阿拉伯木聚糖-甘薯淀粉复合体系理化特性表征OA北大核心CSTPCD

The physicochemical properties of gelatinization,texture,rheology,and water migration of the arabinoxylan(AX)-sweet potato starch(SPS)composite system were investigated.The starch system was prepared by adding different concentrations of arabinoxylan instead of the same amount of sweet potato starch.The physicochemical and structural properties of the AX-SPS composite system were characterized by means of a Brabander viscometer,scanning electron microscope,rheology analyzer,etc.Results showed that compared with the natural SPS,the viscosity value,rebound value,and disintegration value of the arabinoxylan-sweet potato starch composite system decreased,while the gelatinization temperature increased.With the increase of the AX addition ratio,the surface of the starch gel fault was rough and the number of holes increased.Static rheological analysis showed that the AX-SPS composite systems were typical shear-diluted pseudoplastic fluids,and the pseudoplastic behavior weakened with the increase of the proportion of AX added.The dynamic rheological analysis showed that the addition of AX reduced the storage modulus(G')and loss modulus(G")of the composite system.Texture analy-sis and low-field nuclear magnetic resonance analysis showed that the addition of AX reduced the hardness and elasticity of sweet potato starch gel,and improved the texture and water retention.Infrared spectrum analysis showed that the double helix structure and the order damage degree of starch increased with the increase of AX addition,and the hydrogen bond force of the complex system increased.In con-clusion,the addition of AX can improve the gelatinization,theology,texture,water retention,and other physicochemical properties of SPS,so that sweet potato starch has a broader application prospect in food,medicine,chemical,and other fields.