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Bromocresol Purple Powder
Bromocresol Purple Powder’s various roles as a pH indicator, colistin resistance agent, serum albumin quantifier, and environmental analysis tool.
Catalog Number: ASC-1013
CAS Number: 115-40-2
MW: 540.24 gr/mol
MF: C21H16Br2O5S
Bromocresol Purple is a biological stain used in microbial culture media as pH indicator. The distinct purple to yellow color shift helps to monitor pH changes.
This dye has colistin resistance property because of its ability to bind to lipopolysaccharide thus preventing colistin binding.
Bromocresol Purple Powder is used in clinical laboratories to assess serum albumin levels. Its capacity to change color in response to protein binding allowing the precise measurement of albumin in blood serum, aiding in medical diagnosis and monitoring.
| Cat. Number | ASC-1013 |
| CAS Number | 115-40-2 |
| MDL Number | MFCD00011681 |
| Pubchem | 310268868 |
| Molecular Weight | 540.24 gr/mol |
| Molecular Formula | C21H16Br2O5S |
| Storage Temperature | 20 °C |
| Form and Color | Powder / Grey to purple, pink or yellow-brown |
| Solution Appearance (0.1 % in ethanol) | Clear, Yellow |
| Solubility | Soluble in ethanol (80 mg/ml), alcohol, methanol (4 mg/ml), methyl cellosolve (300 mg/ml), dilute alkalies. Insoluble in water. |
| Purity | ≥ 95 % |
| pH Transition Range | 5.2 (Greenish-yellow) – 6.8 (Purple-blue) |
| Wavelength of Maximum Absorption | λ max1: ̴ 431.0nm / λ max2: ̴ 589.0nm |
| Absorptivity (1%/1cm) | 400 – 450 (pH 5.2 at λ max1) / 1000 – 1100 (pH 6.8 at λ max2) |
| Synonym | 5,5’-Dibromo-o-cresolsulfonphthalein; Bromocresol Purple sultone form |
