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Measurement of drug lipophilicity and pKa using acoustics.

Lipophilicity of chemicals and drug candidates is normally described in terms of octanol/water partitioning and log P. We investigated an alternate approach to lipophilicity determination using a mimic of an alkyl alcohol with compound partitioning quantified using acoustic sensing. A self-assembled monolayer composed of HSC(10)(CH(2)CH(2)O)(6)C(18) was formed on planar gold electrodes of a piezoelectric acoustic sensor. The system was challenged with compounds covering a 4-log range of log D values. As compounds partitioned in the interfacial layer, changes in sensor resonant frequency were found to correlate with compound partition coefficients (log P) and with distribution coefficients (log D). Linear concordance (R(2) = 0.933) was established between log(-dF/M(w)t) and log P and with log D in both water and biological buffers at variant pH (pH 5.2 to 7.8). In turn, drug pK(a) could be determined by profiling log D changes during pH titration. The lipophilicity/pH profile of a weakly basic drug (quinine; pK(a) = 7.95) was sigmoidal with respect to -dF/M(w) values, with a profile inverse to that of a weakly acidic drug (naproxen; pK(a) = 4.15).