Dimethyl dicarbonate
From Wikipedia, the free encyclopedia
| Dimethyl dicarbonate | |
|---|---|
 |
|
| IUPAC name | methoxycarbonyl methyl carbonate |
| Other names | DMDC dicarbonic acid dimethyl ester dimethyl pyrocarbonate Velcorin |
| Identifiers | |
| CAS number | [4525-33-1] |
| SMILES | O=C(OC(=O)OC)OC |
| Properties | |
| Molecular formula | C4H6O5 |
| Molar mass | 134.09 |
| Appearance | Colourless liquid |
| Density | 1.25 g/ml (liquid) |
| Melting point |
16-18°C |
| Boiling point |
172°C |
| Viscosity | 2.1 Pa·s |
| Hazards | |
| Main hazards | Toxic |
| R-phrases | 22-23-34 |
| S-phrases | S7/9, S26, S36/37/39, S45 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
Dimethyl dicarbonate or DMDC is a colourless liquid with a sharp odour. Its primary use is as a beverage preservative or sterilant (INS No. 242), and acts by inhibiting the enzymes acetate kinase and L-glutamic acid decarboxylase [1]. It has also been proposed that methoxycarbonylation of the histidine part of the enzymes alcohol dehydrogenase and glyceraldehyde 3-phosphate dehydrogenase by DMDC inhibits these essential enzymes also [2]. Once it has been added to beverages, the efficacy of the chemical is provided by the following reactions:
- DMDC + H2O → 2CH3OH + 2CO2
- DMDC + EtOH → Ethyl methyl carbonate
- DMDC + NH3 → Methyl carbamate
- DMDC + Amino acid → Derived carboxymethyl
DMDC is sometimes used as a preservative in wine as a replacement to sulfur dioxide, inactivating wine spoilage yeasts such as Brettanomyces. In the U.S. the FDA approved its use in wines in 1988, with the maximum permitted level being set at 200mg/L, and only if there was less than 500 yeast cells/mL at time of dosage. Usage has also been approved in Germany (since 1978) and New Zealand. The application of DMDC is particularly useful when wine needs to be sterilised but cannot be sterile filtered, pasteurized, or sulfured.
DMDC has also been used to sterilise coffee, tea, cider, fruit wine and mead.
[edit] References
 |
This article does not cite any references or sources. (September 2007) Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed. |
