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for molecular biology, ≥99% (titration), free-flowing, Redi-Dri

1,3-Diaza-2,4-cyclopentadiene, Glyoxaline
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:

Quality Level


for molecular biology

vapor pressure

<1 mmHg ( 20 °C)

product line



≥99% (titration)


crystalline powder




6.2-7.8 (25 °C)

pKa (25 °C)



256 °C (lit.)


88-91 °C (lit.)


diagnostic assay manufacturing

foreign activity

DNase, RNase and protease, none detected

SMILES string




InChI key


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General description

Imidazole is a heterocyclic compound with a five-membered planar ring. It is amphoteric and highly polar. The pharmacophore of imidazole exists in bioactive compounds including amino acids, plant growth regulators and therapeutic agents.


Imidazole has been used
  • in the lysis, wash and elution buffer for the purification of histidine tagged Sonic Hedgehog(shh-N) protein
  • in elution buffer in stepwise gradient for the purification of histidine tagged aldo keto reductases using nickel affinity chromatography
  • as a component of homogenization buffer for the purification of phagosomal compartments from dendritic cells

Excellent for buffers in the range of pH 6.2-7.8

Biochem/physiol Actions

Imidazole derivatives have antibacterial, antifungal and anticancer functionality. It interacts with DNA and also binds to protein and stops cell division. It also acts as a microtubule destabilizing agents and inhibits topoisomerase and Cytochrome P450 Family 26 Subfamily A Member 1 (CYP26A1) enzymes. Imidazole based anticancer drug find applications in cancer chemotherapy. It is used as buffer component for purification of the histidine tagged recombinant proteins in immobilized metal-affinity chromatography (IMAC).

Legal Information

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

Signal Word


Hazard Statements

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Repr. 1B - Skin Corr. 1C

Storage Class Code

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects



Flash Point(F)

293.0 °F - closed cup

Flash Point(C)

145 °C - closed cup

Certificate of Analysis

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Origin

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Molecular pathways regulating pro-migratory effects of Hedgehog signaling
Hochman E, et al.
The Journal of Biological Chemistry, 281(45), 33860-33870 (2006)
Alan M Sandercock et al.
Molecular cancer, 14, 147-147 (2015-08-01)
Monolayer cultures of immortalised cell lines are a popular screening tool for novel anti-cancer therapeutics, but these methods can be a poor surrogate for disease states, and there is a need for drug screening platforms which are more predictive of
Pam M Van Ry et al.
Molecular therapy : the journal of the American Society of Gene Therapy, 23(8), 1285-1297 (2015-06-09)
Duchenne muscular dystrophy (DMD) is a fatal neuromuscular disease caused by mutations in the dystrophin gene, leading to the loss of a critical component of the sarcolemmal dystrophin glycoprotein complex. Galectin-1 is a small 14 kDa protein normally found in skeletal
William A Gaines et al.
Nature communications, 6, 7834-7834 (2015-07-29)
The conserved budding yeast Rad51 paralogues, including Rad55, Rad57, Csm2 and Psy3 are indispensable for homologous recombination (HR)-mediated chromosome damage repair. Rad55 and Rad57 are associated in a heterodimer, while Csm2 and Psy3 form the Shu complex with Shu1 and
Miriam Lee et al.
The Journal of cell biology, 210(3), 451-470 (2015-07-29)
Dynamin-like GTPases of the atlastin family are thought to mediate homotypic endoplasmic reticulum (ER) membrane fusion; however, the underlying mechanism remains largely unclear. Here, we developed a simple and quantitative in vitro assay using isolated yeast microsomes for measuring yeast

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