[Power X-ray diffraction analysis of Chinese medicinal materials Radix Gentianae macrophyllae].

To identify Radix Gentianae Macrophyllae, eight samples were analyzed by powder X-ray diffraction method. We obtained the characteristic peaks and diffraction fuzzy figures for distinguishing Radix Gentianae Macrophyllae. The results showed that every medicine had its own character which could be well repeated. X-ray diffraction figure plays an important role in distinguishing Chinese materia medica with similar shape and properties, similar tissue texture or similar chemical composition. And X-ray diffraction figure may be used as one fingerprint method for Chinese herbal medicine.