective pomaces remaining after vinification, were analyzed for their phenolic composition and antioxidant activity. The polyphenol content was quantified by HPLC and the Folin-Ciocalteu assay. The antioxidant potential was measured with four different assays: ORAC, FRAP, ABTS and DPPH. Seeds contained higher amounts of total polyphenols, up to 44.5 mg of gallic acid equivalent [GAE]/g dry weight in Alicante pomace, than skin extracts. The maximum total phenolic in skins was 31.6 mg GAE/g dry weight detected in 2010 Alicante pomace. Seeds also had the highest antioxidant capacity. HPLC analysis revealed that, despite the vinification process, pomaces still contained an appreciable amount of proanthocyanidins as well as several anthocyanin glycosides. Alicante and Syrah proved to be the varieties of most interest in terms of their potential development for nutraceutical purposes.

Mots clés: grape varieties; grape pomaces; grape by-products; phenolic compounds; proanthocyanidins; anthocyanins; antioxidant activity

Domaines: Ingénierie des aliments; Génie des procédés

Isabelle Ky, Bénédicte Lorrain, Natallia Kolbas, Alan Crozier, Pierre Louis Teissedre. Wine by-products: phenolic characterization and antioxidant activity evaluation of grapes and grape pomaces from six different french grape varieties. Molecules, 2014, 19 (1), pp.482-506. ⟨10.3390/molecules19010482⟩. ⟨hal-02638989⟩