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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 E ¯ a
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