کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5821026 | 1557409 | 2012 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Behaviour of HPMC compacts investigated using UV-imaging
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کلمات کلیدی
موضوعات مرتبط
علوم پزشکی و سلامت
داروسازی، سم شناسی و علوم دارویی
علوم دارویی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The aim of the study was to visualize the behaviour of the hydroxypropyl methylcellulose (HPMC) in a buffer solution using UV imaging. The obtained results were related to rheological measurements in order to gain insight into critical polymer properties affecting drug release. Two viscosity grades of HPMC, 15Â cP and 50Â cP, were used. The behaviour of the polymer at the surface of the compact was observed by UV-imaging at 214Â nm for 90Â min in a stagnant buffer solution and in presence of flow. Steady shear and oscillatory shear measurements were conducted to determine the rheological characteristics.Three distinctive phases could be detected by real-time UV-imaging of the HPMC; gel formation due to water penetration, further expansion of the gel into solution and finally steady conditions, where a critical polymer concentration that can withstand the shear forces without eroding was observed. The critical concentration corresponded to the rheologically determined gel point, which is the lowest concentration where a 3D-network is obtained. Higher viscosity grade HPMC swelled more rapidly and lead to a thicker gel layer, which was more resistant towards the shear forces due to the applied flow. The results showed that UV imaging is suitable for obtaining both qualitative and quantitative information on polymer behaviour.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Pharmaceutics - Volume 427, Issue 2, 10 May 2012, Pages 345-353
Journal: International Journal of Pharmaceutics - Volume 427, Issue 2, 10 May 2012, Pages 345-353
نویسندگان
Jari Pajander, Stefania Baldursdottir, Jukka Rantanen, Jesper Ãstergaard,