Caffeine is one of the compounds found in coffee beans and other parts of coffee plant. However, its relative content in different coffee plant parts is least researched. Therefore, this study was designed to determine the content of caffeine in green coffee leaves and beans. In this work, we report content of caffeine in green coffee beans and leaves of coffea arabic using UV/Vis spectrometer with liquid-liquid extraction method. Results obtained indicate that the content of caffeine in green coffee beans and leaves are in the range of 9.94Â±0.08 mg/g to 11.46Â±0.12 mg/g and 2.53Â±0.07 mg/g to 2.73Â±0.09 mg/g, respectively. On top of that, the difference in percentage of caffeine content between green coffee beans and leaves is in the range of 73.44 to 77.31, with beans taking the upper hands. These results show that there is statistically significant content of caffeine in green coffee beans than its green leaves.
Keywords: Caffeine, green coffee beans, green coffee leaves, UV/Vis Spectrometer