The two original S. cerevisiae yeast strains were isolated from two different regions in Catalonia, Spain. L76 from a Parellada grape sample from “Pontons”, and L78 from a Cabernet Sauvignon grape sample from “Conca de Barberà”. They had been selected for industrial use on the basis of fermentation power, fermentation kinetics, and technological properties. Yeast strains were kept at 80 C in 20% glycerol. Pre-cultures used for the inoculation of fermentation experiments were grown on YPD (2% glucose, 1% yeast extract, 2% peptone) for 48 h at 28 C and 150 rpm.