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
Economy of Assam tea. Assam produces some of the finest and most expensive teas in the world. Other than the Chinese tea variety "Camellia sinensis", Assam is the only region in the world that has its own variety of tea, called "Camellia assamica". Assam tea is grown at elevations near sea level, giving it a malty sweetness and an earthy flavor, as opposed to the more floral aroma of highland (e.g. Darjeeling, Taiwanese) teas. Assam also accounts for fair share of India’s production of rice, rapeseed, mustard, jute, potato, sweet potato, banana, papaya, areca nut and turmeric. Assam is also a home of