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Is Pu'er tea safe? Whether Aflatoxin Exists in Pu'er Tea Was Proven.

Posted on November 8, 2019 by Josephine
Whether Aflatoxin Exists in Pu'er Tea Was Proven.

The facts about pu erh tea is Pu'er tea cannot produce aflatoxin

This is the first reply to this debate. It is also the most straightforward and simplest answer. Why is it so certain, because Pu'er tea lacks the material conditions for the conversion from Aspergillus flavus to aflatoxin during processing and post-fermentation.

How to explain it? Aflatoxin B1 is a secondary metabolite produced by Aspergillus flavus and other parasitic Aspergillus under certain conditions. Will harm us liver health. This is a scientific concept and a scientific conclusion. This concept tells us that not all Aspergillus flavus can be converted into aflatoxins. The conversion from aflatoxin to aflatoxin requires certain conditions. So what is the condition? One is the material condition and the other is the environmental condition. Among these two conditions, material conditions are the most fundamental requirements.

The production of aflatoxin needs basic material produced by Aspergillus flavus. It must be mainly composed of protein, starch, and oil, such as rice, corn, flour (including pastry, biscuit, bread, etc.,), edible oil, peanuts, nuts, and dried fruits. Although Pu'er tea also has a very small amount of protein, starch, and lipids, it is too little. Even so, the little protein in Pu'er tea is hydrolyzed into amino acids during processing, and only a small amount of starch is converted into carbohydrates. The lipid substance in the anaerobic fermentation is converted into alcohol substance and becomes a kind of aroma substance, due to the multi-enzyme system. Therefore, we conclude that aflatoxin is unlikely to occur in Pu'er tea, because it lacks the material conditions for the conversion of aflatoxin. And the condition is the most basic foundation. All teas are impossible to produce aflatoxin in subsequent aging.

The World Health Organization has issued warnings against a variety of foods that may cause aflatoxin contamination from 1993 to 1995. However, there is no similar warning to tea. Some people hold the view that Pu'er tea is a regional product, which is not focused on the World Health Organization. But what about black tea? This kind of tea is worldwide. Although black tea and Pu'er tea have some differences in the methods of fermentation, it is undeniable that they belong to the same category of fermented tea. And they can detect Aspergillus flavus in the process of fermentation, but can not detect aflatoxin. We reckon that tea is a low-calorie drink. We can not attribute the low calorie in tea to the processing technic, but the component of tea lacks the protein, starch, and oil that produces heat.

Whether Aflatoxin Exists in Pu'er Tea Was Proven.

The aflatoxin detected in Pu'er tea is derived from secondary pollution.

It is impossible to produce aflatoxin in Pu'er tea, why is the report on the status of various biotoxins pollution in Pu'er tea in the Guangzhou tea market disclosed that aflatoxin was detected in Pu'er tea? Is this report wrong? Are there other factors produced aflatoxin in Pu'er tea?

Firstly, I studied this report carefully and thought that it was authentic. The standard samples, experimental equipment, testing procedures, and conclusions used in the experiments are very standardized and rigorous. This report not only points out the data detected by aflatoxins, but also the data in the detection of fumonisins, vomiting toxins, and T-2D toxins. Therefore, I believe the authenticity and scientific nature of this report, including its academic value that cannot be questioned.

Secondly, in the summary, this report made a clear reminder that all the samples were taken from "Pu'er tea stored in wet storage in Guangzhou tea markets". Here is a keyword wet warehouse. Many people maybe don't understand what is the wet warehouse, but anyone who has stored Pu'er tea knows that wet warehouse is a kind of radical method to accelerate the fermentation of Pu'er tea. This method is only used in Guangdong and a small number of people in Hong Kong. It is not the method of the mainstream in the storage of Pu'er tea. However, there is also a problem. There will be no aflatoxin in the wet houseware at high temperature and high humidity.

I have been done dozens of destructive experiments since 2004, placing Pu'er tea in a microbial incubator, using the method of high temperature and high humidity (more aggressive than wet warehouse), observing the activity of microorganisms and enzymes at different periods, and I don’t find toxin of Aspergillus flavus. The selected samples are Dayi, Xiaguan, Bay, Bailian, Yunhe, Langhe, Chen Sheng, Long Run and other dozens of companies. Their safety indicators are excellent. Here is a funny story.

I didn't know about Pu'er tea at first, and I mistakenly thought that there would be a lot of bacteria in this natural method of fermentation and escherichia coli in Pu'er tea must exceed the standard. However, most of the products were not detected with bacteria in dozens of tests. Other products produced in the small factory have been detected with bacteria, but they have not exceeded the standard. This has caused me great interest. Under further observation, it was found that the process of fermentation in Pu'er tea is the participation of a multi-enzyme system. When the flora is established, other bacteria included Escherichia coli are inhibited and difficult to reproduce. This is the principle of antagonism often mentioned in microbiology. (Note: Antagonism is a common phenomenon in microbiology)

Thirdly, if Pu'er tea cannot produce aflatoxin on the high temperature and high humidity in the wet warehouse, and where is the problem? The problem is still in this wet warehouse. It is secondary pollution of the wet warehouse. Anyone who has ever visited a wet warehouse has an intuitive impression that the environment in the warehouse is dirty, chaotic and harsh.

There are often some sundries in the wet warehouse that are not related to Pu'er tea, and the snack debris often scatters in the ground. Besides, there is no habit of changing clothes and changing shoes. Even if someone just brings the debris of peanuts and biscuits in the soles, the first pollution will occur. The little debris is easy to combine with Aspergillus flavus and produce secondary pollutants aflatoxin in the wet warehouse. These pollutants will be transferred to Pu'er tea. Therefore, many experts say that most of the Pu'er tea does not have aflatoxin. If Pu'er tea can produce aflatoxin, then it should not be a small amount, but exist in a space and environment. Therefore, the little aflatoxin in Pu'er tea is caused by secondary pollution. This is also the reason why the wet warehouse invented for decades has not become the mainstream in storage for Pu'er tea.

Therefore, the investigation on the status of various biotoxins pollution in Pu'er tea in the Guangzhou tea market is arousing people’s attention in the storage of Pu'er tea in wet houseware by aflatoxin detected in sampling. This is a disclosure in the problem of wet houseware with dramatization and it does not represent that all Pu'er tea is of aflatoxin. Just as the department for food inspection finds aflatoxins in individual samples from the national grain reserve every year, so the results of the tests can only be used to improve the management of the reservoir area and adjust the operation process. Aflatoxins in individual samples from food can not represent that food can not be eaten or eating food will get cancer. Therefore, the report on professionalism cannot be judged by imagination or exaggeration, drinking Pu'er tea will not endanger people health. Otherwise, it will only occur non-professional misreading.

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