How much caffeine is contained in various types of tea?

Almost all teas have a refreshing effect. The reason why tea has a refreshing effect is because the tea soup contains caffeine and theophylline, which produce such an effect due to the interaction.

But the content is much less than the coffee everyone drinks, and it can be said to have no harm to the body. Different types of tea and different brewing times will affect the amount of caffeine extracted from tea. The results are given below. Let’s list the caffeine content of various types of tea.

Caffeine: It is a xanthine alkaloid compound and a central nervous system stimulant that can temporarily drive away drowsiness and restore energy. It is clinically used to treat neurasthenia and coma recovery. Caffeine is also the most commonly used psychoactive drug in the world. However, excessive absorption by the body can be harmful, but the caffeine content in tea is rare, so there is no need to worry. Ingesting a large amount of caffeine can lead to irregular work and rest and lead to mental disorder; excessive caffeine intake can also cause intestinal spasm. Long-term drinking can cause chronic gastritis, stimulate kidney function, lead to polyuria in children, loss of a large amount of calcium, and affect the health of children. Bone development.

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Caffeine is extracted from tea: a cup of ordinary coffee has 3 times the caffeine content of a cup of ordinary tea; coffee: caffeine content 80mg (general content range 40-170mg); black tea: caffeine content 40mg (general content range 25 -110mg); Oolong tea: caffeine content 30mg (general content range 12-55mg); green tea: caffeine content 20mg (general content range 8-30mg); Pu 'erh tea: caffeine content 10mg (general content range 5-20mg). Under healthy conditions, the caffeine intake limit per person per day is about 400 mg. Therefore, drinking tea has only a refreshing effect on health without harm.

Of course, the brewing time will also affect the caffeine content of the tea. The longer the brewing time, the more caffeine will be extracted, and vice versa. Generally speaking, brewing black tea for four minutes will release 40 mg to 100 mg of caffeine; if it is extracted for only three minutes, only 20 mg to 40 mg of caffeine will be dissolved into the tea soup. According to standards, a 235 ml cup of green tea (equivalent to a cup of ordinary glass of boiling water) contains 30-50 mg of caffeine, a 235 ml cup of black tea contains about 47 mg of caffeine, and 235 mg of instant coffee has 62 mg of caffeine. , the caffeine content of freshly ground coffee is 95 mg.

The amount of caffeine in coffee and tea depends on a variety of factors. Generally speaking, the higher the temperature of the water, the more caffeine is released from coffee beans and tea leaves, so espresso brewed under steam pressure has a higher caffeine content than coffee brewed under normal pressure; coffee The caffeine content is also related to the brewing time. Generally, the longer the tea is brewed, the higher the caffeine content. The variety, origin, or part of the tea leaves that are picked also have an important impact on the caffeine content. The longer the tea leaves are fermented, the more caffeine they contain. Unfermented green tea has only one-third the caffeine content of fully fermented black tea. The caffeine content of semi-fermented oolong tea is only about half that of black tea. Almost all teas have a refreshing effect. The reason why tea has a refreshing effect is because the tea soup contains caffeine and theophylline, which produce such an effect due to the interaction.

But the content is much less than the coffee everyone drinks, and it can be said to have no harm to the body. Different types of tea and different brewing times will affect the amount of caffeine extracted from tea. The results are given below. Let’s list the caffeine content of various types of tea.

Caffeine: It is a xanthine alkaloid compound and a central nervous system stimulant that can temporarily drive away drowsiness and restore energy. It is clinically used to treat neurasthenia and coma recovery. Caffeine is also the most commonly used psychoactive drug in the world. However, excessive absorption by the body can be harmful, but the caffeine content in tea is rare, so there is no need to worry. Ingesting a large amount of caffeine can lead to irregular work and rest and lead to mental disorder; excessive caffeine intake can also cause intestinal spasm. Long-term drinking can cause chronic gastritis, stimulate kidney function, lead to polyuria in children, loss of a large amount of calcium, and affect the health of children. Bone development.

Caffeine is extracted from tea: a cup of ordinary coffee has 3 times the caffeine content of a cup of ordinary tea; coffee: caffeine content 80mg (general content range 40-170mg); black tea: caffeine content 40mg (general content range 25 -110mg); Oolong tea: caffeine content 30mg (general content range 12-55mg); green tea: caffeine content 20mg (general content range 8-30mg); Pu'er: caffeine content 10mg (general content range 5-20mg). Under healthy conditions, the caffeine intake limit per person per day is about 400 mg. Therefore, drinking tea has only a refreshing effect on health without harm.

Of course, the brewing time will also affect the caffeine content of the tea. The longer the brewing time, the more caffeine will be extracted, and vice versa. Generally speaking, brewing black tea for four minutes will release 40 mg to 100 mg of caffeine; if it is extracted for only three minutes, only 20 mg to 40 mg of caffeine will be dissolved into the tea soup. According to standards, a 235 ml cup of green tea (equivalent to a cup of ordinary glass of boiling water) contains 30-50 mg of caffeine, a 235 ml cup of black tea contains about 47 mg of caffeine, and 235 mg of instant coffee has 62 mg of caffeine. , the caffeine content of freshly ground coffee is 95 mg.

The amount of caffeine in coffee and tea depends on a variety of factors. Generally speaking, the higher the temperature of the water, the more caffeine is released from coffee beans and tea leaves, so espresso brewed under steam pressure has a higher caffeine content than coffee brewed under normal pressure; coffee The caffeine content is also related to the brewing time. Generally, the longer the tea is brewed, the higher the caffeine content. The variety, origin, or part of the tea leaves that are picked also have an important impact on the caffeine content. The longer the tea leaves are fermented, the more caffeine they contain. Unfermented green tea has only one-third the caffeine content of fully fermented black tea. The caffeine content of semi-fermented oolong tea is only about half that of black tea.