Abstract
The aim of this research was to study the recovery of phenolic compounds from grape seeds, by-products from winemaking industries, using ethanolic solid–liquid extraction. For such a purpose, the combined effects of the extraction time (9, 19 and 29 h) and the solid–liquid ratio (0.10, 0.20 and 0.30 gdw mL−1), were investigated (where dw = dry waste). Results demonstrated that Pinot Noir seeds had high levels of both total polyphenols (73.66 mgGallic Acid Equivalent gdw−1) and flavonoids (30.90 mgCatechin Equivalent gdw−1), being the optimum extraction time 19 h approximately. The main phenolic compounds analysed with high performance liquid chromatography were catechin and quercetin with a maximum extraction yield obtained at 29 h (362.23 and 339.35 mg/100 gdw, respectively). Concentration of the polyphenols and their antiradical powers are demonstrated to have a significant linear correlation.
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