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- W1885207375 abstract "Abstract We report a gas-chromatographic procedure for routine determination of the bronchodilator, theophylline (1,3-dimethylxanthine), in serum and saliva. Volatile butyl derivatives for gas chromatography were prepared by the method of Greeley [Clln. Chem. 20, 192 (1974)], with butyliodide as the alkylating agent. Substances that interfere in the classical determination of theophylline, such as theobromine (3,7-dimethylxanthine) and phenobarbital, are well separated from theophylline by the gas-chromatographic procedure and can be quantitated if desired. It is possible to determine 1 µg of theophylline in 1 ml of serum or saliva. Between-run precision for 15 µg/ml samples was 5.3%. This determination is useful in assessing patient compliance with medication instructions and in adjusting dosage schedules of theophylline in patients attending a pediatric allergy clinic." @default.
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- W1885207375 date "1975-01-01" @default.
- W1885207375 modified "2023-09-27" @default.
- W1885207375 title "Gas-Chromatographic Determination of Theophylline in Human Serum and Saliva" @default.
- W1885207375 doi "https://doi.org/10.1093/clinchem/21.1.144" @default.
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