What does gallic acid taste like?

Belongs to acid, taste is sour. Gallic acid (English: Gallic acid), also known as gallic acid or gallic acid, is an organic acid, can be found in gallnut, lacquer tree, tea and other plants. According to foreign literature, gallic acid was first made by Scheler (1786). But ancient China has been clearly recorded long before this.

In Volume 39 of Compendium of Materia Medica, there is a record that "if the cream grows on the medicine, the medicine has become a thing of the past. The "raw white" and "long cream" here all mean the formation of gallic acid, which is the earliest organic acid in the world, 200 years earlier than Scheler's discovery. Acid hydrolysis is mainly divided into one-step method and two-step method. The main process of preparing gallic acid by the two-step method is as follows: raw material → hot water extraction → filtration of filter residue → concentration of tannin aqueous solution to about 20% → acid hydrolysis → cooling crystallization → centrifugation to obtain crude product → dissolution of crude product and carbon decolorization → cooling crystallization after filtration → centrifugation → drying → gallic acid finished product.

Although the reaction filter and the freezing kettle are made of stainless steel, due to the high reaction temperature, the acid concentration is large, and the corrosion is obvious, which directly affects the service life of the equipment.