This product has only one sodium as part of the molecule - C19H13NaO5S. The sodium content is not measured as a part of the Quality Control testing.
114537
Phenol Red sodium salt
ACS reagent, Dye content 90 %
Synonym(s):
Phenolsulfonephthalein sodium salt
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5 G
$36.80
25 G
$125.00
$36.80
Estimated to ship onJanuary 26, 2026Details
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About This Item
Empirical Formula (Hill Notation):
C19H13NaO5S
CAS Number:
Molecular Weight:
376.36
UNSPSC Code:
12171500
NACRES:
NA.47
PubChem Substance ID:
EC Number:
252-057-8
Beilstein/REAXYS Number:
6260026
MDL number:
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Product Name
Phenol Red sodium salt, ACS reagent, Dye content 90 %
Quality Level
InChI key
HKHYOKBQJILTEI-UHFFFAOYSA-M
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
SMILES string
[Na+].Oc1ccc(cc1)C2(OS(=O)(=O)c3ccccc23)c4ccc([O-])cc4
grade
ACS reagent
form
powder or crystals
composition
Dye content, 90%
clarity of soln
passes test
technique(s)
titration: suitable
color
red to very dark red
visual transition interval
6.8-8.2, yellow to red
6.8-8.2, yellow to red
mp
285 °C (dec.) (lit.)
λmax
423 nm
ε (extinction coefficient)
≥19000 at 422-426 nm in methanol
≥900 at 256-269 nm in methanol
storage temp.
room temp
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Related Categories
1 of 4
This Item | 114502 | P4758 | 114421 |
|---|---|---|---|
| grade ACS reagent | grade ACS reagent | grade - | grade ACS reagent |
| technique(s) titration: suitable | technique(s) titration: suitable | technique(s) titration: suitable | technique(s) titration: suitable |
| color red to very dark red | color - | color red to brown | color - |
| form powder or crystals | form powder | form powder | form crystalline powder, powder or crystals |
| storage temp. room temp | storage temp. room temp | storage temp. room temp | storage temp. - |
| composition Dye content, 90% | composition Dye content, 95% | composition - | composition - |
Application
Phenol Red has been used for preparation of phosphate buffer saline (PBS)-with phenol red for microfluidic assay for simultaneous culture of multiple cell types.[1] It has also been used for horseradish peroxidase-phenol red (HRP-PR) H2O2 (hydrogen peroxide) detection assay to identify redox cycling compounds.[2]
Suitable for use as a pH indicator.
Biochem/physiol Actions
Phenol Red is a pH indicator which changes color from yellow to red.[3]
signalword
Warning
hcodes
Hazard Classifications
Skin Irrit. 2 - STOT SE 3
target_organs
Respiratory system
Storage Class
11 - Combustible Solids
wgk
WGK 3
ppe
dust mask type N95 (US), Eyeshields, Gloves
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Find documentation for the products that you have recently purchased in the Document Library.
Profiling the NIH Small Molecule Repository for compounds that generate H2O2 by redox cycling in reducing environments.
Soares KM, et al.
Assay and Drug Development Technologies, 8, 152-174 (2010)
TiO2 nanotube arrays of 1000 ?m length by anodization of titanium foil: phenol red diffusion.
Paulose M, et al.
The Journal of Physical Chemistry C, 111, 14992-14997 (2007)
Microfluidic assay for simultaneous culture of multiple cell types on surfaces or within hydrogels.
Shin Y, et al.
Nature Protocols, 7, 1247-1259 (2012)
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Hi there, could i know how many sodium salt in this powder? THANKS.
1 answer-
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