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Overcharging in biological systems: reversal of electrophoretic mobility of aqueous polyaspartate by multivalent cations.

Physical review letters (2012-06-12)
Anna Kubíčková, Tomáš Křížek, Pavel Coufal, Mario Vazdar, Erik Wernersson, Jan Heyda, Pavel Jungwirth
ABSTRACT

Charge reversal as an extreme case of charge compensation is directly observed by capillary electrophoresis for a negatively charged peptide in aqueous solutions of trivalent cations. Atomistic and coarse-grained simulations provide molecular interpretation of this effect showing that it is largely of electrostatic origin with a minor contribution of chemical specificity of the salt ions.

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