• HOME >
  • Tea constituents and functional effect

Is it true that pu-erh tea contains less caffeine?

[2017.01.22] Posted By

k566-1
I often came across with lots of internet media which explain that pu-erh tea contains less caffeine. Is that really true? I studied various science literatures to find out the truth.

Wrongly believed fact that ripe pu-erh tea contains lower caffeine

There are two types of pu-erh tea, raw pu-erh tea and ripe pu-erh tea. In the heart of tea production zone in Yunnan, people naturally refer to the raw pu-erh when they mention pu-erh tea. The raw pu-erh tea has about 800 years of history. As for ripe pu-erh tea, it was a newly invented tea product in 1970s. The ripe pu-erh tea was made by microbiological fermentation with refer to the production method of compost. The raw pu-erh tea in fact is one kind of green tea. The difference in process between green tea and raw pu-erh tea is only about the drying method. The green tea is dried with hot air, while the raw pu-erh tea is dried under the sunshine. The rest of the process is about the same.

IMG_8141

The color of raw pu-erh tea looks similar to green tea

Confirming the variation of caffeine during microbiological fermentation of ripe pu-erh tea

Jia-Hua Li, Japanese Society of Agricultural Technology Management 15(2) : 73-79, 2008(Japanese)showed the changes of caffeine content during the fermentation of ripe pu-erh tea. The Y is the concentration and the X is the duration of fermentation. CAF is the caffeine content.

スクリーンショット 2017-01-19 13.41.49

The data shows that caffeine content increased following the process. It could be due to the losses of some volatile substances during fermentation. The total weight of tea might have decreased. Eventually, the relative ratio of caffeine might have increased. Most importantly, it shows that caffeine is not decreasing by the fermentation.
Yuegang Zhou, Hao Chen, Yiwei Deng, Talanta 57 (2002) 307-316 carried out a quantitative analysis of caffeine using HPLC. In this literature, they compared between teas with various quality and plucking timing. So I cannot take it as a perfect reference. Nonetheless, the level of caffeine in ripe pu-erh tea is more or less the same as other tea.

スクリーンショット 2017-01-19 13.36.55

Based on the above data, the caffeine content in ripe pu-erh tea is not really decreasing even after the microbiological fermentation. It seems caffeine is a very stable substance. We concluded that caffeine content in pu-erh tea is as much as other teas. It is known that the caffeine content decreases if tea is plucked later in season. It means the later the tea is plucked, the lower the caffeine content. It could be the reason why Fujian oolong in the above table contains very low caffeine. Fujian oolong such as Wuyi oolong or Anxi Tie Guan Yin is plucked very late. Normally these teas are harvested when tealeaf is grown and the substances are well-matured.

Different quality of tea may contain different level of caffeine

In fact, caffeine is the substance that gives bitter taste. Usually, the lower quality the pu-erh tea is, the more it gives bitter taste, while the quality pu-erh tea gives very least bitterness. The bitterness of tea is in inverse proportion to the aftertaste. The better the quality the tea is, the longer lasting the aftertaste it has.
The lower quality tea means it is produced by mass production style. In order to cater for the mass production output, tea is grown with lots of nitrogen fertilizer. The quality of tea becomes better if it grows slowly. Naturally the tea grown without fertilizer grows very slowly and it gives very long lasting aftertaste. In a way, the bitterness of tea is determined by fertilizer. The interesting fact is caffeine is the substance that contains four nitrogen in its molecule. To me it looks like the nitrogen fertilizer has anything to do with the formation of caffeine. In other word, if you look for the tea that originally contains lower caffeine, we believe naturally-farmed tea (tea without fertilizer) should be the one. Nevertheless, this is merely my hypothesis since I do not have research data with me yet.

Related Articles

How to get the latest update on HOJO Tea?

1. Follow Twitter, 2. Click "Like" on Facebook, and 3. Subscribe in newsletter. You can have the latest tea news from HOJO Tea.

Subscribe the Newsletter to enjoy the privileges
You may receive a free sample upon purchase, or you may have the priority to purchase special products. So please remember to subscribe our newsletter as well as the social network.
  •                 

HOJO TEA Online Shop NEWSlist

Da Cha Lin Raw Pu-erh Tea 2019 is available in our store
We have released two types of unique raw pu-erh tea, Da Cha Lin Raw Pu-erh Tea and Da Cha Lin Purple Tea. Da Cha Lin means the forest of huge tea tree. Literally, Da Cha Lin is made from huge ancient tea trees which supposed to be processed for single tree tea. It gives outstandingly …
Limited Release of Special Taiwan Oolong Tea
In 2019, we bought three types of special Taiwan oolong tea in addition to our standard line-ups. These teas are the limited tea since we may not be able to get the same quality tea every year. Introducing the unique tea as a special grade Every year we visit Taiwan and conduct tea tasting to …

NEW ARTICLES

Da Cha Lin Raw Pu-erh Tea 2019 is available in our store
We have released two types of unique raw pu-erh tea, Da Cha Lin Raw Pu-erh Tea and Da Cha Lin Purple Tea. Da Cha Lin means the forest of huge tea tree. Literally, Da Cha Lin is made from huge ancient tea trees which supposed to be processed for single tree tea. It gives outstandingly …
Limited Release of Special Taiwan Oolong Tea
In 2019, we bought three types of special Taiwan oolong tea in addition to our standard line-ups. These teas are the limited tea since we may not be able to get the same quality tea every year. Introducing the unique tea as a special grade Every year we visit Taiwan and conduct tea tasting to …
New Release of Bai Yan Shan High Mountain Raw Pu-erh Tea
We released Bai Yan Shan High Mountain Raw Pu-erh Tea. This tea was produced from tea garden located at about 2300m. The garden has gone completely wild since it has left unattended for decades. Tea garden that altitude is at 2300m In Chinese, Bai Yan Shan means White Rock Mountain. It is located in the …
Limited Release of Single Tree Purple Tea
Now Single Tree Raw Pu-erh Tea of Purple Tea is available in both Japan and Malaysia. In China, single tree is called Dan Zhu. It means tea is distinctively made from one particular tea tree. Since the old tree of purple tea is very limited, we have only very limited stock. The old Tree of …
Tang Jia Raw Pu-erh Tea 2019 is Now Available
Tang Jia Raw Pu-erh Tea is made from the spring tea grown in the west Lincang, at the altitude of 2000 to 2100m. Tang Jia means Tang Family in Chinese. This name comes from the family who owns the tea garden. Tang Jia tea garden is ancient tea garden with a vast number of huge …
The Real Cause of Astringency in Tea
Many people might think that astringency in tea comes from tannin. The fact is tannin only contributed partially to the astringency. There are two types of root cause of astringency. Besides tannin, the astringency comes from minerals too. Difference between tannin and poly phenol Summer or autumn tea is normally astringent. If you drink those …
Very Rare Tea, Jasmine Wild White Tea Bud is Available!
We released Jasmine Wild White Tea Bud (茉莉野生白芽茶). This is the original tea of HOJO. We made this new tea in 2019. I believe this is the only tea in the world. We made the new tea in the world In our line-up, we have one type of white tea called Wild White Tea Bud. …
Ming Feng Shan Raw Pu-erh Tea 2019 is now available
Ming Feng Shan Raw Pu-erh Tea 2019 鳴鳳山古樹生茶 2019 is available now in our store both in Japan and Malaysia. The Ming Feng Shan is the name of the mountain located in the west of Lincang. In Ming Feng Shan, we particularly selected the feral garden (2100m) that is left in the wild for a …

PAGETOP