Molekula
Coomassie brilliant blue G-250 (C.I. 42655)
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
Coomassie Brilliant Blue G-250 is a triarylmethane dye widely used as a protein stain in SDS-PAGE and other electrophoretic techniques, as well as a reagent in Bradford protein assays for quantifying protein concentration. It binds reversibly to proteins, shifting its absorption spectrum for easy detection. This high-purity dye has a CAS number of 6104-58-1, a molecular formula of C47H48N3NaO7S2, and a molecular weight of 854.02 g/mol. It is stable at ambient storage conditions and carries no signal word for hazard classification. Molekula supplies Coomassie Brilliant Blue G-250 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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25 g — £41.20 per pack ex VAT · £49.44 inc. VAT
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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.
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Specifications
| Property | Value |
|---|---|
| Appearance | Blue to dark blue or violet powder |
| Moisture | <10% |
| Solubility in water | Soluble |
| Wavelength of maximum absorption (in 50:50 IMS:Water) | 608 -618nm |
| Specific absorption (E 1% in 10 mm cell) at λ max. | ≤ 420nm |
| Absorption Ratio (λmax-15nm/λmax+15nm) | 0.95 - 1.15 |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
For research use only. Not for human use.
Identification
| Property | Value |
|---|---|
| SKU | 62815498 |
| CAS Number | 6104-58-1 |
| IUPAC Name | sodium 3-[[4-[[4-(4-ethoxyanilino)phenyl]-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]-2-methylcyclohexa-2,5-dien-1-ylidene]methyl]-N-ethyl-3-methylanilino]methyl]benzenesulfonate |
| EC Number | 228-058-4 |
| Molecular Formula | C47H48N3NaO7S2 |
| Molecular Weight | 854.02 |
| Exact Mass | 853.2831 |
| SMILES | CCN(CC1=CC(=CC=C1)S(=O)(=O)[O-])C2=CC(=C(C=C2)C(=C3C=CC(=[N+](CC)CC4=CC(=CC=C4)S(=O)(=O)[O-])C=C3C)C5=CC=C(C=C5)NC6=CC=C(C=C6)OCC)C.[Na+] |
| InChIKey | RWVGQQGBQSJDQV-UHFFFAOYSA-M |
| InChI | InChI=1S/C47H49N3O7S2.Na/c1-6-49(31-35-11-9-13-43(29-35)58(51,52)53)40-21-25-45(33(4)27-40)47(37-15-17-38(18-16-37)48-39-19-23-42(24-20-39)57-8-3)46-26-22-41(28-34(46)5)50(7-2)32-36-12-10-14-44(30-36)59(54,55)56;/h9-30H,6-8,31-32H2,1-5H3,(H2,51,52,53,54,55,56);/q;+1/p-1 |
| PubChem CID | 61363 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 3212900050 |
| Tariff Code | 3212900000 |
Safety & GHS
Detailed safety information available in the SDS — see Documents below.
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, 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
- Acid Blue 90
- Benzyl Cyanine G
- Brilliant Blue G
- Brilliant Blue J
- C.I. Acid Blue 90
- Coomassie Blue G 250
- Derma Cyanine G
- Fenazo Blue XXFG
- Impero Azure G
- Optanol Cyanine G
Frequently asked questions
What is Coomassie Brilliant Blue G-250 used for?
Coomassie Brilliant Blue G-250 is primarily used for protein staining in SDS-PAGE gels, Western blotting, and as a dye in biochemical assays.
What is the chemical formula and molecular weight of Coomassie Brilliant Blue G-250?
The formula is **C₄₇H₄₈N₃NaO₇S₂**, and the molecular weight is **854.02 g/mol**.
How should Coomassie Brilliant Blue G-250 be stored?
Store at **ambient temperature** in a tightly sealed container, away from direct light and moisture.
What grades of Coomassie Brilliant Blue G-250 does Molekula supply?
Molekula supplies **analytical-grade** Coomassie Brilliant Blue G-250, suitable for high-precision biochemical applications.
Can Molekula supply Coomassie Brilliant Blue G-250 in bulk?
Yes, Molekula can provide bulk quantities of Coomassie Brilliant Blue G-250—please contact us for pricing and lead times.
What documentation comes with an order of Coomassie Brilliant Blue G-250?
Each order includes a **Certificate of Analysis (CoA)** with batch-specific data, a **Material Safety Data Sheet (MSDS)**, and a product specification sheet.
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.