Thermal analysis kinetics of dioscorea saponin by mechanical activation

Abstract

Dioscorea saponin isolated from the rhizome of Dioscorea nipponica Makino was activated by AGO mill. On the basis of TG-DSC analysis, two endothermic peak of dioscorea saponin after mechanical activation both moved back, and it had finished weightlessness in advance due to the accelerated decomposition. According to thermal analysis kinetics, the average thermal decomposition activation energy of dioscorea saponin after mechanical activation increased, and the maximum activation energy at different conversion rates moved back. According to the determining results of kinetic mechanism function, the thermal decomposition kinetics mechanism functions of dioscorea saponin before and after mechanical activation both fitted the Jander formula. After mechanical activation, the thermal decomposition kinetic mechanism of dioscorea saponin transformed from three-dimensional to two-dimensional diffusion.