Crystalline form of chlorogenic acid and preparation method thereof

Abstract

Provided is a crystalline form of chlorogenic acid. The crystalline form is an orthorhombic crystal system, the space group is P212121, the cell parameters are a=7.7291 (2) Å, b=10.9808 (2) Å, and c=3.5334 (7) Å, α=β=γ=90.00°, Z=8, and the cell volume is 3100.65 (11) Å3. Also provided is a preparation method for the crystalline form. The present crystalline form has good stability and does not significantly change during storage for 48 months in a cool, dark place, and the various indices all meet the relevant requirements for active pharmaceutical ingredients. The crystallization process provided by the present invention can not only use raw materials having different purities to prepare the same crystalline form of chlorogenic acid, but can also significantly reduce solvent residue in the raw materials, thereby improving product safety.

Dependencies are inferred from the claim text.