3,4-dihydroxybenzoic acid is a kind of organic compound that can be dissolved in hot water, ethanol, ether, and acetone. It is naturally found in fern leaves, Holly leaves, and other plants, as well as in more popular Chinese herbs, such as bitter-Orientale, Orientin, Acanthopanther, etc. Protocatechuic acid is also an organic acid. The 3,4-dihydroxybenzoic acid found on the market is usually white to brown crystalline powder that changes color when exposed to air.
Because 3,4-dihydroxybenzoic acid has A variety of biological activities, has anti-inflammatory, antibacterial, antioxidant, chemical protection, and other effects have an obvious inhibitory effect on bacteria, streptococcus A, Haemophilus influenza, and so on, the antibacterial effect of protocatechuic acid content is stronger than roxanthus. 3,4-dihydroxybenzoic acid is not only widely used in the pharmaceutical field, but also widely used in the food processing industry. It can effectively inhibit food spoilage and prevent bacterial contamination of food.