[On the determination of coffeine in soft drinks and coffeine-containing food preparations (author's transl)].

The recently proposed spectroscopical determination of coffeine in soft drinks after filtration of polyamide leads to higher coffeine values than originally present, due to substances absorbed by the UV light. Therefore a method is proposed for identification and quantitative determination of coffeine in soft drinks and in methanol extracts of coffeine-containing foods by column chromatography on silical gel.