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An Investigation on which tea contains the least amount of caffeine.

Ng Wei Han Ryan, Oo Kai Cheng , Chua Chester, Luke Alexander Nair
School of Science and Technology, Singapore

Group B


Caffeine is commonly found in coffee, tea, soft drinks, chocolate, kola nuts, and certain medicines. It has many effects on the body's metabolism, including stimulating the central nervous system, making you more alert and giving you a boost of energy.  Our aim was to find out which tea contained the least amount of caffeine as some people prefer to drink tea at night but do not want to be kept awake by the caffeine in the tea. As tea is very popular among many countries and there are many people that like drinking tea, this research will benefit them as some people may want to drink tea at night before sleeping but afraid that the caffeine content in the tea might keep them awake at night. To prevent them from keeping awake at night, they might be interested in finding out which tea contains the least amount of caffeine,so that they can still enjoy tea before bed.
We steeped the tea for 4 minutes in 50 ml of boiled water. We then added tannic acid solution drop-wise to 3 ml of tea until a white precipitate appeared.We took the average of 3 tests. Our experiment of 12 different teas, gave us a range of the averages of drops, from 1 to 15.3333…We concluded that black tea contained the most amount of caffeine and organic peppermint tea contained the least amount of caffeine,while our middle range was between 3-4 drops. With our results, people will know which drinks to avoid at night if they do not want to be awake. The results of this project will help people to choose the tea with less caffeine, or according to their preference. Should they want the boost of energy that caffeine provides, they know which tea to choose

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