Urea

Assay (ex N): 99.0 - 100.5 %
Assay (ex N, calc. on dried substance): 99.0 - 101.5 %
Purity (DSC (differential scanning calorimetry)): ≥ 99.5 %
Identity (IR-spectrum): passes test
Appearance of solution (10 %; Wasser; colour): colourless
Appearance of solution (10 %; Wasser; clarity): clear
In water insoluble matter: ≤ 0.003 %
Acidity, Alkalinity: ≤ 0.0005 meq/g
Melting point (DSC): 132 - 135 °C
NH₄ (Ammonium): ≤ 0.0500 %
Chloride (Cl): ≤ 0.0005 %
Sulfate (SO₄): ≤ 0.001 %
Heavy metals (as Pb): ≤ 0.0004 %
Biuret: ≤ 0.05 %
Sulfated ash (600 °C): ≤ 0.005 %
Cu (Copper): ≤ 0.0001 %
Fe (Iron): ≤ 0.0001 %
Pb (Lead): ≤ 0.0002 %
Loss on Drying (105°C): ≤ 1.0 %
Corresponds to ACS, Reag. Ph Eur

Used for the denaturation of proteins and as a mild solubilization agent for insoluble or denatured proteins. Useful for renaturing proteins from samples already denatured with 6 M guanidine chloride such as inclusion bodies. May be used with guanidine hydrochloride and dithiothreitrol (DTT) in the refolding of denatured proteins into their native or active form.

Replaces: UX0065-1