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P4758

Sigma-Aldrich

Phenol Red sodium salt

pH indicator dye

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Synonym(s):
Phenolsulfonephthalein sodium salt
Empirical Formula (Hill Notation):
C19H13NaO5S
CAS Number:
34487-61-1
Molecular Weight:
376.36
Beilstein:
6260026
EC Number:
252-057-8
MDL number:
MFCD00066901
PubChem Substance ID:
24898497
NACRES:
NA.47

Quality Level

200

form

powder

technique(s)

titration: suitable

color

red to brown

visual transition interval

6.8-8.2, yellow to red

mp

285 °C (dec.) (lit.)

solubility

water: 1 mg/mL, opaque, dark red

εmax

31.62 at 423 nm in 0.1 M phosphate buffer

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

[Na+].Oc1ccc(cc1)C2(OS(=O)(=O)c3ccccc23)c4ccc([O-])cc4

InChI

1S/C19H14O5S.Na/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;/q;+1/p-1

InChI key

HKHYOKBQJILTEI-UHFFFAOYSA-M

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General description

Phenol Red sodium salt is widely used as a pH indicator. At a pH of 6.4 and below, phenol red solution will have a yellow color. At a pH of 8.2 and above, it will have a red color. It is commonly used in culture media to detect neutral to acidic pH changes.

Application

Phenol Red sodium salt has been used as an indicator during single-guide RNA microinjection into one-cell stage zebrafish embryos.
Suitable for use as a pH indicator.

Pictograms

Exclamation mark
GHS07

Signal Word

Warning

Hazard Statements

H315 - H335

Hazard Classifications

Skin Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Scientific Reports, 6 (2016)
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Koneman's Color Atlas and Textbook of Diagnostic Microbiology (2006)
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