Phenolic content in tea green tea. Catechins constitute about 25% of the dry mass of a fresh tea leaf, although total catechin content varies widely depending on species, clonal variation, growing location, season, light variation, and altitude. They are present in nearly all teas made from "Camellia sinensis", including white tea, green tea, black tea and oolong tea. Of all the catechins in tea, EGCG is the main subject of scientific study with regard to its potential health effects. 4-Hydroxybenzoic acid, 3,4-dihydroxybenzoic acid (protocatechuic acid), 3-methoxy-4-hydroxy-hippuric acid and 3-methoxy-4-hydroxybenzoic acid (vanillic acid) are the main catechins metabolites found in humans after consumption of green
Chinese tea culture Chinese tea culture Chinese tea culture refers to how tea is prepared as well as the occasions when people consume tea in China. Tea culture in China differs from that in European countries like Britain and other Asian countries like Japan, Korea, Vietnam in preparation, taste, and occasion when it is consumed. Tea is still consumed regularly, both on casual and formal occasions. In addition to being a popular beverage, it is used in traditional Chinese medicine as well as in Chinese cuisine. The concept of tea culture is referred to in Chinese as "chayi" ("the art of drinking tea"),