Molekula
Ethidium bromide
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Ethidium bromide is a fluorescent dye widely used in molecular biology for DNA staining in gel electrophoresis, allowing visualization of nucleic acids under UV light. It intercalates between DNA bases, emitting a bright orange fluorescence when bound. This product is available as a high-purity solid with a CAS number of 1239-45-8, molecular formula C21H20BrN3, and a molecular weight of 394.31. Store at ambient conditions in a tightly sealed container. The signal word is Danger due to its known mutagenicity and toxicity. Molekula supplies ethidium bromide from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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5 g — £130.50 per pack ex VAT · £156.60 inc. VAT
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20 g — £350.00 per pack ex VAT · £420.00 inc. VAT
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25 g — £389.90 per pack ex VAT · £467.88 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Dark purple crystalline powder |
| Loss on Drying | <7.0% |
| Solubility | C = 10mg/ml, water |
| Purity | >98% |
| DNases/RNases/Proteases | None |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | I |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Maroon powder |
| Melting Point | 238-240 °C |
| Solubility (other solvents) | Soluble in 750 parts chloroform at 20 °C |
| Vapour Pressure | 1.2 × 10⁻¹² mmHg at 25 °C (Estimated) |
| log P (octanol/water) | -0.38 |
Source: PubChem CID 14710 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 34277542 |
| CAS Number | 1239-45-8 |
| IUPAC Name | 5-ethyl-6-phenylphenanthridin-5-ium-3,8-diamine bromide |
| EC Number | 214-984-6 |
| Molecular Formula | C21H20BrN3 |
| Molecular Weight | 394.31 |
| Exact Mass | 393.0841 |
| SMILES | CC[N+]1=C2C=C(C=CC2=C3C=CC(=CC3=C1C4=CC=CC=C4)N)N.[Br-] |
| InChIKey | ZMMJGEGLRURXTF-UHFFFAOYSA-N |
| InChI | 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 |
| PubChem CID | 14710 |
| UN Number | UN2811 |
| REACH Code | Y110 |
| HTS Code | 29339979 |
| Tariff Code | 2933998090 |
Safety & GHS
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Toxic
GHS06
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Serious Health Hazard
GHS08
Hazard statements
- H302 Harmful if swallowed
- H330 Fatal if inhaled
- H341 Suspected of causing genetic defects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+330 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P307+311 IF exposed: Call a POISON CENTER or doctor/physician
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 2,7-Diamino-10-ethyl-9-phenylphenanthridinium bromide
- 2,7-Diamino-9-phenyl-10-ethylphenanthridinium bromide
- 3,8-Diamino-5-ethyl-6-phenylphenanthridinium bromide
- Bromure d'homidium
- Bromuro de homidio
- Dromilac
- EtBr
- Ethydium bromide
- Homidii bromidum
- Homidium bromide
Frequently asked questions
What is ethidium bromide commonly used for?
Ethidium bromide is primarily used as a fluorescent dye for staining nucleic acids (DNA/RNA) in gel electrophoresis and other molecular biology applications.
What is the chemical formula and molecular weight of ethidium bromide?
The chemical formula is C₂₁H₂₀BrN₃ and the molecular weight is 394.31 g/mol.
What safety classification and signal word apply to ethidium bromide?
Ethidium bromide carries the signal word Danger. Its hazard statements are H302 (harmful if swallowed), H330 (fatal if inhaled) and H341 (suspected of causing genetic defects); the Danger signal word arises from its acute inhalation toxicity (H330).
How should ethidium bromide be stored?
Store ethidium bromide at ambient temperature, protected from light, and in a tightly sealed container.
Does Molekula supply ethidium bromide in bulk quantities?
Yes, Molekula can supply ethidium bromide in bulk, with quantities tailored to your research or industrial needs.
What documentation comes with an order of ethidium bromide?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.