Phenolic profile in varietal white wines made in the Canary Islands

In the Canary Islands there are some lesser-known varieties of white grapes. The aim of this study is to examine the differences in phenolic compounds and colour coordinates between three varietal white wines, Listain blanco, Verdello and Gual, cultivated in a very special region due to its location and its low irrigation. Using a HPLC method, we have measured 19 compounds of different phenolic groups. The wines of this study presented high values of these compounds. The Gual variety had the highest significant values of the cis and trans-resveratrol, trans-piceid and total resveratrol content with an average of 3.94 mg/L. The ratio of trans-coutaric acid/trans-caftaric acid concentration allowed the differentiation also of Gual variety. Furthermore, caftaric acid has been shown to be a chemotaxonomic parameter for white wines.