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Table 1 Activation energy’s values obtained by Friedman isoconversional method for the three analyzed cephalosporins from 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 (a)[20] 510.3 475.9 468.3 399.5 355.7 331.1 259.1 245.8 194.9 360.1
±1.0 ±0.5 ±1.4 ±2.8 ±12.8 ±3.6 ±7.5 ±9.9 ±10.8 ±37.4
Cephalexin (a) [11 257.7 249.9 256.8 251.8 255.8 243.5 266.2 284.5 295.1 262.4
±2.3 ±4.0 ±5.9 ±2.5 ±3.8 ±7.0 ±12.5 ±5.7 ±9.8 ±5.6
Cefoperazone (a) 147.0 164.4 189.6 202.8 196.5 186.1 192.6 204.3 269.8 194.8
±3.3 ±2.8 ±4.1 ±1.7 ±2.9 ±6.2 ±4.0 ±9.1 ±8.7 ±11.2
Cefadroxil (b) 373.6 432.6 403.3 381.5 306.8 300.9 211.3 159.2 118.4 298.6
±5.2 ±3.9 ±2.0 ±1.3 ±1.5 ±13.2 ±6.9 ±13.2 ±2.7 ±37.5
Cephalexin (b) 272.9 257.2 247.1 253.5 246 232.5 224.7 231.9 209.7 241.7
±3.2 ±7.4 ±2.4 ±13.6 ±11.2 ±33.6 ±8.4 ±9.6 ±8.8 ±6.3
Cefoperazone (b) 168.8 195.5 192.1 165.3 68.1 39.9 61.1 131.0 271.7 143.7
±3.8 ±4.1 ±6.4 ±3.9 ±2.2 ±8.6 ±8.6 ±3.3 ±15.0 ±25.3