Grape skin extracts from pinot noir and pinot gris exhibited significant in vitro antiviral (influenza virus)
activity. Five tea infusions from grape skins (Vitis vinifera var. pinot noir and pinot gris) without any additives
(control pinot noir and control pinot gris) or by adding variable amounts of green tea and hibiscus
were investigated as a means to utilise wine wastes. The antioxidant activities (DPPH scavenging capacity
and superoxide anion radical scavenging capacity), total phenolics, the polyphenolics profile and
objective colour measurements (CIELab) were determined on freeze-dried water extracts of all five tea
infusions, hibiscus and green tea. The colour parameters, L⁄ and a⁄ values, varied widely (P < 0.05) for
all the infusions as a result of having different levels and variety of pigments. The tea infusions exhibited
weak antioxidant activity and the antiviral activity in grape skin appears not related to phenolics
contents.