Levels of cis- and trans-resveratrol and their glucosides in white and rose Vitis vinifera wines from Spain

The resveratrol monomers (trans-piceid, cis-piceid, trans-resveratrol, and cis-resveratrol) have been previously identified and quantified in red wines. Here, the levels of these compounds in Spanish white and rose wines are described. For white wines, a concentration step was needed to quantify the four resveratrol isomers. The recovery and reproducibility of this procedure were very good. These white wines had levels between 0.051 and 1.801 mg/L. Rose wines had an average level of 2.15 mg/L, in between those of red and white wines.