Gallic acid (GA) is a kind of polyphenolic compounds in nature, and widely distributed in medicine herbs, such as Rhus Chinensis Mill., Radix Sanguisorbae, et al. GA is an important organic fine chemical material, it is mainly used to produce ink, dye and medicine, and is applied in daily chemicals, leather, food, organic synthesis, et al. The last century, products with GA as functional ingredient are popular in the international market, which greatly promoted the domestic research and development of GA. E...