Phenol red also referred to as Phenolsulfonphthalein (PSP), is a 3H-2,1-Benzoxathiole 1,1-dioxide analogue. It shows yellow color below pH of 6.8 and bright pink (fuchsia) color above pH of 8.2 and is thus useful as a pH indicator. It has a role as a two-colour indicator, an acid-base indicator and a diagnostic agent.
|Name of Product||Phenol Red|
|Synonyms||Phenolsulfonphthalein; Sulfonphthal; Sulphental; Sulphonthal; Phenolred|
|Molecular Weight||354.4 g/mol|
|1||Appearance (form)||Solid Powder|
|2||Appearance (color)||Dark Red to Dark Brown|
|4||Solubility|| 0.77 g/L (In water)
2.9 g/L (In ethanol)
|5||Melting Point||>300° C|
|6||Density||~1.5 g/cm3 (Predicted)|
|7||Dissociation Constant (pKa)||8.0|
|8||Loss on Drying (at 110°Cr)||NMT 5.0 %|
Q. What does Phenol red indicate?
Phenol red is used to identify pH changes from neutral (red) to acidic (yellow) values in culture media.
Q. Is Phenol red acidic or basic?
The phenol red dye indicator is a weak organic acid.
Q. Is Phenol red toxic?
No significant toxic effects have been reported from the use of Phenol red; however, sufficient research has not been conducted on this subject.
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