Phenol red, powder, Bioreagent cell culture reagent, Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY
Warning

Synonyms: 3,3-Bis(4-hydroxyphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide

M-Clarity™ quality level = MQ200

P3532-25G P3532-5G
P3532-25GEA 77.4 GBP
P3532-25G P3532-5G
Phenol red, powder, Bioreagent cell culture reagent, Sigma-Aldrich®
Phenol red

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
MW: 354,38 g/mol
Melting Pt: >300 °C
Storage Temperature: Room Temperature
MDL Number: MFCD00003552
CAS Number: 143-74-8
EINECS: 205-609-7
Merck Index: 13,07329
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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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