Many friends who go out will choose to use a thermos cup to make tea, one is to drink hot water, and then to drink tea to refresh, and those who are addicted to tea are inseparable from tea.
Can a thermos cup make green tea? Thermos cup tea is equal to "chronic suicide"?
It is best not to brew green tea in a thermos cup. The water in the thermos cup will be at a relatively high level for a long time, and the composition of green tea is more complex, containing vitamins, amino acids, carbohydrates and other substances, and the hot water soaking time is too long. These substances can be destroyed. Moreover, too high water temperature will also cause too much tannic acid and theophylline, and there will be an astringent taste when drinking.
It is not harmful to brew tea leaves in a thermos cup, but nutrients will be lost.
Some people have done experiments and shown that when making tea with a thermos cup, the tea soup will show weak acidity, but it will not corrode the thermos cup and will not lead to the precipitation of heavy metal elements. Therefore, there is no obvious harm to making tea in a thermos cup and it will not cause physical harm.
However, there is no obvious downside, and it does not mean that it is good to make tea in a thermos mug. The polyphenols contained in tea will accelerate oxidation when the water temperature remains high for a long time, and the content will fluctuate, from low to high and then decrease. Polyphenols are an important cause of the bitterness of tea, and at the same time, high temperature accelerates the oxidation of polyphenols, which will also make the tea soup yellow-brown.
If you use a glass to brew a cup of green tea, the tea soup is mostly bright and tender green and slightly yellow, but if you use a thermos cup to make a cup of green tea, most of the tea soup poured out is yellow-brown, and if it is a coarse old tea in the later stage, it even shows a yellow-red color like black tea.
In the past, large teapots and thermos were used to make tea in rural areas, and the tea soup was red and yellow, and there was not much tea fragrance, only to quench thirst. In fact, this is the result of oxidation caused by long-term simmering, resulting in the loss of nutrients in the tea. The effect of simmering in a thermos cup and making tea in a thermos bottle is similar.
If you take into account the heat preservation effect, you can brew hot tea liquid in a ceramic cup and other utensils, and pour it into a thermos cup after removing the tea leaves, so that you can drink hot tea at any time.
A material suitable for making tea
1. Ceramic cup: Because of its special material and processing technology, the ceramic cup has a stable structure and almost no harmful substances will be released during use, so the ceramic cup is the best choice for making tea, such as the famous purple clay pot is a good choice for making tea.
2. Glass: This is similar to the reason for ceramic cups, it does not contain organic chemicals in the firing process, and when people drink tea from a glass, they don't have to worry about chemicals being drunk into their stomachs. In addition, the glass surface is smooth and easy to clean, and bacteria and dirt do not easily grow on the cup wall. Therefore, drinking tea in a glass is relatively healthy and safe.
3. Enamel cups, the traditional enamel cups are made after being enamelled at a high temperature of thousands of degrees, which do not contain harmful substances such as lead, and can also be used with confidence. Therefore, to drink a cup of hot tea with a healthy and strong tea aroma, it is best to brew it with tea utensils such as ceramic cups, glasses, and enamel cups.