Lalvin ICV-D21®: The ‘terroir’ yeast Lalvin ICV-D21 was isolated in 1999 from Pic Saint Loup Languedoc “terroir” during a special regional program run by the Institut Coopératif du Vin (ICV)’s Natural Micro-Flora Observatory and Conservatory. Lalvin ICV-D21 was selected for fermenting red wines with stable color, intense fore-mouth, mid-palate tannin structure, and fresh aftertaste.
Unlike most wine yeasts, Lalvin ICV-D21 contributes both higher acidity perception and positive polyphenol reactive polysaccharides. Strong interactions of the polysaccharides with the floral and fruity volatile compounds (β-ionone, ethyl hexanoate) contribute to a more stable aromatic profile in the mouth. These attributes avoid the development of cooked jam and burning-alcohol sensations in highly mature and concentrated Cabernet Sauvignon, Merlot and Syrah. During fermentation, Lalvin ICV-D21 produces very few sulfides and it is also noted for its good fermentation performance even under high temperature and low nutrient conditions. It allows for the expression of fruit from the grapes while reducing the potential for herbaceous characters in Cabernet sauvignon. When blended with wines fermented with Lalvin ICV-D254 and Lalvin ICV-D80, Lalvin ICV-D21 brings fresher, sustained intense fruit and lively sensations beginning in the fore-mouth and carrying through to the aftertaste. Lalvin ICV-D21 is also used in very ripe white grapes, barrel-fermented to develop fresh fruit aromas, volume and acidity which compliments wines fermented with Enoferm ICV-D47 in blends. Rosé wines fermented with Lalvin ICV-D21 have enhanced red fruit, fore-mouth volume and balance, making it the perfect blending complement to Rosé wines fermented with Lalvin ICV-GRE.