Thermal property and dielectric properties during the pasting process of potato

Dielectric characteristic and the thermal characteristics of potato piece(16.5% water content, 80.7% starch content) were studied with the dielectric spectrometer (DES100) and the difference scanning calorimetry to ensure the relation of paramaters during pasting process. According to the DES curve, the dielectric coefficient(e′) changed enormously with the increase of temperature during 65～80℃ from 1～100 kHz frequence. It appeared a jump change at 67℃, and droped gradually afterwards. The change rule of thermal enthalpy was the same as e′ according to the DSC curve. Three characteristic pasting temperatures were 65℃, 67℃ and 80℃, respectively. It could predominate accurately the pasting processing by analysing thermal property and dielectric properties at the same time synthetically according to the basically same characteristic value from the two curves. The results are useful for further investigations of the pasting process of potato.