Wide-range log P_<o/w> estimation of drug-related compounds by flow-injection analysis combined with a novel two-phase solvent partitioning

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High-throughput method for measuring a partition coefficient(K) of highly hydrophobic and/or hydrophilic compound was established by flow-injection analysis(FIA) combined with novel two-phase solvent partitioning. The measured K values of 51 kinds of standard compounds, especially their log K values were closely related to their(literature-based) log P(P : partition coefficient between octanol/water two-phase system) values. The relationship between the log P and the log K values was expressed as the correlating equation "log P=2.849×log K-0.1576". Therefore the combination of the K measurement by FIA and the correlating equation enable to estimate a wide-range log P values(+8～-8) of a huge variety of compounds from their measured log K values(+3～-3). In this study, the estimated log P values of highly polar amino acids, peptides, nucleotides were obtained by the above method.