Protocatechuic acid is widely found in commonly used Chinese herbal medicines such as Eleutherococcus senticulosus, Aceton, and Bitter Leaf Beads, and is a water-soluble phenolic acid component.
| Alias | 3,4-Dihydroxybenzoic acid |
| English name | Protocatechuic Acid |
| Molecular formula | C7H6O4 |
| Structural formula |
 |
| CAS number | 99-50-3 |
| Molecular weight | 154.12 |
| Appearance | White to off-white crystalline powder |
| Solubility | Soluble in hot water, ethanol and ether, slightly soluble in cold water, insoluble in benzene |
| Preservation method | Store at room temperature, sealed, dry and protected from light |
| Content | ≥98% |
| Purity | ≥99% |
| Shelf life | 24 months |
It has a variety of biological activities and can be used as dyes, pharmaceutical intermediates, and analytical reagents.
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