33247

Urea

puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99%

• Synonym(s): Carbamide, Carbonyldiamide
• Linear Formula: NH₂CONH₂
• CAS Number: 57-13-6
• Molecular Weight: 60.06
• Beilstein/REAXYS Number: 635724
• EC Number: 200-315-5
• MDL number: MFCD00008022
• UNSPSC Code: 12352100
• PubChem Substance ID: 57648752
• NACRES: NA.21

Properties

• grade: ACS reagent; puriss. p.a.
• Quality Level: 200
• agency: reag. Ph. Eur.
• assay: ≥99%; 99-101% (calc. on dry substance)
• form: solid
• impurities: alkalic reac. substances, complies; ≤0.0005% heavy metals (as Pb); ≤0.05% ammonium (NH₄); ≤0.1% biuret
• ign. residue: ≤0.01% (as SO₄)
• loss: ≤1.0% loss on drying, 105°C, 1 h
• mp: 132-135 °C (lit.); 132-135 °C
• solubility: H₂O: soluble 480 g/L at 20 °C
• density: 1.335 g/mL at 25 °C (lit.)
• anion traces: chloride (Cl^-): ≤5 mg/kg; sulfate (SO₄^2-): ≤10 mg/kg
• cation traces: Fe: ≤2 mg/kg
• suitability: in accordance for appearance of solution; in accordance for identity
• functional group: amine
• SMILES string: NC(N)=O
• InChI: 1S/CH4N2O/c2-1(3)4/h(H4,2,3,4)
• Inchi Key: XSQUKJJJFZCRTK-UHFFFAOYSA-N
• Gene Information: human ... CA1(759) , CA2(760) ; rat ... Ppm1a(24666)

Description

General description

Urea is a colorless, odorless solid. It has prism-like crystals. It forms insoluble nitrate salts with nitric acid and oxalate salts with oxalic acid. On reaction with alkanes or substituted alkanes, it affords crystal-lattice inclusion compounds.

Urea is the most commonly used slow release nitrogen fertilizer.

Application

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.

Urea has been used in the following studies:

• Synthesis of SnO₂ nanoparticles.
• Synthesis of urethanes, ureides and semicarbazides.
• Denaturation of protein isolated from Saccharomyces cerevisiae Y15696 strain.
• Protein electrophoretic studies.

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 1
• flash_point_f: Not applicable
• flash_point_c: Not applicable
• ppe: Eyeshields, Gloves, type N95 (US)