Regarding the effect of non-conventional MAP on the total
polyphenols content of watercress, Silveira et al. (2014) reported
initial contents of 2 g GAE kg1 extract (obtained after homogenizing
1 g of frozen watercress with 3 mL of methanol/water (4:1, v/
v)), where the lowest value corresponded to the samples packaged
in N2-enriched atmospheres.