CellarScience® CellarTan F | Fermentation Tannin

CellarScience® CellarTan F | Fermentation Tannin

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  • Add to Red Wine Fermentation on the skin
  • Binds with anthocyanins and stabilizes color
  • Improves mouthfeel and body
  • Mix of both ellagic and proanthocyanidin tannins

CellarTan F is designed to be added to red wine fermentations where it binds color, improves body and mouthfeel, and softens the overall tannin profile. Used during the early stages of fermentation when anthocyanins are being released from the grape skin in the presence of alcohol and need to be stabilized for long term color retention.

CellarTan F is a combination of ellagic tannins and proanthocyanidin tannins. Ellagic tannins are hydrolysable oak tannins that break down in wine. They react with grape skin derived phenolics to form flavono-ellagitannins which are hybrid compounds that play a key role in color stability while also softening the mouthfeel of your wine. Ellagic tannins also have potent antioxidant properties that reduce the need for SO2.

Proanthocyanidin tannins, or condensed tannins, also contribute to color stability, taste, and mouthfeel. Through polymerization, anthocyanins cap the end of tannin chains to form stable color throughout the life of your wine. They also increase the body and structure of wine.

Dissolve 0.2 to 2 g per gallon (0.05 to 0.5 g per liter) in juice or water. Add to must at least 30 min after any SO2 addition and mix well. If you are unsure where to start within the suggested range, we recommend a dosage of 1 g per gallon (0.25 per liter) and adjust as desired on future fermentations.


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