The substance DMDC (also DMPC = Dimethylpyrocarbonate or Pyrokohlensäuredimethylester) is a ester of pyrocarbonic acid. The artificially manufactured substance is authorized within the EU as a food preservative E 242 (Velcorin is one of the best-known brands). It is mainly used in fruit juices and soft drinks as a declaration-free cold disinfectant. Dimethyl dicarbonate kills harmful beverage pests such as fermentation yeast by carbomethoxylation of proteins. After the addition to the drink it decays medium Temperature dependent within a few hours completely in very small amounts of methanol and carbon dioxide and is then no longer detectable.
According to EU Regulation is dimethyl dicarbonate in the winemaking For grape. Wine (all quality levels), Perlwein. sparkling wine and Fortified authorized. A maximum of 200 mg / l may be added; in the finished product the substance may no longer be detectable. Since 2012, the use is only more semiarid. lovely and sweeten Crying allowed (until then this was up to one) Residual sugar content of 5 g / l allowed). In Austria, however, DMDC may only be used for the lowest quality wine. Above all, it serves as protection against red wines Mäuseln and horse sweat, because with it an excessive occurrence of the yeast species causing these grape faults Brettanomyces bruxellensis is prevented.