Effect of the modifier (Graciano vs. Cabernet Sauvignon) on blends of Tempranillo wine during ageing in the bottle. I. Anthocyanins, pyranoanthocyanins and non-anthocyanin phenolics

The effect of Graciano (GRA) (Spanish valuable variety of limited production) vs. Cabernet Sauvignon (CS) (world wide known French variety) wines on the anthocyanin, pyranoanthocyanin and non-anthocyanin phenolic composition of wines from Tempranillo (TEM-base wine) (largely cultivated Spanish variety) was studied in wine blends prepared with 25% and 10% (v/v) of each modifier after 4, 6, 9, 16.5 and 23 months of ageing in the bottle. Blending mainly resulted in a higher concentration of peonidin anthocyanins for the TEM-GRA blends, of acetyl-glucoside anthocyanins and anthocyanin-pyruvic acid adducts for the TEM-CS blends, and of flavanols for the blends with both GRA and CS varieties, giving rise to wines with a more balanced anthocyanin/flavanol ratio. Blending also enhanced the changes expected to occur in the phenolic compounds during ageing in the bottle. Particularly, anthocyanins and flavanols in the blends disappeared faster than in the base wine, and this was more pronounced for the 75:25 than for the 90:10 blends. These effects were similar for both modifier wines, independent of the specific changes produced in the anthocyanin profile of the base wine, but coincided with the similar optimization of the anthocyanin/flavanol ratio provided by both Graciano and Cabernet Sauvignon wines.