... polyphenols, caffeine, aromatic oil, moisture, minerals, pigment, carbohydrate, protein and amino acid, vitamin etc The testing method] : by HPLC Tea ... toxicity of compounds.Catechin acts a protective effect on pigments and vitamins in the food, keeps the food to retain ... , chewing gum, diet, fat, food, medicine, cosmetics and beverages, which will have broad application prospects.Product descriotion 1 ...