Study on Thermal Decomposition Behavior of Tea Saponin from Camellia Oleifera Cake

Abstract

Different contents of tea saponin (CZS-1 and CZS-2) from Camellia oleifera Cake were prepared via ethanol extraction method, and thermal degradation temperature and thermal degradation kinetics of the CZS-1 and CZS-2 were studied by thermogravimetric analyzer method. The results indicate that the thermal degradation of CZS-2 involves three steps, the thermal degradation of CZS-1 involve four steps. The thermal decomposing temperature <430°C, thermal stability of CZS-2 was worse; while the thermal decomposing temperature >430°C, the relationship was just opposite. With the heating rate increasing, thermal decomposing temperature of CZS-1 and CZS-2 were increased gradually. The thermal degradation kinetics of CZS-1 and CZS-2 were studied by Kissinger’s method. It was found that thermal degradation activation energy of CZS-1 and CZS-2 were 43.6 kJ/mol and 30.7 kJ/mol at the first and second steps, respectively.