Abstract:Thermogravimetric (TG) and Differential Scanning Calorimeter(DSC) were used to determine the heat properties of Roquette Nutriose® resistant starch(RS) in this paper. The TG curve indicated that this kind of resistant starch began to decompose at 296.73 ℃ and the fastest decomposition temperature and the decomposition end temperature were 314.77 ℃ and 332.81 ℃, respectively. The DSC curves indicated that there was evident difference between the first analysis curve and the second analysis curve. Besides a small endothermic peak at about 29.04 ℃ and a cool crystal exothermic peak at about 61.64 ℃ in the first analysis DSC curve of RS, one big endothermic peak began to appear at about 74.67 ℃, and the peak temperature of transformation was about 81.92 ℃(transformation enthalpy 267.1 J/g). The last small endothermic peak in the first analysis DSC curve of RS appeared at about 219.89 ℃. After the temperature of DSC system was quickly lowered to –30 ℃, the endothermic peak appeared at about 31.22 ℃ in the the second analysis curve and the peak temperature of transformation was about 86.39 ℃(transformation enthalpy 38.97 J/g). There was still one small endothermic peak at about 218.70 ℃ and the cool crystal endothermic peak disappeared, which indicated that RS crystal structure changed through heat process.
