A Simple Method for Isolation of Caffeine from Black Tea Leaves:: Use of a Dichloromethane-Alkaline Water Mixture as an Extractant

• Tetsuo Onami ^[2] ; Hitoshi Kanazawa ^[1]
  1. [1] Fukushima University

     Fukushima University

     Japón

     
  2. [2] Department of Chemistry, Fukushima Medical College
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 73, Nº 6 (June), 1996, págs. 556-557
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • A simple procedure for the isolation of caffeine from tea leaves has been established without using hot or boiling water. A mixture of tea leaves, dichloromethane, and 0.2 M NaOH was shaken for 7 min, and the organic layer was separated. After evaporation of the organic solvent, residual crystals were purified by recrystallization to give 20-30 mg (student yield) of pure caffeine from one tea bag (2 g).