期刊
CURRENT PHARMACEUTICAL ANALYSIS
卷 7, 期 4, 页码 268-274出版社
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/157341211797457961
关键词
Activation energy; Cephalosporin salts; Differential scanning calorimetry; Kinetic analysis; Kissinger equation; Penicillin salts; Pre-exponential factor; Storage times; Thermal stability
资金
- Sapienza University of Rome
The thermal stability and thermal decomposition behavior of sodium salts of some penicillins and cephalosporins have been studied using a differential scanning calorimetry technique under a stream of air with a linear heating rate up to 873 K. A model-free kinetic method based on the Kissinger equation was applied to decomposition processes of several penicillin and cephalosporin sodium salts to determine activation energy and the pre-exponential factor, following a simplified approach. The values of these parameters referring either to the first or to the slowest decomposition process were used in an attempt to calculate the lifetime for a 1.0% conversion degree of carbenicillin and cephalosporin C, extrapolated at 298.15, 323.15, 373.15 and 423.15 K. Lastly, a comparison of stability data and different calorimetric curve profiles of several antibiotics belonging to the cephalosporin and penicillin classes led to the conclusion that the presence of penicillanic and cephalosporanic rings in all the molecular structures considered does not seem to noticeably affect the overall decomposition mechanisms of the various antibiotics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据