| Alternate Names | Phenolsulfonephthalein Sodium Salt |
| Application | Phenol Red Sodium Salt is a water soluble pH indicator commonly employed in cell biology laboratories as a cell tissue culture pH marker |
| CAS Number | 34487-61-1 |
| Molecular Weight | 376.36 |
| Molecular Formula | C19H13NaO5S |
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data (including water content).
Phenol Red sodium salt is a water soluble pH indicator used in the 6.8 (yellow) to 8.2 (red) range. It is commonly employed in cell biology laboratories as a cell tissue culture pH marker. Under normal conditions, phenol red added to the growth medium will have a pink-red color. Usually 15 mg/l is used to produce this effect. If problems arise, such as dying cells or overgrowth of contaminants, this will cause a change in pH resulting in a change in indicator color. This color change is an indication that the medium needs to be replaced. Additionally, Phenol Red could potentially be useful as a differentiation factor.
TECHNICAL INFORMATION
| Appearance | Crystalline or powder |
| Physical State | Solid |
| Solubility | Soluble in water yielding a dark red solution (25 mg/ml), alcohol (4 mg/ml), methanol, ethanol (200 mg/ml), and aqueous alkali hydroxides or carbonates with formation of a red colored solution. |
| Storage | Store at room temperature |
| Melting Point | 285° C (lit.)(dec.) |
| pK Values | pKa: 7.9 |
SAFETY INFORMATION
| WGK Germany | 3 |
| PubChem CID | 23686673 |
| Merck Index | 14:7247 |
| MDL Number | MFCD00066901 |
| EC Number | 252-057-8 |
| Beilstein Registry | 6260026 |
| SMILES | C1=CC=C2C(=C1)C(OS2(=O)=O) (C3=CC=C(C=C3)O)C4=CC=C(C=C4)[O-].[Na+] |