Determination of Crystal Type α in Glycine by Powder X-ray Diffraction / 中国药师

Objective: To determine the content of crystal type α in glycine by X-ray power diffraction technique to provide evi-dence for the polymorphic research. Methods: A calibration curve was established by using the characteristic peak ratio of glycine form α at 2θ=19. 1° to form γ at 2θ=25. 4° as the quantitative parameter to determine the content of crystal type α. Results: The charac-terization figures of form α and form γ were obtained. The linear range of form α was 1%-99% (r=0. 996 7), and the average recov-ery was 102. 8% with the RSD of 4. 0% (n=9). Conclusion: X-ray powder diffraction method is a feasible analytical method for the quantitative determination of form α and form γ of glycine with simple,sensitive and accurate properties.