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First Growth (French: Premier Cru) status is a classification of wines primarily from the Bordeaux region of France.. The wines considered “best of the best” are assigned the rank of Premier Cru, with only five wines, Château Lafite Rothschild, Château Margaux, Château Haut-Brion, Château Latour, and Château Mouton Rothschild rated “First Growth”.
Schizosaccharomyces, the only wine yeast that reproduced by fission whereas most wine yeast reproduce by budding. [4] Zygosaccharomyces, very alcohol-tolerant and can grow in wines up to 18% v/v. Additionally this yeast can survive in extremely high sugar levels (as much as 60% w/w or 60 Brix) and is very resistant to sulfur dioxide. [4]
Wine packaged in a bag usually made of flexible plastic and protected by a box, usually made of cardboard. The bag is sealed by a simple plastic tap. Brettanomyces A wine spoilage yeast that produces taints in wine commonly described as barnyard or band-aids. Brix/Balling A measurement of the dissolved sucrose level in a wine Brouillis
The natural occurrence of fermentation means it was probably first observed long ago by humans. [3] The earliest uses of the word "fermentation" in relation to winemaking was in reference to the apparent "boiling" within the must that came from the anaerobic reaction of the yeast to the sugars in the grape juice and the release of carbon dioxide.
To reach the standard value of 6 bars [4] (600 kPa) inside the bottle, it is necessary to have 18 grams of sugar; the amount of yeast (Saccharomyces cerevisiae) is regulated by the European Commission (Regulation 1622/2000, 24 July 2000) to be 0.3 gram per bottle. The liqueur de tirage is then a mixture of sugar, yeast and still Champagne wine.
The wine goes into bottle, sealed under a crown cap, where the still viable yeast, nutrient and sugar allow the primary fermentation to continue and produce the carbon dioxide that forms the bubbles. Malolactic fermentation may also occur in bottle making a small contribution to the carbon dioxide levels.
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