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Effect of hydrocolloids on the pasting and rheological characteristics of resistant starch (type 4)

机译：水胶体对抗性淀粉（4型）的糊化和流变特性的影响

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摘要

The pasting and rheological properties of resistant starch-type 4 (RS4) and hydrocolloid mixtures were characterized at 2 different concentrations (0.1 and 0.5%, w/v). When RS4 was mixed with 2 hydrocolloids (pectin and xanthan gum), there was the overall tendency that both swelling power and solubility of the RS4 suspensions significantly increased. Steady shear measurements showed that the RS4 and hydrocolloid samples exhibited shear-thinning behaviors which could be well characterized by the Power law model. A dramatic increase in the viscosity by xanthan gum was also observed, compared to pectin. In addition, dynamic oscillatory tests indicated that the RS4 and hydrocolloid mixtures exhibited more elastic properties with less frequency dependence, compared to RS4 alone. Also, the viscosities of the RS4 suspensions during pasting increased with increasing concentrations of the hydrocolloids used and these effects became significantly dominant when xanthan gum was incorporated.
机译：在2种不同浓度（0.1和0.5％，w / v）下对4型抗性淀粉（RS4）和水胶体混合物的糊化和流变特性进行了表征。当将RS4与2种水胶体（果胶和黄原胶）混合时，总的趋势是RS4悬浮液的溶胀力和溶解度均显着增加。稳定的剪切测量表明，RS4和水胶体样品表现出剪切稀化行为，可以通过幂律模型很好地表征。与果胶相比，还观察到黄原胶的粘度显着增加。此外，动态振荡测试表明，与单独的RS4相比，RS4和水胶体混合物表现出更多的弹性，且频率依赖性较小。而且，糊剂期间RS4悬浮液的粘度随着所用水胶体浓度的增加而增加，并且当掺入黄原胶时这些作用变得显着。

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