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Preparation and characterization of Forms A and B of benazepril hydrochloride / 浙江大学学报·医学版
Journal of Zhejiang University. Medical sciences ; (6): 639-646, 2012.
Article in Chinese | WPRIM | ID: wpr-336741
ABSTRACT
<p><b>OBJECTIVE</b>To prepare Form A and Form B of benazepril hydrochloride and to compare the differences in spectrums, thermodynamics and crystal structure between two polymorphic forms.</p><p><b>METHODS</b>Form A and Form B of benazepril hydrochloride were characterized by Fourier transform infrared spectroscopy (IR), thermal gravimetric analysis (TG), differential scanning calorimetry (DSC), powder x-ray diffraction (PXRD) and single crystal x-ray diffraction (SCXRD).</p><p><b>RESULTS</b>Preparation method, crystal structure and polymorphic stability of Form A and Form B of benazepril hydrochloride were obtained. Based on the analysis of crystal structure of both polymorphs, Form A belonged to monoclone space group P2(1) with a=7.8655(4)Å, b= 11.7700(6)Å, c= 13.5560(7)Å, β= 102.9470(10)°, V=1223.07 (11)Å(3) and Z=2, while Form B belonged to orthorhombic space group P212121, with a=7.9353(8)Å, b=11.6654(11)Å, c=26.6453(16)Å, V=2466.5(4)Å(3) and Z=4. From the DSC and XRD results, Form B of benazepril hydrochloride could be transformed into Form A after heating treatment.</p><p><b>CONCLUSION</b>Form A and Form B of benazepril hydrochloride are both anhydrous and displayed different polymorphs due to different molecular configuration. Furthermore, Form A exhibits more stable than Form B at high temperatures.</p>
Subject(s)
Full text: Available Index: WPRIM (Western Pacific) Main subject: Benzazepines / Chemistry / Crystallization / Drug Stability / Molecular Conformation Language: Chinese Journal: Journal of Zhejiang University. Medical sciences Year: 2012 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Benzazepines / Chemistry / Crystallization / Drug Stability / Molecular Conformation Language: Chinese Journal: Journal of Zhejiang University. Medical sciences Year: 2012 Type: Article