Answer: The tea soup will turn yellow if left for a long time. The most important reason is that the theanine in the soup color is further oxidized by the air, and the color becomes heavier. It is the oxidation of theanine in tea soup in the air, producing yellow-red and light brown oxidation products, mainly theaflavins, theaflavins, and theaflavins. If the tea soup produces water quickly, even if the release amount of tea polyphenols and caffeine is greater than theanine, due to the fast water production, the boiling water is connected with the tea soup...
Question: Why do tea leaves turn yellow when soaked in water for a long time?
Answer: The tea soup will turn yellow if left for a long time. The most important reason is that the theanine in the soup color is further oxidized by the air, and the color becomes heavier.
Making tea with boiling water is the correct way to open it. After boiling, put the prepared tea leaves into it, let the tea leaves and water boil together for 1 minute, then turn off the heat and heat it with the residual temperature for about 2 minutes before drinking. The tea soup brewed with boiling water will not be too bitter and can withstand cooking, so it is generally drinkable.
A cup of clear and emerald green tea soup, especially if it is left under high temperature conditions for a long time, will lose its emerald green color and increase its light yellow color.
If the tea soup produces water quickly, even if the release amount of tea polyphenols and caffeine is greater than that of theanine, the contact time between the boiling water and the tea will be very short due to the rapid water production. In such a short period of time, the amounts of tea polyphenols and caffeine released are different. Not big.
It is the oxidation of theanine in tea soup in the air, producing yellow-red and light brown oxidation products, mainly theaflavins, theaflavins, and theaflavins.