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            美國布魯克海文儀器公司>資料下載>測量應用案例-20200704

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            測量應用案例-20200704

            閱讀:117          發(fā)布時間:2020-7-6
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             文獻名:Freeze-drying process for the design of porous formulations based on bismuth-potassium-ammonium citrate 

             

            作者 Ekaterina S. Naydenko, Tatyana Yu. Podlipskaya, Yurii M. Yukhin & Andrey G. Ogienko

             

             

            摘要:The objective of this study was to find optimal freeze-drying process parameters to design porous and friable freeze-dried bismuth-potassium-ammonium citrate (FD BPAC) with improved dissolution behavior. The nucleation and melting temperatures of frozen BPAC solution in water and tert-butanol/water co-solvent system were studied with use of thermal analysis. The phases that resulted on cooling were studied by low-temperature powder x-ray diffraction. BPAC formed an amorphous freeze concentrate on cooling and remained amorphous during freeze-drying and subsequent storage. The nucleation of colloidal bismuth subcitrate (CBS) in the FD BPAC and starting BPAC systems in 0.1 M and 0.01 M HCl was studied by dynamic light scattering (DLS) method. The proposed preparation method of FD BPAC can be the basis for design of formulations with enhanced dissolution rate for bismuth-based triple/quadruple therapy, where FD BPAC simultaneously act as a carrier and an active ingredient.

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