[Caffeine determination by gelchromatography (author's transl)].

: Caffeine in beverages was determined by gel chromatography after extraction with chloroform from an alkalized sample. For extract from coffee, tea and mate a very good agreement was observed between the chromatographic method used and the method of Navellier et al. Major departures were observed for decaffeinized coffee and some beverages of the cola type, where gel chromatography was more selective and caffeine separated from impurities stripped into the extract. The reproducibility of determination corresponded to the standard method (standard deviation 4.2%).