Molekula
Bromophenol Blue
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Bromophenol Blue is a pH indicator commonly used in biochemical assays and electrophoresis to monitor pH changes and track molecular migration. It appears yellow below pH 3.0 and turns blue above pH 4.6. Available in powder form, it has a molecular formula of C19H10Br4O5S, a molecular weight of 669.96 g/mol, and is stable at ambient temperatures.
Molekula supplies Bromophenol Blue in 25 g packs, from £79.56 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and safety data sheets are available in 5 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
In stock — same-day dispatch
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 — £66.30 per pack ex VAT · £79.56 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 | Powder |
| Loss on Drying | < 1% (110°C) |
| Storage Temperature | +20 ° C |
| Solubility | 0.1% (95% Ethanol): Clear solution |
| Maximum Absoprtion | Wavelength of maximum absorption(pH 3.1) λ1 max: 434-439 nm, Wavelength of maximum absorption (pH 4.6) λ2 max: 590-593 nm |
| Absorptivity | Absorptivity (A1%/1cm at pH 3.1, at λ1 max): 350-385, Absorptivity (A1%/1cm at pH 4.6, at λ2 max): 940-1000 |
| Transition Range | pH 3.1 - 4.6 Greenish Yellow–Blue Violet |
| Loss on Drying (110°C, 1hr) | 0.89% |
| Transition Range pH 3.0-4.6 | Greenish yellow |
| Absorptivity (E1% 1CM CELL pH 3.3) @ 436nm | 363 |
| Absorptivity (E1% 1cm cell pH 4.6) @ 591nm | 995 |
| Solubility (0.1% EtOH) | Clear yellow solution |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Solubility (other solvents) | Soluble in acetic acid |
| pKa | pKa = 4 |
Source: PubChem CID 8272 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 14572165 |
| CAS Number | 115-39-9 |
| IUPAC Name | 2,6-dibromo-4-[3-(3,5-dibromo-4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol |
| EC Number | 204-086-2 |
| Molecular Formula | C19H10Br4O5S |
| Molecular Weight | 669.96 |
| Exact Mass | 669.6942 |
| SMILES | C1=CC=C2C(=C1)C(OS2(=O)=O)(C3=CC(=C(C(=C3)Br)O)Br)C4=CC(=C(C(=C4)Br)O)Br |
| InChIKey | UDSAIICHUKSCKT-UHFFFAOYSA-N |
| InChI | InChI=1S/C19H10Br4O5S/c20-12-5-9(6-13(21)17(12)24)19(10-7-14(22)18(25)15(23)8-10)11-3-1-2-4-16(11)29(26,27)28-19/h1-8,24-25H |
| PubChem CID | 8272 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29349990 |
| Tariff Code | 2934999090 |
Safety & GHS
Detailed safety information available in the SDS — see Documents below.
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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- 3,3',5,5'-Tetrabromophenolsulfonphthalein
- 3',3'',5',5''-Tetrabromophenolsulfonephthalein
- 3',3'',5',5''-Tetrabromophenolsulfophthalein
- Albutest
- Blue, Bromophenol
- Blue, Bromphenol
- Blue, Tetrabromophenol
- BROMPHENOL BLUE
- Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis(2,6-dibromo)-, S,S-dioxide
- Tetrabromphenol Blue
Frequently asked questions
What is Bromophenol Blue used for?
Bromophenol Blue is primarily used as a pH indicator in laboratory settings, changing color from yellow to purple in the pH range of 3.0 to 4.6.
What is the chemical formula and molecular weight of Bromophenol Blue?
The formula is C19H10Br4O5S with a molecular weight of 669.96 g/mol.
How should Bromophenol Blue be stored?
It should be stored at ambient temperature, protected from light and moisture.
What grade of Bromophenol Blue does Molekula supply?
Molekula supplies Bromophenol Blue as a powder meeting its listed specification, including a transition range of pH 3.0-4.6, loss on drying below 1% at 110°C and defined absorptivity values. Please contact us for further grade details.
Can Molekula supply Bromophenol Blue in bulk?
Yes, Molekula can supply Bromophenol Blue in bulk quantities—please contact us for pricing and availability.
What documentation comes with a purchase of Bromophenol Blue?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Where can I buy Bromophenol Blue?
Directly from Molekula, which lists Bromophenol Blue in 25 g packs from £79.56 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
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.