Week_8B___Yeasts - Alcoholic fermentation Wine, beer, etc....

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March 12 Treats of Yeasts Alcoholic fermentation Wine, beer, etc.
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YEASTS •Single celled •Reproduce by budding •Sometimes with a mycelial form (dimorphic)
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Sugar + yeast ethyl alcohol(C 2 H 5 OH) + CO 2 No oxygen ALCOHOLIC FERMENTATION
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Grape Juice Sulfur Sodium bisulfite or SO 2 Adjust pH Rack Bottle Age Fining Agents charcoal egg white gelatin Racking Wine Yeast Wild Yeast
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Making champagne: Fundamental process of fermentation Is like that for wine but…… Sugar is added near the end and bottle Is capped to give the “bubbly” Later, the degorgeur removes spent yeast.
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What makes one wine different from another ? A. Varieties of grapes Savignon blanc Chardonnay Reisling Cabernet savignon Merlot Pino noir
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What makes one wine different from another ? A. Varieties of grapes Savignon blanc Chardonnay Reisling Cabernet savignon Merlot Pino noir B. Weather and soil C. Native and introduced yeasts D. Other “additives”
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Botrytis cinerea : The Noble Rot
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Week_8B___Yeasts - Alcoholic fermentation Wine, beer, etc....

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