CHEBI:31991 - phenol red

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ChEBI Name phenol red
ChEBI ID CHEBI:31991
Definition 3H-2,1-Benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 4-hydroxyphenyl groups. A pH indicator changing colour from yellow below pH 6.8 to bright pink above pH 8.2, it is commonly used as an indicator in cell cultures and in home swimming pool test kits. It is also used in the (now infrequently performed) phenolsulfonphthalein (PSP) test for estimation of overall blood flow through the kidney.
Stars This entity has been manually annotated by the ChEBI Team.
Supplier Information
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Roles Classification
Application(s): two-colour indicator
A colour indicator that possesses a different colour on each side of the transition interval.
acid-base indicator
An acid or base which exhibits a colour change on neutralization by the basic or acidic titrant at or near the equivalence point of a titration.
diagnostic agent
A substance administered to aid diagnosis of a disease.
Related Structures
phenol red is a Structural Derivative of
arenesulfonic acid
Definition : Organic derivatives of sulfonic acid in which the sulfo group is linked directly to carbon of an aryl group.
 organosulfonic acid
Mass : 81.07100
Formula : HO3SR
33551 		oxoacid
Definition : A compound which contains oxygen, at least one other element, and at least one hydrogen bound to oxygen, and which produces a conjugate base by loss of positive hydrogen ion(s) (hydrons).
 sulfonic acid
Mass : 82.08008
Formula : H2O3S
29214
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