Abstract
Using a simple two-compartment diffusion cell it has been demonstrated that the transport of a model large organic ion (sodium cromoglycate), across a polyamide membrane can be altered by the presence of hydrophobic monovalent quaternary ammonium ions added to the bulk donor phase. There is an initial enhancement of ion flux at low quaternary ion concentration, which is directly related to ammonium ion concentration and hydrophobicity. The flux falls markedly at the aqueous solubility product between the two ions (where a complex coacervate forms). Results are consistent with previous findings using in vivo absorption systems
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