4. Conclusion
Different grape parts, peel, pulp, and seeds, Vitis vinifera (Brazil
and Benitaka) and Vitis labrusca (Niagara and Isabel) showed
proximate composition differently. Total lipids, protein, and ash
contents were higher in seeds, followed by the peel and pulp. The
seeds of grapes showed high oil content, polyunsaturated fatty acids,
oleic acid and the highest levels of trans-resveratrol, phenolic
compounds and antioxidant capacity, and the grapes' peel showed
intermediate composition between seed and pulp, however, the
composition of the pulp was lower than the peel or was absent. The
polar fractions, ethyl acetate and methanol, especially this latest, were
effective in the extractions of phenolic components. This study
demonstrated that these grapes are potential source of nutrients,
essential fatty acids and phenolics. The different parts or extracts can
be used as antioxidant sources by the industry, utilized as nutraceutical,
besides providing important information to winemaking
industry. Qualitative and quantitative studies, in the composition of
phenolics of these varieties are highly warranted.