Biuret
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| Biuret | |
|---|---|
| Image:Biuret-2D-skeletal.png | |
| Systematic name | N-(1-aminovinyl)ethene-1,1-diamine |
| Other names | 2-imidodicarbonic diamide, carbamylurea, imidodicarbonic diamide, allophanamide |
| Chemical formula | C2H5N3O2 |
| Molecular mass | 103.080 g/mol |
| Density | x.xxx g/cm3 |
| Melting point | 186–189 °C (decomposes) |
| Boiling point | xx.x °C |
| SMILES | NC(NC(N)=C)=C |
| CAS number | [108-19-0] |
| Disclaimer and references | |
Biuret is a condensation compound of urea, equivalent to two molecules of urea less one of ammonia. It is a white solid soluble in hot water and decomposes at 186–189 °C. The parent compound can be prepared by heating urea above the melting point at which temperature ammonia is expelled.
- 2 CO(NH2)2 → H2N-CO-NH-CO-NH2 + NH3 ↑
A biuret is also a functional group and a class of organic compounds with the general structure RHN-CO-NR-CO-NHR where R is an organic residue. Biurets can be prepared by trimerization of isocyanates. For example the trimer of 1,6-hexamethylene diisocyanate is also known as HDI-biuret.
The biuret reagent is used in the biuret protein assay, a chemical test for proteins not because the reagent contains biuret but because both biuret and proteins have the same response to copper.
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