Phenol Red
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Thermo Scientific Chemicals
Phenol Red
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Catalog number B21710.09
also known as B21710-09
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Chemical Identifiers
CAS143-74-8
IUPAC Name3,3-bis(4-hydroxyphenyl)-3H-2,1λ⁶-benzoxathiole-1,1-dione
Molecular FormulaC19H14O5S
InChI KeyBELBBZDIHDAJOR-UHFFFAOYSA-N
SMILESOC1=CC=C(C=C1)C1(OS(=O)(=O)C2=CC=CC=C12)C1=CC=C(O)C=C1
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SpecificationsSpecification SheetSpecification Sheet
Appearance (Color)Red
FormPowder
Loss on Drying≤3.0% (105?C)
lambda-max (UV-Vis)555-565, 0.1% aq. sodium carbonate
Solution Test(0.1% w/v in 95% ethanol) : Clear
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Phenol red is used as a non absorbed marker in gravimetric method. It is a pH indicator used in cell biology laboratories and in home swimming pool test kits. It is used to check the kidney function based on the excreted phenol red by colorimetric method.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.

Applications
Phenol red is used as a non absorbed marker in gravimetric method. It is a pH indicator used in cell biology laboratories and in home swimming pool test kits. It is used to check the kidney function based on the excreted phenol red by colorimetric method.

Solubility
Soluble in water, ethanol and methanol. Insoluble in chloroform.

Notes
Incompatible with strong oxidizing agents.
RUO – Research Use Only

General References:

  1. Acid-base indicator: approx pH 6.8 - 8.2.
  2. Chauhan, S. S.; Jasra, R. V.; Sharma, A. L. Phenol red dye functionalized nanostructured silica films as optical filters and pH sensors. Ind. Eng. Chem. Res. 2012, 51 (31), 10381-10389.
  3. Ghaedi, M.; Daneshfar, A.; Ahmadi, A.; Momeni, M. S. Artificial neural network-genetic algorithm based optimization for the adsorption of phenol red (PR) onto gold and titanium dioxide nanoparticles loaded on activated carbon. J. Ind. Eng. Chem. 2015, 21, 587-598.