Determination of Caffeine in Small Plasma Samples by Gas-Liquid Chromatography with Thin-Layer Chromatographic Sample Clean-Up
作者:
Abram Hulshoff,
期刊:
Analytical Letters
(Taylor Available online 1979)
卷期:
Volume 12,
issue 14
页码: 1423-1433
ISSN:0003-2719
年代: 1979
DOI:10.1080/00032717908082543
出版商: Taylor & Francis Group
关键词: Caffeine;plasma;gas-liquid chromatography
数据来源: Taylor
摘要:
A sensitive method for the determination of caffeine in small plasma samples (50 μ1) is described. The samples are extracted with chloroform and the extrects are freed from interfering compounds by thin-layer chronatography. The spots of caffeine and the internal standard, 7-ethyl theophylline, are scraped off the plates and both compounds are eluted from the scrapings by means of a glass capillary collector. The caffeine in the eluate is quantitated by gas-
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