Effect of post-pruning vine-shoots storage on the evolution of high-value compounds

Vine-shoots post-pruning storage time revealed an important stilbenes accumulation, but there are no studies with other minor metabolites. For this reason, the evolution of non-volatile phenolic and volatile compounds of two vine-shoot cultivars (Airén and Cencibel) after 1, 3 and 6 months of post-pruning storage was studied. Significant differences among cultivars were observed, making a total average content of 2 g/kg in Airén and 1.6 g/kg in Cencibel, being the non-volatile phenolic fraction the most abundant. The highest accumulation was observed after 6 months post-pruning storage. Especially significant was the accumulation of vanillin at 6 months, with a 7% increment observed in Airén cultivar and 35% in Cencibel. Such increment was related to the decrement of ferulic acid content with time. Consequently, the storage of vine-shoots post-pruned have a direct impact on the concentration of several metabolites, not only stilbenes, which suggest an alternative new use of such agricultural wastes.