Effect of toasting on non-volatile and volatile vine-shoots low molecular weight phenolic compounds

Low molecular weight phenolic compounds (LMWPC), including non-volatile and volatile, of Airen and Moscatel vine-shoot cultivars waste submitted to different toasting conditions (light, 180 degrees/15 min; medium, 180 degrees/30 min; high 180 degrees/45 min) were studied in order to exploit them with oenological purposes. The LMWPC differences were mainly due to the toasting times rather than vine-shoot variety. In nonvolatile LMWPC fraction, flavanols and almost all phenolic acids decreased by toasting. The presence of trans-resveratrol has a special relevance at light toasting: 14 times more concentrated in Airen and 6 times in Moscatel vine-shoots, than their respective non-toasted samples. The volatile LMWPC showed a significant increment with toasting, being vanillin the one with the highest difference respect to non-toasted samples at high conditions: more than 15 times in Airen and 11 in Moscatel. Although toasting reduced some LMWPC, particular characteristics of these vine-shoots must be taken into account when considering its future use. (C) 2016 Elsevier Ltd. All rights reserved.