1.07241
Phenol red
pH indicator, ACS
Synonym(s):
Phenol red
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About This Item
Linear Formula:
(C6H4OH)2C7H4SO3
CAS Number:
Molecular Weight:
354.38
UNSPSC Code:
12171502
EC Index Number:
205-609-7
NACRES:
NA.21
MDL number:
Product Name
Phenol red, indicator ACS
Quality Segment
grade
ACS reagent
form
solid
loss
≤1% loss on drying, 110°C
visual transition interval
1.2-3.0, brown-orange to yellow(1st transition range), 6.5-8.0, brownish-yellow to red-violet(2nd transition range)
mp
>300 °C
bulk density
200‑300 kg/m3
storage temp.
2-30°C
SMILES string
[S]1(=O)(=O)OC(c4c1cccc4)(c3ccc(cc3)O)c2ccc(cc2)O
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
General description
Phenol red (phenolsulfonphthalein, PH R) belongs to the class of triphenylmethane dyes. It is a waterͰsoluble anionic dye, mostly used as a pH indicator in cell biology laboratories. Also, in different protocols, it is used to detect H2O2(Hydrogen peroxide).
Application
Phenol red can be used as a:
- Dye in the preparation of phenol red/n-Si photodiode [phenol red/n-type silicon wafer] by spin coating technique. The device is appropriate for photo-detection applications.
- Color-changing dye in the design of fiber optic pH sensor because as the acidity increases, the dye′s absorption properties shift from the green to the blue section of the spectrum.
- Indicator in the determination of freshwater pH.
Features and Benefits
Phenol red is used to detect pH changes in cell culture,
- pH is 6.4 or below yellow color
- pH is 8.2 or above red color.
Analysis Note
Appearance of solution: passes test
1st transition range: pH 1.2 - pH 3.0brownish orange - yellow
2nd transition range: pH 6.5 - pH 8.0brownish yellow - red violet
Loss on drying (110 °C): ≤ 1
Transition range (according to ACS): passes test
ACS conforms
1st transition range: pH 1.2 - pH 3.0brownish orange - yellow
2nd transition range: pH 6.5 - pH 8.0brownish yellow - red violet
Loss on drying (110 °C): ≤ 1
Transition range (according to ACS): passes test
ACS conforms
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Signal Word
Danger
Hazard Codes
Precautionary Statements
Hazard Classifications
Acute Tox. 1 Oral - Eye Irrit. 2
Storage Class
6.1A - Combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials
Flash Point (°F)
Not applicable
Flash Point (°C)
Not applicable
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