Phenol red, powder, Bioreagent cell culture reagent, Sigma-Aldrich®
Supplier: SIGMA ALDRICH MICROSCOPY
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Warning
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M-Clarity™ quality level = MQ200
Phenol Red is a phenolsulfonphthalein compound. It is present as a sulfonated hydroxyquinone in weakly acidic aqueous solutions. In alkaline solutions, the dye forms a hydrophilic dianion (a small, red anion and has a larger conjugated system than the yellow hydroxyquinone).
Phenol red is commonly used as a pH indicator in biology and medicine. It is incorporated into microbiological culture media for the identification of Escherichia coli strains. Its clinical diagnostic applications include investigation of gastric and duodenal ulcers and in the assessment of tear function in ophthalmology. Phenol red is also used as a tracer to assess the permeability of the ileal mucosal membrane and to assess bacterial leakage through root-filling materials in dentistry. Suitable for use as a pH indicator.
Formula:
C₁₉H₁₄O₅S Melting Pt: >300 °C Storage Temperature: Room Temperature |
MDL Number:
MFCD00003552 CAS Number: 143-74-8 EINECS: 205-609-7 Merck Index: 13,07329 |
Specification Test Results
Appearance (Colour) | Dark Red to Dark Brown |
Appearance (Form) | Powder |
Solubility (Colour) 100 mg plus 100 ml 1 N NaOH |
Dark Red |
Infrared spectrum | Conforms to Structure |
pH 6.8 (yellow), 8.2 (red) |
Conforms |
Cell Culture Test | Pass |
Recommended Retest Period | 3 years |
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