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Description
this is one of the most important chemicals in tea and acts as a mild stimulant. Tea leaf contains about 4% caffeine and a typical cup of tea, 40±10mg. On average, a cup of instant coffee contains ca 60 mg caffeine and one of ground roast coffee, 85 mg. A cup of coffee drunk in the evening is therefore more likely to keep you awake than a cup of tea.
caffeine is also a participant in a curious phenomenon. When a cup of black tea (without milk! ) is cooled to below ca 400c, a colloidal precipitate appears which is called 'tea cream'. This is mainly the result of weak complexation between caffeine and theaflavins and thearubigins. It has been suggested that a similar association between the milk protein casein and the various polyphenolic tea compounds could explain why milky tea is less astringent on the tongue than tea without milk.
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Tea leaf Caffeine