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Influence of complex formation on membrane transport.

Abstract Theoretical aspects of the influence of complex formation on transport across a diffusional barrier of three species, participating in an association-dissociation reaction, are presented. On the basis of solution of a nonlinear differential equation derived from equations of continuity, valid for stationary states, when diffusion coefficients are constants and coupling between fluxes of different species is ignored, it is shown that the usual assumption that the complex formation reaction is at equilibrium at all locations in the system is not valid, except when the concentration of one of the reactant species is maintained equal on both sides of the membrane. In the general case, methods of calculation of reactionrate profiles and concentration profiles to any desired order of approximation in the inhomogeneous diffusional barrier region from experimentally measurable quantities are included. The method of computing the association-rate and dissociation-rate constants from suitable transport measurements is presented.