Much has been written about the health promoting properties of E-resveratrol and other related stilbenoids. In plants, these are part of a complex defence mechanism, acting as phytoalexins, playing an important role in the response to biotic and abiotic stress in grapevines. Health benefits of E-resveratrol were used as an argument to promote moderated wine consumption. However, wine contains only between 0.4 and 8.1 mg/L of E-resveratrol. To increase these levels, grape vines were submitted to different growing conditions and grapes have been irradiated with UV- C light. These treatments increased the stilbenoid levels, however they still are much lower than those found in grape canes obtained after pruning of the vineyard. In canes, concentrations can reach up to 5.959 mg/kg dry matter of E-resveratrol and 7.035 mg/kg of total stilbenes in Vitis vinifera canes, stored during several months after pruning. This procedure enhances the stilbenoid levels in canes up to fivefold, based on dry matter [1, 2]. The mechanism that causes this increase is still unknown, but undoubtedly it has a significant incidence on the potential of grape canes as a source of stilbenoids. The grape variety also is relevant, highest levels were found in canes of Gew�rztraminer, followed by Pinot noir, although some other varieties showed promising levels. Summarizing, cane management after pruning and grape variety have a great influence on the potential use of canes as a source of stilbenoids; concentrations also depend on biological variability between different vineyards and collection years. Water stress does not produce a significant increase of stilbenoid levels.Acknowledgements: FONDECYT (Chile), Grant 1110767, Insertion in Academia Grant 79112036, CONICYT, CONICYT Doctoral Fellowship and FONDEF-CONICYT Grant D10I1104References(1) Vergara et al, J. Agric. Food Chem. 60, 929�933(2012)(2) Gorena et al, Food Chem. 155, 256�263 (2014)

Evaluation of the potential of grape canes as a source of bioactive stilbenoids

248th National Meeting (2014)

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