Characterisation of Mediterranean Grape Pomace Seed and Skin Extracts: Polyphenolic Content and Antioxidant Activity
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Grape pomace seeds and skins from different Mediterranean varieties (Grenache [GRE], Syrah [SYR], Carignan [CAR], Mourvèdre [MOU] and Alicante [ALI]) were extracted using water and water/ethanol 70% in order to develop edible extracts (an aqueous extract [EAQ] and a 70% hydro-alcoholic extract [EA70]) for potential use in nutraceutical or cosmetic formulations. In this study, global content (total polyphenols, total anthocyanins and total tannins), flavan-3-ols and anthocyanins were assessed using HPLC-UV-Fluo-MSn. In addition, extract potential was evaluated by four different assays: Oxygen Radical Absorbance Capacity (ORAC), Ferric Reducing Antioxidant Potential assay (FRAP), Trolox equivalent antioxidant capacity (TEAC) or ABTS assay and 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay. As expected, seed pomace extracts contained higher amounts of polyphenols then skin pomace extracts. Indeed, seeds from Syrah contained a particularly important amount of total polyphenols and tannins in both type of extract (up to 215.84 ± 1.47 mg of gallic acid equivalent [GAE]/g dry weight (DW) and 455.42 ± 1.84 mg/g DW, respectively). These extracts also expressed the highest antioxidant potential with every test. For skins, the maximum total phenolic was found in Alicante EAQ (196.71 ± 0.37 mg GAE/g DW) and in Syrah EA70 (224.92 ± 0.18 mg GAE/g DW). Results obtained in this article constitute a useful tool for the pre-selection of grape pomace seed and skin extracts for nutraceutical purposes.
Draghici-Popa A, Buliga D, Popa I, Tomas S, Stan R, Boscornea A Molecules. 2024; 29(12).
PMID: 38930846 PMC: 11206142. DOI: 10.3390/molecules29122775.
Craciunescu O, Seciu-Grama A, Mihai E, Utoiu E, Negreanu-Pirjol T, Lupu C Int J Mol Sci. 2023; 24(23).
PMID: 38069172 PMC: 10706173. DOI: 10.3390/ijms242316849.
Mosele J, da Costa B, Bobadilla S, Motilva M J Agric Food Chem. 2023; 71(48):18746-18757.
PMID: 37983717 PMC: 10730009. DOI: 10.1021/acs.jafc.3c04660.
Lombardi A, Campo M, Vignolini P, Papalini M, Pizzetti M, Bernini R Molecules. 2023; 28(11).
PMID: 37298850 PMC: 10254516. DOI: 10.3390/molecules28114374.
Chengolova Z, Ivanov Y, Godjevargova T Molecules. 2023; 28(10).
PMID: 37241801 PMC: 10220657. DOI: 10.3390/molecules28104061.