Table 2 The activation energy values obtained by the KAS method for the three analyzed active substances utilised DSC data (a) respectively TG data (b)
From: Comparative kinetic analysis on thermal degradation of some cephalosporins using TG and DSC data
E a kJ mol-1 | Conversion degree α |
kJ mol-1 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | ||
Cefadroxil | 283.1 | 283.3 | 283.2 | 287.1 | 284.1 | 286.5 | 283.0 | 285.8 | 290.8 | 285.2 |
(a)[20] | ±5.5 | ±8.9 | ±3.3 | ±3.4 | ±7.4 | ±1.5 | ±4.5 | ±1.1 | ±2.2 | ±0.9 |
Cephalexin | 236.7 | 247.1 | 249.6 | 250.2 | 251.4 | 254.4 | 261.4 | 264.6 | 270.8 | 254.0 |
(a)[11] | ±17.3 | ±5.7 | ±2.3 | ±1.5 | ±0.3 | ±0.9 | ±1.8 | ±12.9 | ±2.4 | ±3.4 |
Cefoperazone | 171.8 | 192.5 | 188.0 | 189.6 | 189.0 | 190.7 | 173.2 | 182.6 | 179.8 | 184.1 |
(a) | ±5.5 | ±3.8 | ±3.7 | ±3.8 | ±3.8 | ±3.9 | ±2.4 | ±1.3 | ±0.6 | ±2.6 |
Cefadroxil | 389.2 | 379.9 | 366.7 | 370.9 | 363.2 | 354.2 | 340.7 | 338.6 | 336.2 | 359.9 |
(b) | ±2.7 | ±3.4 | ±1.8 | ±1.3 | ±1.8 | ±8.5 | ±4.4 | ±7.8 | ±4.4 | ±6.3 |
Cephalexin | 242.7 | 240.2 | 231.0 | 224.7 | 213.6 | 239.9 | 240.4 | 243.0 | 257.1 | 236.9 |
(b) | ±1.2 | ±2.2 | ±7.6 | ±2.3 | ±4.1 | ±4.8 | ±18.5 | ±9.0 | ±19.3 | ±4.2 |
Cefoperazone | 221.3 | 186.4 | 182.7 | 178.5 | 165.8 | 170.2 | 148.6 | 140.8 | 141.9 | 170.7 |
(b) | ±8.6 | ±4.6 | ±3.9 | ±4.0 | ±2.6 | ±7.1 | ±3.3 | ±5.1 | ±1.9 | ±8.5 |