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Yeast (Saccharomyces cerevisiae), emulsifier E491 (sorbitan monostearate). UCLM S377 was selected by the Castilla La Mancha University for its ability to produce very structured long ageing red wines.

Fermentation abilities:
- Rapid fermentation start.
- Rather slow fermentation kinetic.
- Total loss of sugars.
- Alcohol tolerance: 14-15 % vol./vol.
- Fermentation temperature: 16 to 35°C. This strain is sensitive to brutal temperature changes, it requires regular fermentation conditions.
- High nitrogen requirement : In a must which available nitrogen is between 150 and 180 mg/L this strain requires at least 2 nitrogen supplies (20g/hl DAP + 20g/hl Bioferm® 24-48hours after yeast inoculation and 20g/hl of DAP and Bioferm® between the third and mid-fermentation.
- Strong resistance to SO2.