phthalein

American  

[thal-een, -ee-in, fthal-] / ˈθæl in, -i ɪn, ˈfθæl- /

noun

Chemistry.

1. any of a group of compounds formed by treating phthalic anhydride with phenols, from which certain important dyes are derived.

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phthalein British  

/ ˈθæl-, ˈfθæl-, -lɪɪn, ˈθeɪliːn /

noun

1. any of a class of organic compounds obtained by the reaction of phthalic anhydride with a phenol and used in dyes

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phthalein Scientific  

/ thăl′ēn′,thā′lēn′,fthăl′- /

1. Any of a group of chemical compounds formed by a reaction of phthalic anhydride with a phenol. They are used to derive certain synthetic dyes.

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Etymology

Origin of phthalein

First recorded in 1900–05; (na)phthale(ne) + -in ²

Example Sentences

The phthalein excretion is normal or only slightly reduced.

From Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. by Warfield, Louis Marshall

When these patients are seen with acute cardiac decompensation, there are, of course, much albumin and many casts in the urine, and the phthalein output is, for the time being, decreased.

From Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. by Warfield, Louis Marshall

As the case advances the phthalein output becomes less and less, until a period is reached when there are only traces or complete suppression at the end of a two-hour period.

From Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. by Warfield, Louis Marshall

Some clinicians use indigo-carmine in place of phthalein.

From Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. by Warfield, Louis Marshall

A similar demonstration may be made by allowing drops of acid to diffuse through solutions of gelatine made slightly alkaline and coloured with phenol phthalein.

From The Mechanism of Life by Leduc, Stéphane