Determination of Caffeine in Different Commercially Available Green and Black Teas

Abstract

Methyl xanthine alkaloids caffeine, theophylline, and theobromine affect cardiovascular, nervous, respiratory, and skeletal systems. This study determined caffeine content in green and black teas from Bosnian markets using spectrophotometric UV/Vis and thin layer chromatography methods. Green tea caffeine ranged 33.90-110.73 mg/g; black tea 10.32-63.00 mg/g. Slovenian green tea and Croatian black tea showed highest caffeine levels. High consumption may cause health issues.