Michel A S, Mestdagh M M, Axelos M A
Université Catholique de Louvain, Unité de Chimie des Interfaces, Louvain-la-Neuve, Belgium.
Int J Biol Macromol. 1997 Aug;21(1-2):195-200. doi: 10.1016/s0141-8130(97)00061-5.
Phase separation and gelation induced by addition of monovalent and divalent cations in iota and kappa carrageenan solutions were investigated as a function of the polymer and cation concentrations. Rheological measurements have also been carried out at a given polymer concentration. The storage modulus (G') determined at a cation/polymer ratio was always higher for kappa- than for iota-carrageenan. For iota carrageenan, G' increased slowly with the monovalent salt concentration and more quickly with the divalent salt concentration. At the opposite, for kappa carrageenan, G' increased more rapidly in the presence of KCl than with calcium or copper. Nevertheless for large salt concentrations, G' became independent of the type and concentration of cations in the kappa carrageenan solution.
研究了在iota和kappa卡拉胶溶液中添加单价和二价阳离子所诱导的相分离和凝胶化现象，作为聚合物浓度和阳离子浓度的函数。在给定的聚合物浓度下也进行了流变学测量。在阳离子/聚合物比例一定时，kappa卡拉胶的储能模量（G'）总是高于iota卡拉胶。对于iota卡拉胶，G'随单价盐浓度缓慢增加，随二价盐浓度增加更快。相反，对于kappa卡拉胶，在KCl存在下G'增加得比钙或铜存在时更快。然而，对于高盐浓度，G'在kappa卡拉胶溶液中变得与阳离子的类型和浓度无关。
