Constitutive stilbene contents of grapevine cluster stems as potential source of resveratrol in wine
DOI:
https://doi.org/10.5073/vitis.1997.36.115-118Keywords:
grapevine, stems, trans-resveratrol, cis-resveratrol, ε-viniferinAbstract
Ripe clusters of 8 Vitis vinifera L. varieties (Cabernet franc, Gewürztraminer, Marzemino, Merlot, Moscato, Pinot gris, Sauvignon, Tocai friulano) were analysed to determine the constitutional levels of trans- and cis-resveratrol, ε-viniferin and pterostilbene. Grape stems were extracted by an hydroalcoholic solution, in order to simulate the resveratrol extraction from stems that might occur during alcoholic fermentation, due to the presence of little pieces of stems in the fermenting must. The average stem concentrations of constitutive trans-, cis-resveratrol and ε-viniferin were 142, 0.30, and 70 mu g.g-1 FW, respectively; pterostilbene was not found. Varieties differed significantly in their stilbene content. The percentage of trans-resveratrol extracted from the stems by a hydroalcoholic solution varied from 2.5 % (Gewürztraminer) to 32.9 % (Marzemino), the contribution of the stems to the trans-resveratrol concentration of the hydroalcoholic solution being, on the average, 34 mu g.l-1.Downloads
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