Merck
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B2261

Sigma-Aldrich

bisBenzimide H 33342 trihydrochloride

≥98% (HPLC and TLC)

Synonym(s):
2′-(4-Ethoxyphenyl)-5-(4-methyl-1-piperazinyl)-2,5′-bi-1H-benzimidazole trihydrochloride, HOE 33342, Hoechst 33342, bisBenzimide
Empirical Formula (Hill Notation):
C27H28N6O · 3HCl · xH2O
CAS Number:
Molecular Weight:
561.93 (anhydrous basis)
Beilstein:
1234011
MDL number:
PubChem Substance ID:
NACRES:
NA.47

Quality Level

assay

≥98% (HPLC and TLC)

form

powder

pH

1.7 (20 °C)

solubility

H2O: 20 mg/mL
phosphate buffer: precipitates

suitability

suitable for fluorescence

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

−20°C

SMILES string

Cl[H].Cl[H].Cl[H].CCOc1ccc(cc1)C2=NCc3cc(ccc3N2)C4=NCc5cc(ccc5N4)N6CCN(C)CC6

InChI

1S/C29H32N6O.3ClH/c1-3-36-25-8-4-20(5-9-25)28-30-18-22-16-21(6-10-26(22)32-28)29-31-19-23-17-24(7-11-27(23)33-29)35-14-12-34(2)13-15-35;;;/h4-11,16-17H,3,12-15,18-19H2,1-2H3,(H,30,32)(H,31,33);3*1H

InChI key

FYEVKHPLBHLWHK-UHFFFAOYSA-N

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Application

Bisbenzimide Hoechst 33342 is a specific stain for AT-rich regions of double-stranded DNA and has been shown to displace several known DNA intercalators. This fluorescent dye has been used in sorting living cells based on DNA content, used in flow cytometry for the determination of DNA content, and for the visualization of chromatin distribution in living cells. It has been used to detect BrdU incorporation into cells and in studying the initial stages apoptosis and cellcycle distribution., Chromosomes that are dividing or replicating will not stain with this dye.
Useful for staining DNA, chromosomes and nuclei. May be used for fluorescence microscopy or flow cytometry.
Excitation max. = 346 nm
Emission max. = 460 nm

Packaging

25 mg in poly bottle
100, 500 mg in glass bottle
1 g in glass bottle

Biochem/physiol Actions

Membrane-permeable, fluorescent DNA stains with low cytotoxicity that intercalate in A-T regions of DNA.

Physical properties

Fluorescent properties of bisBenzimide H 33342:
Free dye: Excitation maximum = 340 nm, Emission maximum = 510 nm (5 mM HEPES, 10 mM NaCl, pH 7.0) DNA complex: Excitation maximum = 355 nm, Emission maximum = 465 nm (5 mM HEPES, 10 mM NaCl, pH 7.0)

Preparation Note

This product is soluble in water (50 mg/ml), yielding a clear solution. The pH of a 2% solution is 1.9. It has been observed that this material will precipitate from phosphate buffer solutions.
Aqueous solutions are stable for 1 month if kept in the dark at 2-8 °C.

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Origin

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