Abstract
THE hydrophobic anions of dipicrylamine (DpA−) and of sodium tetraphenylborate (TphB−) have been shown to adsorb at deep potential minima near the surfaces of lipid bilayer membranes1. Use of a high field voltage-jump technique has led to direct measurement of the membrane surface charge density attributable to adsorption of these anions2,3, and analyses of such measurements have shown that the magnitude of the membrane surface potential resulting from adsorption of both DpA− and TphB− is too large to be accounted for by conventional Gouy–Chapman theory4,5. Crucial to an understanding of this discrepancy is the question of the location of the plane of adsorbed charge relative to the membrane–solution interface. Experimental results reported here are consistent with the conclusion that these planes are coincident.
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WANG, CC., BRUNER, L. Lipid-dependent and phloretin-induced modifications of dipicrylamine adsorption by bilayer membranes. Nature 272, 268–270 (1978). https://doi.org/10.1038/272268a0
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DOI: https://doi.org/10.1038/272268a0
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