Effect of galactomannans on the viscoelastic behaviour of pectin/calcium networks

Polymer Gels and Networks Pub Date : 1996-01-01 Epub Date: 1999-12-09 DOI:10.1016/0966-7822(95)00018-6

J.A.Lopes da Silva , M.P. Gonçalves , J.L. Doublier , M.A.V. Axelos

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引用次数: 24

Abstract

An investigation was carried out on the effect of the addition of galactomannans to pectin/calcium networks with different structural and rheological characteristics. For those pectin/calcium gels characterized by an elastic equilibrium modulus, the addition of the galactomannan increased both the storage and loss moduli, especially at short time scales. This increase was greater than that which could be expected by simple additivity of the viscoelastic properties of each isolated system. The pectin/calcium network remained the continuous gel matrix controlling the viscoelastic behaviour of these systems at low frequency. For pectin/calcium systems close to the sol-gel transition or at low pH, the mixed systems evolved towards the behaviour of viscoelastic liquids in the presence of increasing concentration of the non-gelling polymer. These overall results suggest that there is no specific interaction and that the changes in the rheological properties of the pectin gels are due to galactomannan microphase separation limited by the entrapment of these macromolecules in the pectin-calcium network.

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半乳甘露聚糖对果胶/钙网络粘弹性行为的影响

研究了半乳甘露聚糖对具有不同结构和流变特性的果胶/钙网络的影响。对于那些以弹性平衡模量为特征的果胶/钙凝胶，半乳甘露聚糖的加入增加了储存和损失模量，特别是在短时间尺度上。这一增长大于对每个孤立体系的粘弹性进行简单相加所能预期的增长。果胶/钙网络仍然是连续的凝胶基质，在低频下控制这些体系的粘弹性行为。对于接近溶胶-凝胶过渡或在低pH下的果胶/钙体系，在非胶凝聚合物浓度增加的情况下，混合体系向粘弹性液体的行为发展。这些总体结果表明，没有特定的相互作用，果胶凝胶流变特性的变化是由于半乳甘露聚糖微相分离受到这些大分子在果胶-钙网络中的包裹的限制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Polymer Gels and Networks

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