BTB
Synonym(s):3′,3′′-dibromothymolsulfonephthalein sodium salt;3,3`-Dibromothylmolsulfonphthalein Sodium Salt;Bromothymol blue sodium salt;Bromothymol Blue, Sodium Salt;Bromthymol Blue sodium salt
- CAS NO.：34722-90-2
- Empirical Formula: C27H29Br2NaO5S
- Molecular Weight: 648.38
- MDL number: MFCD00077263
- EINECS: 252-169-7
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-04-24 14:58:38
What is BTB?
Chemical properties
Dark greenish gold crystalline powder
The Uses of BTB
It is employed as a pH indicator which is yellow at pH ? 6.0 and blue at pH ? 7.6. It finds its major application in lithium battery, textiles and antagonists.
The Uses of BTB
Suitable for use:
- In preparations of pH indicator solutions
- In phospholipid staining on tissues and cells prepared on microscopy slides
The Uses of BTB
Bromothymol Blue sodium salt has been used as a pH indicator in the yeast growth media (YPD, yeast extract peptone dextrose).
What are the applications of Application
Bromothymol blue sodium salt is a pH indicator which is yellow at pH ≤ 6.0 and blue at pH ≥ 7.6
General Description
Bromothymol Blue is a sulfonated hydroxyquinone in acidic solutions. In alkaline solutions, it is present as a dianion that is blue with a larger conjugated system than the yellow hydroxyquinone. Both forms are lipophilic. It is also known as bromthymol blue or dibromothymolsulfonphthalein.
Biochem/physiol Actions
Bromothymol Blue is a pH-indicator. It is also used for carbonic anhydrase assay due to the conversion of carbon dioxide to bicarbonate.
Properties of BTB
| Melting point: | 200-202°C |
| Density | 0.990 |
| storage temp. | room temp |
| solubility | Solubility Soluble in water, ethanol |
| form | Powder |
| pka | 7.0, 7.1(at 25℃) |
| color | Orange-brown to dark green |
| Odor | Characteristic odour |
| PH Range | Yellow (6.0) to blue (7.6) |
| Water Solubility | SOLUBLE |
| λmax | 615nm, 392nm |
| BRN | 6887926 |
| Stability: | Stable. Incompatible with strong oxidizing agents. |
| Major Application | Lithium battery, textiles, antagonists |
| CAS DataBase Reference | 34722-90-2(CAS DataBase Reference) |
| EPA Substance Registry System | Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[2-bromo-3-methyl-6-(1-methylethyl)-, monosodium salt (34722-90-2) |
Safety information for BTB
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. |
Computed Descriptors for BTB
BTB manufacturer
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