Molekula
Bromothymol Blue
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
Bromothymol Blue is a pH-sensitive dye used as an indicator in acid-base titrations, biological staining, and environmental testing to visually assess pH levels between 6.0 and 7.6, shifting from yellow to blue. It appears as a blue-green crystalline powder with a molecular formula of C27H28Br2O5S and a molecular weight of 624.38 g/mol. Stable at ambient conditions, it requires no special signal warnings. Molekula supplies Bromothymol Blue 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.
Often bought together
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 — £77.30 per pack ex VAT · £92.76 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.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Pink/Purple/Brown powder |
| Loss on Drying | ≤ 3% |
| Dye Content | ≥95% |
| Transition Range | pH 5.8 - 7.6 Yellow - Blue |
| Solubility at 0.1% (95% Ethanol) | Clear Solution |
| Wavelength of maximum absorption(pH 5.8) λ1 max | 430 - 435 nm |
| Wavelength of maximum absorption (pH 7.6) λ2 max | 615 - 618 nm |
| Absorptivity (E 1% in 1cm cell at λ1 max),pH 5.8 | 260 - 300 |
| Absorptivity (E 1% in 1cm cell at λ2 max),pH 7.6 | 470 - 520 |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 35458451 |
| CAS Number | 76-59-5 |
| IUPAC Name | 2-bromo-4-[3-(3-bromo-4-hydroxy-2-methyl-5-propan-2-ylphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]-3-methyl-6-propan-2-ylphenol |
| EC Number | 200-971-2 |
| Molecular Formula | C27H28Br2O5S |
| Molecular Weight | 624.38 |
| Exact Mass | 624.0004 |
| SMILES | CC1=C(C=C(C(=C1Br)O)C(C)C)C2(C3=CC=CC=C3S(=O)(=O)O2)C4=C(C(=C(C(=C4)C(C)C)O)Br)C |
| InChIKey | NUHCTOLBWMJMLX-UHFFFAOYSA-N |
| InChI | InChI=1S/C27H28Br2O5S/c1-13(2)17-11-20(15(5)23(28)25(17)30)27(19-9-7-8-10-22(19)35(32,33)34-27)21-12-18(14(3)4)26(31)24(29)16(21)6/h7-14,30-31H,1-6H3 |
| PubChem CID | 6450 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29349944 |
| Tariff Code | 2934999090 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
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
- 3,3'-Dibromothymolsulfonphthalein
- Blue, Bromothymol
- Blue, Bromthymol
- Bromothymol blue (sodium salt)
- BROMTHYMOL BLUE
- Bromthymolblau
- C27H28Br2O5S
- Dibromothymolsulfonphthalein
- Dibromothymolsulfophthalein
- Thymol, 6,6'-(3H-2,1-benzoxathiol-3-ylidene)bis(2-bromo-, S,S-dioxide
Frequently asked questions
What is Bromothymol Blue commonly used for?
Bromothymol Blue is primarily used as a pH indicator in laboratories, turning yellow in acidic solutions, blue in basic solutions, and green at neutral pH (~6.0–7.6). It is also used in biological buffers and as a dye in microscopy.
What is the chemical formula and molecular weight of Bromothymol Blue?
The chemical formula is **C₂₇H₂₈Br₂O₅S**, and the molecular weight is **624.38 g/mol**.
How should Bromothymol Blue be stored?
Store at **ambient temperature** in a tightly sealed container, away from direct sunlight and moisture.
What grades of Bromothymol Blue does Molekula supply?
Molekula supplies **analytical and reagent-grade Bromothymol Blue**, suitable for laboratory and research applications.
Can Molekula supply Bromothymol Blue in bulk quantities?
Yes, we offer **bulk packaging options** for Bromothymol Blue—please contact our sales team for custom quantities and pricing.
What documentation comes with an order of Bromothymol Blue?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
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.