Bioactive compounds and total antioxidant capacity of cane residues from different grape varieties

BOTTINI, RUBÉN; ANTONIOLLI, ANDREA; FERREYRA, SUSANA G; FONTANA, ARIEL; BOTTINI, RUBÉN; ANTONIOLLI, ANDREA; FERREYRA, SUSANA G; FONTANA, ARIEL

JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE

JOHN WILEY & SONS LTD

Año: 2020 vol. 100 p. 376 - 383

0022-5142

BACKGROUND: Every year, the viticulture activity generates considerable amounts of underused lignocellulosic residues as grape cane, which are generally composted or burned despite their potential value as a source of bioactive compounds. Determination of their phytochemical composition and total antioxidant capacity (TAC) may be a useful way of exploiting different high-added value applications. RESULTS: Twenty-one phenolic compounds (PC) and two carotenoids (Car) were quantified by high performance-liquid chromatography-diode array detection in eight grape varieties from different locations in Mendoza, Argentina. The maximum concentrations corresponded to the stilbene ϵ-viniferin [10 552 μg g−1 dry weight (DW)], followed by the flavanols (+)-catechin (3718 μg g−1 DW) and (−)-epicatechin (2486 μg g−1 DW). In addition, lutein and β-carotene were quantified at levels ranging between 350 and 2400 ng g−1 DW. The TAC of the extracts was assessed by oxygen radical absorbance capacity, 2,20-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid and 1,1-diphenyl-2-picrylhydrazyl assays, with a good correlation between TAC and total PC for each sample (r ≥ 0.82). CONCLUSION: Samples of cv. Malbec, the most representative variety of Argentina´s winemaking industry, presented high contents of PC, particularly ϵ-viniferin, (+)-catechin and (−)-epicatechin. Quercetin-3-galactoside, OH-tyrosol and Car were reported for the first time in grape canes of the eight varieties. The results add to the existing knowledge related to this inexpensive source of high-value bioactive compounds, which could be used as functional ingredients. © 2019 Society of Chemical Industry.