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Anion-Specific Partitioning in Two-Phase Finite Volume Systems: Possible Implications for Mechanisms of Ion Pumps

2009; American Chemical Society; Volume: 113; Issue: 23 Linguagem: Inglês

10.1021/jp809051j

1520-6106

Mathias Boström, Eduardo R. A. Lima, Evaristo C. Biscaia, Frederico W. Tavares, Pierandrea Lo Nostro, Drew F. Parsons, Vivianne Deniz, Barry W. Ninham,

Lipid Membrane Structure and Behavior

In two-phase finite volume systems of electroneutral phospholipids, the electrolyte concentration is different in the two phases. The partitioning is highly anion-specific, a phenomenon not accounted for by classical electrolyte theories. It is explained if ionic dispersion forces that lead to specific ion binding are taken into account. The mechanism provides a contribution to active ion pumps not previously considered.