کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2505584 | 1557491 | 2008 | 8 صفحه PDF | دانلود رایگان |
Oleanolic acid is a naturally occurring compound used clinically in China for the treatment of hepatitis B. The solid-state chemistry of oleanolic acid recrystallized from a variety of solvents was investigated. Glassy materials were prepared from dichloromethane and chloroform solvents. The oleanolic acid non-solvate prepared from acetone (OA-acetone), and the two oleanolic acid solvates prepared from methanol (OA-methanol) and ethanol (OA-ethanol) were physicochemically characterized. Upon desolvation, both the methanol and ethanol solvates were found to undergo phase transformation to a crystalline phase similar to OA-acetone around 190–195 °C. The PXRD patterns of commercial pharmaceutical grade OA and the OA-methanol were similar, so the commercial form is probably desolvated oleanolic acid methanol solvate.
Journal: International Journal of Pharmaceutics - Volume 355, Issues 1–2, 1 May 2008, Pages 195–202