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E7637

Sigma-Aldrich

Ethidium bromide

BioReagent, for molecular biology, powder

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Synonym(s):
3,8-Diamino-5-ethyl-6-phenylphenanthridinium bromide, EtBr, Homidium bromide
Empirical Formula (Hill Notation):
C21H20BrN3
CAS Number:
Molecular Weight:
394.31
Beilstein:
3642536
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.31

grade

for molecular biology

Quality Level

product line

BioReagent

form

powder

technique(s)

electrophoresis: suitable

mp

260-262 °C (dec.) (lit.)

fluorescence

λex 360 nm; λem 590 nm in PBS
λex 526 nm; λem 605 nm (10 mM TBE; pH 8.0;)
λex 526 nm; λem 605 nm in aqueous buffer

suitability

suitable for gel electrophoresis

SMILES string

[Br-].CC[n+]1c(-c2ccccc2)c3cc(N)ccc3c4ccc(N)cc14

InChI

1S/C21H19N3.BrH/c1-2-24-20-13-16(23)9-11-18(20)17-10-8-15(22)12-19(17)21(24)14-6-4-3-5-7-14;/h3-13,23H,2,22H2,1H3;1H

InChI key

ZMMJGEGLRURXTF-UHFFFAOYSA-N

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E1510E8751E1385
Ethidium bromide BioReagent, for molecular biology, powder

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Ethidium bromide

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Ethidium bromide solution BioReagent, for molecular biology, 10 mg/mL in H2O

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E1510

Ethidium bromide solution

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Ethidium bromide ~95% (HPLC)

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E8751

Ethidium bromide

-
Ethidium bromide solution BioReagent, for molecular biology, 500 μg/mL in H2O

Sigma-Aldrich

E1385

Ethidium bromide solution

Essential+ Grade
product line

BioReagent

product line

BioReagent

product line

-

product line

BioReagent

form

powder

form

-

form

-

form

-

technique(s)

electrophoresis: suitable

technique(s)

electrophoresis: suitable

technique(s)

-

technique(s)

electrophoresis: suitable

mp

260-262 °C (dec.) (lit.)

mp

-

mp

260-262 °C (dec.) (lit.)

mp

-

fluorescence

λex 360 nm; λem 590 nm in PBS, λex 526 nm; λem 605 nm (10 mM TBE; pH 8.0;), λex 526 nm; λem 605 nm in aqueous buffer

fluorescence

-

fluorescence

-

fluorescence

-

Application

Ethidium bromide (EtBr) is the most commonly used nucleic acid stain for PAGE or agarose gel electrophoresis. The fluorescence of EtBr increases 21-fold upon binding to double-stranded RNA and 25-fold on binding double-stranded DNA so that destaining the background is not necessary with a low stain concentration (10 μg/ml). Ethidium bromide has been used in a number of fluorimetric assays for nucleic acids. It has been shown to bind to single-stranded DNA (although not as strongly) and triple-stranded DNA. Because of its ability to bind to DNA, EtBr is an inhibitor of DNA polymerase.

Frameshift mutagen which intercalates double-stranded DNA and RNA.

Biochem/physiol Actions

Ethidium bromide intercalates double-stranded DNA and RNA and acts as a frameshift mutagen. It can also be used in conjunction with acridine orange to differentiate between viable, apoptotic and necrotic cells.

Reconstitution

For staining a gel after electrophoresis, dilute a sample of the stock solution to 0.5 μg/ml with water and incubate the gel for 15-30 min. Destaining is usually not needed but can be carried out in water for 15 min if decreased background is necessary. The DNA bands can then be detected on a UV light box (254 nm wavelength). Ethidium bromide can also be incorporated into the gel and running buffer at 0.5 μg/ml and visualized immediately after electrophoresis.

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Product No.
Description
Pricing

Pictograms

Skull and crossbonesHealth hazard

Signal Word

Danger

Hazard Statements

Hazard Classifications

Acute Tox. 1 Inhalation - Acute Tox. 4 Oral - Muta. 2

Storage Class Code

6.1A - Combustible, acute toxic Cat. 1 and 2 / very toxic hazardous materials

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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Ethidium bromide is a well-known and widely used fluorescent dye in biotechnology research.

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