The novel dry milling technique has been developed by using a mechanical powder processor for improving the dissolution properties of poorly water-soluble drugs. It was found that the drug crystals were well pulverized by co-processing with fine particles of corn starch (CS). The morphological observation and particle size evaluation revealed that the processed products formed the composite particles with ordered-mixed structure, having double-layered particles with a core of CS and a coating layer of phenytoin (Phe), as a model drug. This result suggested that the drug crystals were selectively micronized and the resultant miniaturized Phe particles were adhered/fixed on the surface of un-milled CS particles. The mechanical characteristics detected by the indentation test assumed that the brittle Phe crystals sandwiched between elastic CS particles would be successfully crushed down by high shearing stress in the processor. The newly-established dispersion-sedimentation test indicated that the fine Phe particles were immediately detached from the composite particles in aqueous phase, constructing the suspension. The dissolution behavior from the processed particles was found to be improved and strongly dependent on the size and amount of detached Phe particles. Such milling and ordered-mixturization have been also successfully done by using recrystallized larger Phe particles than 100μm. These results would propose the contamination-free dry milling technique without using hard milling balls or beads. The mechanism of the current milling and ordered-mixing phenomena is also provided in this report.

译文

通过使用机械粉末处理器开发了新颖的干磨技术,以改善水溶性差的药物的溶解性能。发现通过与玉米淀粉 (CS) 的细颗粒共加工,药物晶体被很好地粉碎。形态观察和粒度评估表明,加工后的产品形成了具有有序混合结构的复合颗粒,具有具有CS核心和苯妥英 (Phe) 涂层的双层颗粒,作为模型药物。该结果表明,药物晶体被选择性微粉化,并且所得的微型Phe颗粒粘附/固定在未研磨的CS颗粒的表面上。通过压痕测试检测到的机械特性假设夹在弹性CS颗粒之间的脆性Phe晶体将被处理器中的高剪切应力成功压碎。新建立的分散沉降测试表明,细小的Phe颗粒立即从水相中的复合颗粒中分离出来,形成了悬浮液。发现处理后的颗粒的溶解行为得到改善,并且在很大程度上取决于分离的Phe颗粒的大小和数量。通过使用重结晶的大于100微米的较大Phe颗粒也成功地完成了这种研磨和有序混合。这些结果将提出无污染的干磨技术,而无需使用硬磨球或珠。本报告还提供了当前铣削和有序混合现象的机理。

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