Analysis of active pharmaceutical

V. ANALYSIS OF ACTIVE PHARMACEUTICAL INGREDIENTS AND DRUG PRODUCTS... 

In Structural analysis of active pharmaceutical ingredients, crystal polymorphism is an important subject of study. Crystal structures are determined by X-ray diffraction studies. Once the correlation between crystal polymorphs and their infrared spectra has been established, it can then become a relatively easy task to distinguish polymorphs by measuring their microphotographs and corresponding microscopic infrared spectra, as infrared microspectrometric measurements can be conveniently performed within a much shorter time than X-diffraction analysis. 

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