3,4-dihydroxybenzoic acid, also known as prozoic catechuic acid, belongs to phenolic acid, which naturally exists in a variety of fruits and vegetables, and is also an effective active ingredient in a variety of Chinese medicinal materials, such as salvia miltiorrhiza, hibhius, etc., with good water solubility, it can also be dissolved in ethanol and ether. The molecular formula of 3,4-dihydroxybenzoic acid is C7H6O4, the molecular weight is 154.12, CAS registration number is 99-50-3, melting point is about 200℃, and density is 1.54g/cm3. Storage of 3,4-dihydroxybenzoic acid is recommended in a cool, dark environment.
3,4-dihydroxybenzoic acid currently available on the market is a white to brown crystalline powder in appearance, which changes color when placed in the air, and takes on a blue-green color when encountered with an aqueous solution of ferric chloride. 3,4-dihydroxybenzoic acid can be used in medicine, health care products and other industries, it has many functions, such as antibacterial, nerve protection, antivenom and so on.