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7 Cards in this Set
- Front
- Back
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Oxygen in Winemaking
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Negative factors: changing flavour,
Prevention: antioxidant-sulfur dioxide, night harvest (cooler temp) flushing in airtight with carbon dioxide or nitrogen, Anaerobic winemaking was pioneered in New World. |
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Oxygen in Maturation
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Anaerobically - inert vessels, stainless steel or cement glass or epoxy lined, full tank.
Aerobically - wooden vessels usually oak vessels, Dose of oxidation - size of the vessel, length of time and quantity of wine in vessel. Maturation in stainless steel - with controlled oxidation. Oxidation - develop complexity and depth of aromas, soften tannins, stabilized color. Fortrified wines - Olroso Shery, Tawny Port, Rutherglen Muscat in huge vessels not full with wine, aromas caramel, toffee, coffee, nuts ... |
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Sulfur Dioxide
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S02-antioxidant and antiseptic.
toxic and limited by law Antioxidant - SO2 readily react with oxygen before O2 harm grape, juice or wine and aldehydes making wine stale. Antiseptic - toxic for yeast strains and bacteria (acetic acid bacteria). Sulfur candle sanitation. |
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Winery Vessels
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Oak - Primarily used to add tannins in wine and rich complexity and texture of wine, stabilize color in red wine. Aroma - toast, vanilla, smokiness.
European Oak - (Quercus petraea and Quercus robur), more expensive (splitting trunk), more porous, toast and vanilla flavor, fine grain tannins. American Oak - (Quercus alba), more aromatic, sawing releases more flavours, sweet vanilla and coconut. |
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Small Oak Barrel
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bent staves by charring, level of charring increase level of toasty and smoky aroma.
225 Lit Bordeaux barrique 228 Lit Burgundy piece More flavor than stainless steel vessels transferred to oak barrels. |
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Large Oak Vessels
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200 hl - using for fermentation, and maturation, less oak flavor but slow oxidation.
Oak chips and staves in stainless steel vessels |
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Inert Vessels
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Stainless steel vessel - easy cleaning, possible mount temperature system regulation. Possible insert oak chips...
Concrete vessel - expensive, difficult for cleaning, no cooling system needed. |
