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Introductions: Green tea extracts are herbal derivatives from green tea leaves ( Camellia sinensis ). Containing antioxidant ingredients – mainly green tea catechins (GTC) – green tea and its derivatives are sought-after amongst people who pursue health. The cardinal antioxidative ingredient in the green tea extract is green tea catechins (GTC), which comprise four major epicatechin derivatives; namely, epicatechin (EC), epigallocatechin (EGC), epicatechin gallate (ECG), and epigallocatechin gallate (EGCG). Other components include three kinds of flavonoids , known as kaempferol , Quercetin , and myricetin [3]. A remarkably higher content of myricetin is detected in tea and its extracts than in many other plants, and this high concentration of myricetin may have some implications with the bioactivity of tea and its extracts The biochemical properties of green tea extracts can be generally divided into four aspects – antioxidant , anticarcinogen , anti-inflammatory , and anti-radiation Green tea extracts exhibit stronger antioxidant protection for human body than vitamin C and vitamin E . Scavenging effect of lipid free-radicals (one antioxidant property) of polyphenols in green tea extracts can be clearly observed in experiments [7:125]. The ability of GTP in green tea extracts to eliminate lipid-derived free radicals is noticeably stronger (almost 50 times) than that of ginkgo biloba extracts. Moreover, the anticarcinogenic property make the green tea extracts a hotspot in recent scientific researches. In many experiments, green tea extracts show inhibitory effects on cancer cells. In addition, green tea extracts also contain a wide-ranged anti-inflammatory characteristics, so it may be helpful in treating chronic inflammatory states. Constituents:
Biochemical properties: