Counterion Binding by Polyelectrolytes. V. The Effect of Binding of Univalent Cations by Polyphosphates on the Intrinsic Viscosity1

1960 ◽  
Vol 82 (6) ◽  
pp. 1311-1314 ◽  
Author(s):  
Philip D. Ross ◽  
Ulrich P. Strauss
Keyword(s):  
Univalent Cations ◽  
Counterion Binding

Binding of magnesium and lanthanum ions to heparin in the presence of sodium ions. A relationship between 13C chemical shift displacements and counterion condensation theory

1987 ◽  
Vol 65 (8) ◽  
pp. 1739-1745 ◽  
Author(s):  
Photis Dais ◽  
Qin-Ji Peng ◽  
Arthur S. Perlin
Keyword(s):  
Chemical Shift ◽  
Sodium Ions ◽  
Univalent Cations ◽  
Counterion Condensation ◽  
Ionic Radii ◽  
Counterion Binding ◽  
Binding Preference ◽  
13C Chemical Shift ◽  
Site Binding ◽  
C Nmr

Interactions between beef lung heparin and Mg2+ and La3+ counterions, in the presence of sodium ions, have been investigated by 13C-nmr spectroscopy. The chemical shift displacements observed for the carbons of the main disaccharide unit of heparin, when analysed on the basis of counterion condensation theory, indicate that the association between the heparin polyanion and Mg2+ is a delocalized process. This is analogous to the Ca2+/Na+/heparin system, despite the fact that the binding affinity of heparin for Ca2+ is stronger than that for Mg2+. By contrast, the interaction with La3+ is in excess of the theoretical predicted, which suggests that there is at least a partial site-binding of this counterion. In Ca2+/M+/heparin systems in which M+ = Na+ or K+, the selective binding preference of heparin for the univalent cations may be related to the order of their crystallographic ionic radii. A critical assessment is offered of the validity of this nmr spectroscopic approach to the study of counterion binding to heparin.

Effect of Counterion Binding to Swelling of Polyelectrolyte Brushes

Langmuir ◽  
2021 ◽  
Author(s):  
Chunda Ji ◽  
Chao Zhou ◽  
Bintao Zhao ◽  
Jingfa Yang ◽  
Jiang Zhao
Keyword(s):  
Counterion Binding ◽  
Polyelectrolyte Brushes

Counterion binding in polyelectrolyte theory

1979 ◽  
Vol 12 (12) ◽  
pp. 443-449 ◽  
Author(s):  
Gerald S. Manning
Keyword(s):  
Counterion Binding ◽  
Polyelectrolyte Theory
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