Varietal differences among the flavonoid profiles of white grape cultivars studied by high-performance liquid chromatography.

In order to develop a method that allows to distinguish between white grape cultivars, the flavonoid profiles of 10 white accessions from the "Misión Biológica de Galicia" germplasm collection were studied during years 2003, 2004 and 2005 by high-performance liquid chromatography (HPLC). Twenty-four flavonoids (15 flavonols and 9 dihydroflavonols) were totally or partly identified, and significant differences between the studied flavonoid markers were found. With this method all the cultivars examined could be easily distinguished from each other, and we may conclude that this has been proved to be of great value for white grape cultivar recognition.