GELATION MECHANISM OF IONIC POLYSACCHARIDES

被引：7
|
作者：
GAMINI, A [1 ]
CIVITARESE, G [1 ]
CESARO, A [1 ]
DELBEN, F [1 ]
PAOLETTI, S [1 ]
机构：
[1] UNIV TRIESTE,DEPT BIOCHEM BIOPHYS & MACROMOLEC CHEM,I-34127 TRIESTE,ITALY
来源：
MAKROMOLEKULARE CHEMIE-MACROMOLECULAR SYMPOSIA | 1990年 / 39卷
关键词：
D O I：
10.1002/masy.19900390113
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Experimental results obtained by membrane equilibria, osmotic pressure, viscosity and circular dichroism measurements on alginate and pectate solutions in the presence of Ca2+ ions are presented. From equilibrium dialysis data both electrostatic and cooperative interactions seem to describe the binding process of Ca2+ ions onto polymer chains. An increase of the number-average molecular weight MBAR(n) for both polysaccharides with calcium ion concentration is observed. An increase of polymer dimensions can well account for the observed increase of the intrinsic viscosity [eta] with bound Ca2+ ion concentration at several ionic strengths.
引用
收藏
页码：143 / 154
页数：12
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