After 5 months of storage, the pressurized wines presented around 10% less phenolic acids content when compared with the unpressurised wine. This behavior was mainly due to the lower content of gallic and caftaric acids, themost dominant phenolic acids quantified, in the pressurized wines when compared with the unpressurized wine, since the 500 MPa and 600 MPa wines presented 11% and 22% less of gallic acid, and 8% and 6% less of caftaric acid, respectively. In relation to the flavonol content, the 500MPa and 600MPa wines presented 24% lower content of myricetin and 13% and 10% lower content of quercetin, respectively, when compared with the unpressurized wine. The kaempferol content was 19% lower in the wine pressurized at 500 MPa when compared with the unpressurized wine, while for the
600 MPa wine the content was not significantly different (p b 0.05). These results show that phenolic acids and flavonols were also affected by HHP treatments, leading to wines with possible lower bioactivity.
The decrease of these phenolic compoundsmay be relatedwith the generation of high-reactive radicals during pressurization, enhancement of chemical oxidation, and polymerization of phenolic compounds during storage