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標題: Effect of heat-moisture treatments on the digestibility and physicochemical properties of Tainung No.57 and Tainung No.66 sweet potato starches
作者: Hsin-Yi Chi
關鍵字: 甘藷澱粉;消化性;理化性質;流變性質;Sweet potato starch;digestibility;physicochemical property;rheology
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In the present study, the effects of heat-moisture treatment( HMT, under 20%, 25% and 30% moisture level, 105℃, 2 hours) on physicochemical and structure properties of Tainung No.57 and Tainung No.66 sweet potato starches originated from Longjing were investigated. The water content of Tainung No.57 and Tainung No.66 sweet potato was 67.32% and 75.27%, and the yield of its starch was 67.32% and 23.89%(dry base), respectively. The results showed that the birefringence of HMT starch samples of two spices was not changed, but it had pore at hilum and found concavity on granule surface after heat-moisture treatment under different moisture level. As moisture level of heat-moisture treatment increased, the content of damage starch increased gradually, and the content of resistant starch decreased gradually. Furthermore, the crystalline pattern of native and HMT starch samples changed from Ca type into A type gradually, and compared native starch with HMT starch samples, the relative crystallinity increased and then decreased. Moreover, the HMT starch samples of two exhibited increased pasting temperature, reduced viscosities, and no longer exhibited traditional pasting profiles for lack of a true peak viscosity and no breakdown. The swelling power and solubility of all starches increased while temperature increased, as moisture level of heat-moisture treatment increased, the swelling power and solubility decreased when exceeded gelatinization temperature. Rheological behavior of 10% sweet potato starch paste belongs to shear-thinning fluid. Dynamic viscoelastic results also revealed that the sweet potato paste belonged to weak gels, as moisture level of heat-moisture treatment increased, sweet potato starch paste changed into strong gel and the modulus of 10% sweet potato paste increased.
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