The,Tannic,Acid,Nature,Have,yo health The Tannic Acid in Nature
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Have you ever noticed such phenomena? The mung beansbecome black after they were cooked in iron containers. The surfaces of applesand pears will be black if they are cut by iron knives. The reason of suchphenomena is that there is a substance called tannic acid in the mung beans,apples, pears and many other types of fruit. The tannic acid can combine withiron to compose a black substance when they are exposed to oxygen. Have you ever tried the taste of tannic acid? Oh, it is verydry. The dry tastes of many kinds of fruit are due to the tannic acid. Forexample, there is a large amount of tannic acid in the cells of persimmons. Onceyou have broken the cell membrane, the tannic acid comes into your mouth andmakes your tongue dry. The pure tannic acid is yellowish in color and rathersoluble. The persimmons on the market are usually dealt with limewater or drylime. It is because that lime can make the tannic acid insoluble. After suchdealing, the persimmons will not taste dry again. Heating has the same effect. Sosome people like to heat the persimmons to drive away the dry taste as well asthe bacteria. Sometime the pears and apples would also become black even if youdo not use a iron knife. It is again the oxidation of tannic acid. The drytaste of wine is also caused by this substance. No one would like the bad tasteof the tannic acid itself. But many people enjoy the dryness of wine. We knowthat dry red wine is often more expensive than sweet wine.Tannicacid is everywhere in nature. It mainly exists in barks. In Sichuanand Yunnan, China, a tree called gall tree growfruits containing rich tannic acid.There is much tannic acid in tealeaves as well. It is the tannic acid that makes strong tea do harms to ourhealth. Tea can refresh our mind and help digest. But strong tea is not goodfor health, especially for the elderly. Once you have drunk too much strongtea, the following symptoms would appear. First of all, your gastric juice isso little that you cannot digest in normal way. A healthy adult needs 1.5 to2.5 liters of gastric juice a day, which can normally deal with the properingestion of food. Once there is not enough gastric juice, you may feelbellyache and dyspepsia. Secondly, it keeps the human body from ingesting iron.The tannic acid in tea would combine with iron in the human body and even leadto anemia. Thirdly, the tannic acid can also combine with the proteins in foodand would sometimes cause coprostasis.
The,Tannic,Acid,Nature,Have,yo