Water-soluble components in tea, such as tannic acid (GA), free catechin C, (-)EC, (-)EGC, etc., are dissolved in cold water at 100℃ for two hours or twice as much as that dissolved in water for five minutes, while ester catechin (-)EGCG and (-)ECG are relatively insoluble in water.
Taicha 13 is dissolved in cold water for 4 hours, which is equivalent to water dissolving at 100℃ for 5 minutes. When caffeine is soaked in cold water for 4 hours, the dissolution rate is only 45-56% of100℃ for 5 minutes, 72-74% for 8 hours and over 85% for 24 hours. It can be seen that the dissolution rate of different kinds of tea in cold water is different. The contents of tannic acid (GA) and free catechin +/-C in canned tea drinks in the market are twice as high as those in hot water and cold water, while the contents of free catechin (-)EC, (-)EGC and ester catechin (-)EGCG and (-)ECG are obviously low, and the content of caffeine is only below 3/4. For those who want to drink tea but are worried about the stimulation of caffeine, they might as well drink it in the form of herbal tea. However, people who can't effectively soak the ingredients in tea with cold tea may have some doubts and waste some functional ingredients such as ester catechins.
Except Pu 'er, other kinds of tea can be cold soaked, such as green tea, black tea and oolong tea. ......