Abstract
Production of spherical crystals with an appropriate particle size is an important objective for active agents dedicated to direct tablet making (Diao et al. Nat. Mater. 2011, 10, 867−871; Tahara, K. et al. Cryst. Growth Des. 2015, 15, 5149–5156). The material chosen for our experiments, ambroxol hydrochloride, is such a solid compound. The optimal habit for the crystals of direct compressible active agents and additives includes sphericity, proper mean particle size, and appropriate surface. The main objective of the present work is to compare typical and nontypical spherical crystallization methods and to investigate their applicability for ambroxol hydrochloride. The particles were investigated by light microscopy, coupled with an image analyzator program, scanning electron microscopy, powder X-ray diffractometry and differential scanning calorimetry in order to obtain information about particle morphology, mean particle size, aspect ratio, roundness and potential polymorphic transitions. Powder rheolo...
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