Caffeine in green tea vs black tea ,which one has higher content?Ultimate Guide
Tea lovers are very curious about tea caffeine content.It is know that tea refreshing function because of containing caffeine. Teas caffeinated beverages such as green tea, black tea, oolong tea, pu'er tea and white tea all have different levels caffeine contents.
Caffeine in green tea vs black tea ,which one has higher content?
Caffeine was first discovered in 1827 as having caffeine in tea, but not exactly the same as caffeine in coffee. It is a white needle-like crystal that dissolves in hot water and tastes slightly bitter, but combined with amino acids in tea, it tastes cool.Effects of caffeine are refreshing functions, diuretic and weight loss, pain relievers etc.. Side effects of caffeine cause high blood pressure risk and central nervous system excitment to cause insomnia.
Each types tea leaves caffeine content level is difference. Caffeine content in tea depends mainly on raw materials, including variety, growth conditions, harvesting season, picking standards, processing and other factors.
Some ingredients in tea will combine with caffeine and slowly release caffeine, so it is much milder than coffee.
It also called teas "mild caffeine" or energy drinks for healthy adult.
Caffeine in tea is almost the same level in any kind of tea,even there is little varies widely in amount per cup tea.
Coffee caffeine content - 80mg (general content range 40-170mg)
Black tea Caffeine content - 40mg (general content range 25-110mg)
Oolong's caffeine content - 30mg (general content range 12-55mg)
Green tea caffeine content -20mg (general content range is 8-30mg)
White tea caffeine content -15mg (general content range is 7-25mg)
Pu'erh tea caffeine content 2mg (very low content)
Caffeine content conclusion:
From high to low: coffee>black tea > oolong tea > green tea >white tea > Pu'er tea
To refreshing, you had better drink a little more tea,but caffeine intake no more than 300-400 mg per day.
Factors affecting caffeine content in tea
Caffeine content in tea buds, stems, tea leaves, tea powder is different level.
Tea can be made from different parts of the tea plant and contain varying levels of caffeine. Younger leaves and buds contain more caffeine than old leaves and stems. Buds and younger teas leavese are known to have higher antioxidants and nutrients than older tea leaves, but few people know that caffeine is high in tea buds.
Caffeine content in fermented tea leaves
Through experiments, microbial fermentation technology was used to increase the caffeine content in tea. Their research showed that after treatment of the leaves with microorganisms for a period of time (ie, accumulation fermentation), caffeine content in the tea increased reasonably, and the increase in caffeine content in black tea and green tea varied greatly (27.57% and 86.41%). These results indicate that change in caffeine content in tea during fermentation depends not only on growth and reproduction of microorganisms, but also on composition of the tea leaves.
After tea is fermented, tea polyphenols will encapsulate caffeine. Caffeine in tea is relatively stable and will not be lost due to fermentation process. However, However, Caffeine content has not decreased.
Caffeine content in dry with temperature and time effect
Temperature and time during production process of green tea, black tea, Pu'erh tea, white tea, oolong tea, etc. is different. Baking process limite caffeine content in tea.But black tea in different tea makers for example, during drying and fragrant process with different time and temperature ,as a result. There are it is not easy to determine which type of tea has more caffeine content.
Caffeine is sublimed at a temperature of 178 ° C, and caffeine in stir fixation at a high temperature hot pan for a long time is less.Green tea during this making process will reduce caffeine quick.
Generally,stir fixation hot pan temperature for green tea and pu'erh is more than 200 ° C, and black tea is only used at the final drying prodecess with temperature of about 100 ° C, so caffeine content in black tea is higher.
Brewing tea time and temperature affect caffeine content
During brewing process requirements difference with water temperature and time for different teas, which results different caffeine content in tea soup.
When brewing the same amount of tea, higher water temperatures and longer soaking times increase amount of caffeine.
For green tea, caffeine and tea polyphenol content reached a maximum at water temperatures above 90 °C. However, if brewed at a water temperature of 60 ° C, caffeine and tea polyphenol content will only release half of total amount.
At the same water temperature, taking black tea as an example, if it is brewed for 4 minutes, it will release 40 mg to 100 mg of caffeine. If it is brewed for 3 minutes, it will release 20 mg to 40 mg of caffeine.
Caffeine dissolution rate of all teas increased with brewing water temperature increase, and caffeine content with boiling water brewing was at least double with 80 °C brewing.
This is because caffeine is more soluble in hot water, so the dissolution rate in cold tea is lower. Whether it is cold soak for 2 hours or 4 hours, the total amount of caffeine content is lower cold water. Caffeine content in first brewing shows that water temperature has a great influence on dissolution rate of caffeine. Therefore, people more sensitive to caffeine,you can choose appropriate brewing method (such as cold water soak or reduce amount of tea in first few cups) to reduce caffeine intake.