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Abbreviation for the polysaccharide carboxymethylcellulose (also cellulose gum). The substance is used in detergents as a soil carrier, in pharmacy as a coating agent, as well as in the food industry as a thickener and water retention system. In viticulture CMC is since August 1, 2009 in the context of the new EU wine market regulations as Means in winemaking approved for all types of wine. It is used for crystal stabilization. CMC deposits on the surface of dissolved Weinstein and thereby prevents crystal growth. First attempts were already made in the early 1980s. By a recommendation of the OIV the wine recognition was initiated. The agent is derived from vegetable fibers. The amount is limited to a maximum of 10 g / hl, the application can be done as a powder, granules or viscous liquid. The latter is most soluble in wine. CMC works in a similar way metatartaric, but has the advantage over this that it is insensitive to temperature and also effective in warm conditions.

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