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U1250

Sigma-Aldrich

Urea

ReagentPlus®, ≥99.5%, pellets

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Synonym(s):
Carbamide, Carbonyldiamide
Linear Formula:
NH2CONH2
CAS Number:
Molecular Weight:
60.06
Beilstein:
635724
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

Quality Level

product line

ReagentPlus®

Assay

≥99.5%

form

pellets

mp

132-135 °C (lit.)

solubility

H2O: 8 M

density

1.335 g/mL at 25 °C (lit.)

SMILES string

NC(N)=O

InChI

1S/CH4N2O/c2-1(3)4/h(H4,2,3,4)

InChI key

XSQUKJJJFZCRTK-UHFFFAOYSA-N

Gene Information

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1 of 4

This Item
51456U063133247
Urea ReagentPlus®, ≥99.5%, pellets

Sigma-Aldrich

U1250

Urea

-
Urea BioUltra, for molecular biology, 99% (T)

Sigma-Aldrich

51456

Urea

Premium Grade
Urea BioXtra, pH 7.5-9.5 (20 °C, 5 M in H2O)

Sigma-Aldrich

U0631

Urea

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

Sigma-Aldrich

33247

Urea

-
form

pellets

form

powder or crystals

form

powder, crystals or pellets

form

solid

mp

132-135 °C (lit.)

mp

132-135 °C (lit.)

mp

132-135 °C (lit.)

mp

132-135 °C (lit.)

solubility

H2O: 8 M

solubility

H2O: 8 M at 20 °C, clear, colorless

solubility

H2O: 5 M at 20 °C, clear, colorless

solubility

H2O: soluble 480 g/L at 20 °C

density

1.335 g/mL at 25 °C (lit.)

density

1.335 g/mL at 25 °C (lit.)

density

1.335 g/mL at 25 °C (lit.)

density

1.335 g/mL at 25 °C (lit.)

Quality Level

300

Quality Level

200

Quality Level

200

Quality Level

200

General description

Urea is a chaotropic agent and is used for protein denaturation. It disturbs the hydrogen bonds in the secondary, tertiary and quaternary structure of proteins. Urea can also disturb hydrogen bonds present in DNA secondary structure.

Application

Urea has been used as a protein denaturing agent.
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.

Legal Information

ReagentPlus is a registered trademark of Merck KGaA, Darmstadt, Germany

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Sheehan D.
Physical Biochemistry: Principles and Applications (2013)
Protein carbonyl determination by a rhodamine B hydrazide-based fluorometric assay.
Georgiou C D, et al.
Redox Biology, 17, 236-245 (2018)
Protein and cell wall polysaccharide carbonyl determination by a neutral pH 2, 4-dinitrophenylhydrazine-based photometric assay.
Georgiou C D, et al.
Redox Biology, 17, 128-142 (2018)
Christos D Georgiou et al.
Redox biology, 17, 128-142 (2018-04-24)
A new 2,4-dinitrophenylhydrazine (DNPH)-based photometric assay is developed for the quantification of carbonyls in protein samples from any biological source by protein carbonyl-DNPH hydrazone formation at acidic pH in the presence of denaturing urea, and subsequent hydrazone solubilization in the
Christos D Georgiou et al.
Redox biology, 17, 236-245 (2018-05-05)
A new fluorometric assay is presented for the ultrasensitive quantification of total protein carbonyls, and is based on their specific reaction with rhodamine B hydrazide (RBH), and the production of a protein carbonyl-RBH hydrazone the fluorescence of which (at ex/em

Protocols

Proteinase K (EC 3.4.21.64) activity can be measured spectrophotometrically using hemoglobin as the substrate. Proteinase K hydrolyzes hemoglobin denatured with urea, and liberates Folin-postive amino acids and peptides. One unit will hydrolyze hemoglobin to produce color equivalent to 1.0 μmol of tyrosine per minute at pH 7.5 at 37 °C (color by Folin & Ciocalteu's Phenol Reagent).

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