کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2487358 | 1114413 | 2008 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Process Induced Disorder in Crystalline Materials:Differentiating Defective Crystals from the Amorphous Form of Griseofulvin
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کلمات کلیدی
موضوعات مرتبط
علوم پزشکی و سلامت
داروسازی، سم شناسی و علوم دارویی
اکتشاف دارویی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Process Induced Disorder in Crystalline Materials:Differentiating Defective Crystals from the Amorphous Form of Griseofulvin Process Induced Disorder in Crystalline Materials:Differentiating Defective Crystals from the Amorphous Form of Griseofulvin](/preview/png/2487358.png)
چکیده انگلیسی
This research investigates milling induced disorder in crystalline griseofulvin. Griseofulvin was subjected to cryogenic milling for various lengths of time. For comparison, the amorphous form of griseofulvin was also prepared by the quench melt method. Different analytical techniques were used to study the differences between the cryomilled, amorphous and crystalline forms of the drug. Cryogenic milling of griseofulvin progressively reduces the crystallinity of the drug by inducing crystal defects, rather than amorphous materials. Raman analysis provides evidence of structural differences between the two. The differences between the defective crystals produced by milling and the amorphous form are significant enough as to be measurable in their bulk thermal properties. Defective crystals show significant decrease in the heat of fusion as a function of milling time but do not exhibit a glass transition nor recrystallization from the amorphous form. Crystal defects undergo recrystallization upon heating at temperatures well below the glass transition temperature (Tg) in a process that is separate and completely independent from the crystallization of the amorphous griseofulvin, observed above Tg. Physical mixtures of defective crystals and amorphous drug demonstrate that the thermal events associated with each form persist in the mixtures, unaffected by the presence of the other form.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Pharmaceutical Sciences - Volume 97, Issue 8, August 2008, Pages 3207-3221
Journal: Journal of Pharmaceutical Sciences - Volume 97, Issue 8, August 2008, Pages 3207-3221
نویسندگان
Tao Feng, Rodolfo Pinal, M.Teresa Carvajal,