the content of
caffeine in 6 Ethiopian black and green tea leaves and 5 different black tea leaves from South Africa,
Kenya, 2 India, Zimbabwe, and Sri Lanka green teas, were analyzed at 30°C. Four Ethiopian tea samples
were also analyzed at the boiling temperature using smaller extraction time. The result of the
experiment at both temperatures indicates that, the caffeine content of Ethiopian green tea leaves is
greatest of all the Ethiopian teas while black lion tea has the least. Of all the samples tested, Kenyan
black tea had the highest caffeine content and Sri Lankan green teas had the least caffeine. The result
also indicates that, caffeine can be extracted more at the boiling temperature than at 30°C. Furthermore,
the absorption range of cinnamon tea was greater than the others by 16 nm.