Notre groupe organise plus de 3 000 séries de conférences Événements chaque année aux États-Unis, en Europe et en Europe. Asie avec le soutien de 1 000 autres Sociétés scientifiques et publie plus de 700 Open Access Revues qui contiennent plus de 50 000 personnalités éminentes, des scientifiques réputés en tant que membres du comité de rédaction.
Les revues en libre accès gagnent plus de lecteurs et de citations
700 revues et 15 000 000 de lecteurs Chaque revue attire plus de 25 000 lecteurs
Jing Xue, Chang-qin Hu, Li-hong Yang, Rui-ping Wei, Jian-wen Li and Bing-zhang Hou
Objective: The aim of this work was to study the relationship between the crystal form of Cefoperazone sodium (CPZ-Na) and its stability. Methods: To classify CPZ-Na into amorphous powder and crystalline, powder X-ray diffraction (PXRD) was used. To classify CPZ-Na crystal powder into crystal form A and B, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used. To further classify CPZ-Na crystal form A into different subtypes, clustering of PXRD data and scanning electron microscopy (SEM) were used. To compare the stability of CPZ-Na crystal form A and B, temperature controlled PXRD and high performance liquid chromatography (HPLC) were used. Results: CPZ-Na was classified into amorphous powder and crystalline, CPZ-Na crystal powder was classified into crystal form A and B, and CPZ-Na crystal form A was further classified into different subtypes. Moreover, the stability of CPZ-Na crystal form A was higher than that of crystal form B, and different subtypes of CPZ-Na crystal form A had different stability. Conclusions: There was a close relationship between the crystal form of CPZ-Na and its stability.