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Application of Thermogravimetry to the Study of Thermal Decomposition Kinetics of Cefalexin and its Stability

Thermogravimetry was used to study the non isothermal decomposition kinetics and the difference of stability between cefalexin and its excipients. The product of thermal decomposition at the second stage was characterized by infrared spectrometry. The kinetic equation for the second step can be expressed as: dα/d t = A e - E α RT (1-α) 3, which corresponding to the mechanism of “the third order chemical reation”. The mathematic expression of the kinetic compensation effect is found to be: ln A =0.2542 E a-5.2905. The results also indicated that cefalexin has a high activation energy, and a good stability; and its excipients have higher activation energy.