Lexic.us

Definition of Phthalein

1. n. One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenol phthaleïn. Their alkaline solutions are fluorescent.

Definition of Phthalein

1. Noun. (organic chemistry) any of a range of lactones formed by the reaction of phenols with phthalic anhydride ¹

¹ Source: wiktionary.com

Definition of Phthalein

1. [n -S]

Medical Definition of Phthalein

1. One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenol phthalein. Their alkaline solutions are fluorescent. Phenol phthalein, a white or yellowish white crystalline substance made from phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolourized by acids, and as this reaction is exceedingly delicate it is used as an indicator. See: Phthalic. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Phthalein

Literary usage of Phthalein

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Determination of Hydrogen Ions: An Elementary Treatise on the Hydrogen by William Mansfield Clark (1920)
"In the sulfon phthalein series the following were studied: Phenol sulfon phthalein, ... Carvacrol sulfon phthalein, Lubs and Clark. Orcinol sulfon phthalein ..."

2. Transactions of the Association of American Physicians by Association of American Physicians (1913)
"phthalein given by stomach and collected in the feces in the usual way will average 60 ... When the phthalein is added to large amounts of feces it can be ..."

3. The American Journal of the Medical Sciences by Southern Society for Clinical Investigation (U.S.) (1916)
"The Interpretation of Functional Renal Tests with Special Reference to the Significance of Minimal Excretion of phthalein and Indigo- carmin. ..."

4. Progressive Medicine by Hobart Amory Hare (1922)
"It is more than ten years ago since Rowntree demonstrated the usefulness of the phthalein tests for determining the functional capacity of the kidney in ..."

5. Introduction to Physical Chemistry by James Walker (1907)
"stronger than phenol-phthalein itself, and that the alkali should be a strong alkali. If the acid to be titrated is so feeble that its salts even with ..."

6. Journal of Nervous and Mental Disease by Philadelphia Neurological Society, American Neurological Association, Chicago Neurological Society, New York Neurological Association (1915)
"estimation of phthalein can be done with accuracy in a suitable colorimeter and the elimination in normal dogs is quite constant. ..."

7. Journal of Nervous and Mental Disease by American Neurological Association, Philadelphia Neurological Society, Chicago Neurological Society, New York Neurological Association, Boston Society of Psychiatry and Neurology (1915)
"estimation of phthalein can be done with accuracy in a suitable ... Under certain conditions of vascular interference the liver phthalein may show a ..."

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