First, tea is different.
1, black tea
Black tea is a kind of fully fermented tea, which is refined through a series of technological processes such as withering, rolling (cutting), fermentation and drying.
2. Green tea
Green tea is a kind of tea without fermentation. It is a drink made from new leaves or buds of tea trees without fermentation, after deactivation, shaping and drying.
Second, the quality characteristics are different.
1, black tea
During the processing of black tea, a chemical reaction centered on the enzymatic oxidation of tea polyphenols took place, and the chemical components in fresh leaves changed greatly. Tea polyphenols decreased by more than 90%, resulting in new components such as theaflavins and thearubigins. Compared with fresh leaves, the aroma substances increased obviously. Therefore, black tea has the characteristics of black tea, red soup, red leaves and glycol.
2. Green tea
Green tea belongs to non-fermented tea, because of its characteristics, it retains more natural substances in fresh leaves. Among them, tea polyphenols and caffeine retain more than 85% of fresh leaves and about 50% of chlorophyll, and the loss of vitamins is less, thus forming the characteristics of green tea, such as clear soup color, green leaves color and strong taste convergence. It has special effects on anti-aging, cancer prevention, sterilization and anti-inflammation, which is beyond the reach of fermented tea.
Third, the value and efficacy are different.
1, black tea
Black tea can help digestion, stimulate appetite, induce diuresis, eliminate edema and strengthen heart function. Flavonoids rich in black tea can scavenge free radicals and have anti-acidification effect. However, people with mental weakness and insomnia are not advised to drink black tea, because the refreshing effect of black tea will aggravate insomnia symptoms.
2. Green tea
Green tea contains biochemical components closely related to human health, including tea polyphenols, caffeine, lipopolysaccharide and theanine. It not only has the functions of refreshing brain, clearing away heat and relieving summer-heat, resolving phlegm, relieving fatigue and losing weight, clearing away heart-fire, relieving hangover, quenching thirst and reducing fire, and improving eyesight, but also has certain pharmacological effects on modern diseases such as radiation sickness and cardiovascular and cerebrovascular diseases. However, people with cold stomach should not drink too much, which will cause gastrointestinal discomfort.
Baidu encyclopedia-black tea
Baidu encyclopedia-green tea