Preferential interaction coefficient for nucleic acids and other cylindrical poly-ions

Details Preferential interaction coefficient for nucleic acids and other cylindrical poly-ions Preferential interaction coefficient for nucleic acids and other cylindrical poly-ions

2007-04-04

arxiv.org/abs/0704.0587v1

Macromolecules 40, 1305 (2007)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1021/ma061497l

The thermodynamics of nucleic acid processes is heavily affected by the electric double-layer of micro-ions around the polyions. We focus here on the Coulombic contribution to the salt-polyelectrolyte preferential interaction (Donnan) coefficient and we report extremely accurate analytical expressions valid in the range of low salt concentration (when polyion radius is smaller than the Debye length). The analysis is performed at Poisson-Boltzmann level, in cylindrical geometry, with emphasis on highly charged poly-ions (beyond ``counter-ion condensation''). The results hold for any electrolyte of the form $z_-$:$z_+$. We also obtain a remarkably accurate expression for the electric potential in the vicinity of the poly-ion.

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