thymolphthalein


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thymolphthalein

[¦thī‚mȯl¦thā‚lēn]
(organic chemistry)
C6H4COOC[C6H2(CH3)(OH)CH(CH3)2]2 A white powder insoluble in water, soluble in alcohol and acetone, melts at 245°C; used in medicine and as an acid-base titration indicator.
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Immediately, after the solution was cooked, 6-10 drops of 1% thymolphthalein indicator were added and the solution was immediately titrated with 0.1 N sodium hydroxide to the thymolphthalein endpoint [10].
The following Hammett indicators were utilized: phenolphthalein ([H.sub.-] = 8.2), thymolphthalein ([H.sub.-] = 10.0), 2,4-dinitroaniline ([H.sub.-] = 15.0), and 4-nitroaniline ([H.sub.-] = 18.4).
Rapid method for determination of alkaline phosphatase activity in human serum with thymolphthalein monophosphate.
The solution was then cooled to room temperature and titrated using thymolphthalein as the indicator until a persistent color change was obtained.
The alkaline phosphatase present in the sample hydrolyzes the substrate thymolphthalein monophosphate, releasing thymolphthalein and inorganic phosphate.
Maternal blood placental alkaline phosphatase (PAP) activity was assayed by the Thymolphthalein Monophosphate method (4) using the maternal sera samples heated at 65[degrees]C for 7 min.
This tendency was similar at the jejunum: 632; 1151; 749 and 405 ([micro]moles thymolphthalein /min/mg protein) and ileum: 107; 225; 157 y 71 ([micro]moles thymolphthalein/min/mg protein) with the same concentrations of phytic phosphorus.
One strategy involves using an acid-base indicator such as thymolphthalein, which has a deep blue color in an alkaline solution but is colorless in acidic conditions.
Analysis of breath tests: Expired [sup.14]C[O.sub.2] was collected through a calcium chloride column into a trapping agent consisting of 4 ml methylbenzethonium hydroxide and a pH colour indicator (thymolphthalein) [20].