Solid State Characterizations and Analysis of Stability in Azelnidipine Polymorphs
スポンサーリンク
概要
- 論文の詳細を見る
Azelnidipine, a new dihydropyridine calcium ion antagonist, was protected by patent in Japan. In present study, identifications of the crystal phases, including two polymorphic and a pseudopolymorphic crystal forms of azelnidipine, were attempted using powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), IR-, Raman-, THz-, and ss-NMR-spectroscopy. PXRD identified three different crystal forms, while, spectroscopy analysis provided the information of crystal structure involving intermolecular interactions. The transition thermodynamics of the azelnidipine polymorphs were extensively investigated by solubility method. The solubility of the two polymorphs of α and β in 50% ethanol at 25, 31, 37, 42, and 49°C was investigated; the values obtained were used to calculate the thermodynamic parameters of the transition reaction. The temperature of polymorphic phase transition in 50% ethanol was 50.78°C, and the values of ΔGα,βθ, ΔHα,βθ, and ΔSα,βθ at 25°C were -1.18 kJ·mol-1, -14.81 kJ·mol-1, and -45.73 J·mol-1·K-1, respectively. Form β was proved to be thermodynamic stable form at room temperature and enantiotropically related with form α. The kinetics of the solid-state decomposition, studied using DSC analysis, showed that the activation energies of decomposition of the polymorphs α and β at high temperatures were 148.67 and 151.93 kJ·mol-1.
- 公益社団法人 日本薬学会の論文
著者
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Li Dong
College Of Pharmacy Yeungnam University
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Wang Jing
School Of Information Engineering Chang'an Univ.
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Wang Min
School of Pharmaceutical Sciences, Hebei Medical University
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Yang Caiqin
School of Pharmaceutical Sciences, Hebei Medical University
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Ren Guodong
College of Life Sciences, Hebei University
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Wang Jing
School of Pharmaceutical Sciences, Hebei Medical University
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Li Dong
College of Life Sciences, Hebei University
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