Effect of Cellulose Nanocrystals on Pasting and Rheological Properties of Sweet Potato Starch
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摘要: 采用快速黏度分析仪以及流变仪分析纤维素纳米晶体对甘薯淀粉短期回生的影响。结果表明:随着0.03、0.06、0.09、0.12、0.15 g的纤维素纳米晶体添加到1.5 g甘薯淀粉中,其回生值明显低于纯淀粉。静态剪切流变测试结果表明,复合体系符合幂定律模型,是一种假塑性流体,剪切应力随着纤维素纳米晶体添加量增加而呈现降低趋势,稠度系数K减少,流体指数n增大。动态黏弹性测试结果表明,纤维素纳米晶体增强了体系的流体性。纤维素纳米晶体是一种有前景的淀粉短期回生抑制剂。Abstract: The effect of cellulose nanocrystals on the short-term retrogradation of sweet potato starch with were determined by using a rapid visco analyzer(RVA)and a rheometer. The setback values significantly lower than that of native starch with 0.03,0.06,0.09,0.12,0.15 g of cellulose nanocrystals adding to 1.5 g of sweet potato starch. The results of static shear rheological test showed that the rheological properties of cellulose nanocrystals-sweet potato starch paste were consistent with the power-law model and called as pseudoplastic fluid. Furthermore,the declining trend of shear stress was observed by increasing addition dosage of cellulose nanocrystals. The consistency coefficient K was decreased and the fluid index n was increased. The dynamical visco elastic experiment showed that cellulose nanocrystals enhanced the fluidity of the complex. Cellulose nanocrystals are promising inhibitor of starch short-term retrogradation.
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期刊类型引用(3)
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