Abstract

A thermodynamic analysis of the Collander equation, ln PI = a + b ln PII (I and II refer to two different partitioning systems with partition coefficients PI and PII, respectively), is given and applied to three forms of correlation. The intercept, a, is shown to have no general fundamental significance whereas the slope, b is shown to reflect differences in non-aqueous solvent properties; b is also shown to be of use in scaling solvent behaviour to select solvents which closely represent biological membrane properties for use in partitioning studies. Laboratory and literature data are subjected to the analysis.

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