Detection of glucose adulterated in Ilex Kudingcha using thermal analysis

Thermal decomposition varying regular of the Ilex Kudingcha adulterated glucose was analyzed using thermal analysis. A new rapid and convenient method to detect the glucose adulterated in Ilex Kudingcha was founded. The thermogravimentry-differential thermogravimetry(TG-DTG) and differentialscanning calorimetry(DSC) curves of the pure Ilex Kudingcha and doped with 5%, 10%, 15%, 20%, 25%, 30% of glucose in mass have been analyzed. Results show that the Ilex Kudingcha will be carbonized when the temperature is at about 300℃ and it will be burned when the temperature exceeds 456℃, and there is obviously exothermic peak at about 332℃ and 476℃ on DSC curve. The DTG and DSC curves of thepure Ilex Kudingcha and the Ilex Kudingcha adulterated glucose are different. It is easy to distinguish the pure Ilex Kudingcha and the doped Ilex Kudingc according to the peak position and enthalpy value.