沙蒿胶对糯米淀粉糊化特性和流变特性的影响
Effects of Artemisia sphaerocephala Krasch.gum on gelatinization and rheological properties of waxy rice starch
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摘要: 将亲水胶体(沙蒿胶)与糯米淀粉进行复配,研究不同添加量(0.1%、0.3%、0.5%、0.7%和0.9%)的沙蒿胶对糯米淀粉糊化特性和流变特性的影响。结果表明:添加沙蒿胶可提高糯米淀粉的糊化黏度及溶胀度,降低糯米淀粉的凝胶强度和水分流动性;糯米淀粉呈现假塑性流体的特性,添加沙蒿胶使其表观黏度、稠度系数(K)和流动特性指数(n)均增加,即沙蒿胶具有协同增稠作用;沙蒿胶能提高糯米淀粉弹性模量(G')、黏性模量(G″)和损耗角正切值(tan δ),但整体上表现为增强糯米淀粉可流动性。Abstract: In order to investigate the effects of hydrophilic colloid (Artemisia sphaerocephala Krasch.gum (ASKG)) on the gelatinization and rheological properties of waxy rice starch, ASKG was mixed with waxy rice starch at different ratio (0.1%, 0.3%, 0.5%, 0.7% and 0.9%).The results showed that the addition of ASKG could increase the gelatinization viscosity and swelling degree of waxy rice starch, and decrease the gel strength and water fluidity of waxy rice starch. Waxy rice starch had the properties of pseudoplastic fluid. The addition of ASKG could increase the apparent viscosity, consistency coefficient (K) and flow characteristic index (n), indicating that ASKG had synergistic thickening effect. ASKG could improve the elastic modulus (G'), viscosity modulus (G″) and loss angle tangent value (tan δ) of waxy rice starch, but the overall performance was to enhance the fluidity of the system.
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