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114529

Sigma-Aldrich

Phenol Red

ACS reagent

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Synonym(s):
Phenolsulfonphthalein
Empirical Formula (Hill Notation):
C19H14O5S
CAS Number:
Molecular Weight:
354.38
Beilstein/REAXYS Number:
326470
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.47

grade

ACS reagent

Quality Level

form

powder

clarity of soln

passes test

technique(s)

titration: suitable

visual transition interval

6.8-8.2, yellow to red

solubility

water: 0.77 g/L at 100 °C

λmax

360 nm
557 nm (2nd)

ε (extinction coefficient)

≥10000 at 288-294 nm in H2O
≥55000 at 555-561 nm in H2O
≥7000 at 357-363 nm in H2O

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

Oc1ccc(cc1)C2(OS(=O)(=O)c3ccccc23)c4ccc(O)cc4

InChI

1S/C19H14O5S/c20-15-9-5-13(6-10-15)19(14-7-11-16(21)12-8-14)17-3-1-2-4-18(17)25(22,23)24-19/h1-12,20-21H

InChI key

BELBBZDIHDAJOR-UHFFFAOYSA-N

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This Item
P3532P02901.07241
Phenol Red ACS reagent

114529

Phenol Red

Phenol Red powder, BioReagent, suitable for cell culture

P3532

Phenol Red

Phenol red solution 0.5%, liquid, sterile-filtered, BioReagent, suitable for cell culture

P0290

Phenol red solution

Phenol red indicator ACS

1.07241

Phenol red

technique(s)

titration: suitable

technique(s)

cell culture | mammalian: suitable

technique(s)

cell culture | mammalian: suitable

technique(s)

-

solubility

water: 0.77 g/L at 100 °C

solubility

1 M NaOH: 1 mg/mL

solubility

-

solubility

-

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing

application(s)

-

application(s)

-

form

powder

form

powder

form

liquid

form

solid

ε (extinction coefficient)

≥10000 at 288-294 nm in H2O, ≥7000 at 357-363 nm in H2O, ≥55000 at 555-561 nm in H2O

ε (extinction coefficient)

-

ε (extinction coefficient)

-

ε (extinction coefficient)

-

General description

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 that has a larger conjugated system than the yellow hydroxyquinone).

Application

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 the investigation of gastric and duodenal ulcers and 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.
Phenol Red has been used for the preparation of phenol red gavage meal for measurement of gastric emptying in rats.
Suitable for use as a pH indicator.

Biochem/physiol Actions

Phenol Red is a pH indicator which changes color from yellow to red.

pictograms

Exclamation mark

signalword

Warning

Hazard Classifications

Skin Irrit. 2 - STOT SE 3

target_organs

Respiratory system

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

dust mask type N95 (US), Eyeshields, Gloves


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