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E1510 Sigma-Aldrich

Ethidium bromide solution

BioReagent, for molecular biology, 10 mg/mL in H2O

Synonym: 3,8-Diamino-5-ethyl-6-phenylphenanthridinium bromide, EtBr, Homidium bromide

  • CAS Number 1239-45-8

  • Empirical Formula (Hill Notation) C21H20BrN3

  • Molecular Weight 394.31

  •  Beilstein/REAXYS Number 3642536

  •  MDL number MFCD00011724

  •  PubChem Substance ID 24894418

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Description

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.

Ethidium bromide solution has been used:
• as a stain to visualize U937 cells to assess cell viability
• to detect polymerase chain reaction products
• in agarose gel electrophoresis based gel retardation assay

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.

Packaging

10 mL in glass bottle

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.

Other Notes

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Safety & Documentation

Safety Information

Symbol 
Signal word 
Danger
Hazard statements 
Precautionary statements 
RIDADR 
UN 2810 6.1 / PGIII
WGK Germany 
2

Documents

Certificate of Analysis

Certificate of Origin

Protocols & Articles

Articles

Ethidium Bromide

Synonyms: 3,8-Diamino-5-ethyl-6-phenylphenanthridinium bromide; 2,7-Diamino-10-ethyl-9-phenylphenanthridinium bromide; Homidium Bromide; Dromilac; EtBr
Keywords: Absorption, Electrophoresis, Gel electrophoresis, Melting, Molecular biology, Veterinary

Protocols

Experienced User Protocol | GenElut Mammalian Genomic DNA Miniprep Kit

For experienced users, an abbreviated protocol is listed below. For data, images, troubleshooting and other information, please see the full length protocol page.
Keywords: PAGE

GenElute Bacterial Genomic DNA Kit Protocol

Our GenElute™ Bacterial Genomic DNA Kit provides a simple and convenient way to isolate pure DNA from a variety of cultured bacteria. The kit contains all of the reagents needed to isolate and purify...
Keywords: AGE, Amplification, Cell disruption, Centrifugation, Degradations, Digestions, Electrophoresis, Evaporation, Gel electrophoresis, Molecular biology, Nucleic acid denaturation, Phase transitions, Polymerase chain reaction, Precipitation, Pulsed field gel electrophoresis

GenElute Bacterial Genomic DNA Kit, Experienced User Protocol

For experienced users, an abbreviated protocol is listed below. For data, images, troubleshooting and other information.

GenElute Mammalian Genomic DNA Miniprep Kit Protocol

The GenElute™ Mammalian Genomic DNA Miniprep Kit provides a simple and convenient way to isolate pure genomic DNA from a variety of cultured cells, tissues (including rodent tails), and fresh whole b...
Keywords: AGE, Amplification, Anticoagulants, Cell disruption, Centrifugation, DNA purification, Degradations, Digestions, Electrophoresis, Evaporation, Gel electrophoresis, Molecular biology, Nucleic acid denaturation, Phase transitions, Polymerase chain reaction, Precipitation, Purification, Sample preparations, Sequencing

GenElute™ Blood Genomic DNA Kit Protocol (NA2010, NA2020)

Our GenElute™ Blood Genomic DNA Kit provides a simple and convenient way to isolate pure genomic DNA from fresh or aged (older than 24 hours) whole blood. The kit combines the advantages of silica bi...
Keywords: AGE, Addition reactions, Amplification, Anticoagulants, Cell disruption, Centrifugation, Digestions, Electrophoresis, Evaporation, Gel electrophoresis, Molecular biology, Nucleic acid denaturation, Phase transitions, Polymerase chain reaction, Precipitation, Purification, Sequencing

Related Content

Ethidium bromide solution (e1511) Discussion and Reviews

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Peer-Reviewed Papers
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References

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01494 Nancy-520, suitable for RT-PCR, ≥97.0% (HPCE) Less mutagenic alternative to EtBr
E7637 Ethidium bromide, BioReagent, for molecular biology, powder

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