title: [Not Available].
abstract: The three natural xanthines, caffeine, theobromine and theophylline, have been determined by HPLC on columns of silica gel or a C(18)-bonded phase. For the determination in beverages, HPLC on silica gel was used. The method was applied to coffee, tea, maté, in extracts or in the drinks themselves. For the extracts a comparison was made with other methods for determining caffeine, HPLC seems a method well suited to analysis of complex matrices for the xanthines.
authors.affiliation: Faculté de Pharmacie, Laboratoire de Chimie Analytique et Bromatologie, Domaine de la Merci, 38700 La Trouche, France.
authors.forename: M F
authors.initials: MF
authors.lastname: Vergnes
authors.forename: J
authors.initials: J
authors.lastname: Alary