一种新型生物聚合物Ss的流变学性质及成胶特性

Rheological and Gelling Properties of a Novel Biopolymer Ss

本文对一种新型生物聚合物Ss的流变学性质及成胶特性进行了研究。该聚合物的流变学性质与黄原胶类似,具有高粘性、假塑性及耐盐性。0.6%以上的Ss溶液加热(≥75℃)并冷却至室温可形成凝胶,加入金属离子可以改变其成胶所需的最低聚合物浓度及所成凝胶的性质。利用质构分析(TPA)方法,研究了不同聚合物浓度和钙离子浓度下凝胶的质构性质。钙离子的加入能促进凝胶的形成,凝胶的硬度、弹性、内聚性随聚合物浓度及钙离子浓度的增加而增大,但大于最适钙离子浓度时,硬度、弹性及内聚性均有所下降。

The rheological and gelling properties of a novel biopolymer Ss have been investigated. Like Xanthan Gum, this polymer was distinguished by its high viscosity, pseudoplasticity and salt-tolerance. 0.6%（W/V） Ss concentration transformed to gel by heating （≥75℃） and then cooling to room temperature. Adding metal ions changed the critical concentration of gelling as well as the textural characters of the gel forming. The effects of different polymer and calcium ion concentrations on the textural properties were examined using instrumental Texture Profile Analysis （TPA）. Adding calcium ions enhanced sol-gel transition. Hardness, springiness and cohesiveness increased with increasing polymer and calcium ion concentration, but decreased when surpassed a critical calcium ion concentration.