Key result
Novel descriptor log Pmw correlates strongly with ex vivo antiplatelet activity, outperforming standard lipophilicity metrics.
Why the study?
A novel descriptor for hydrophobicity, log Pmw, was introduced to improve QSAR studies of antiplatelet agents due to limitations of existing descriptors.
Answers are grounded in this paper and cite their sources.
May guide antiplatelet QSAR development; leaves open clinical translation pending prospective validation.
Herein we describe the introduction and application of a novel and useful descriptor, logarithm of micelle-water partition coefficients (log Pmw), for hydrophobicity of compounds. A QSAR study using log Pmw on antiplatelet activities ex vivo of 2-substituted phenyl and benzimidazolyl-5-methyl-4-(3-pyridyl)imidazoles showed its usefulness. Antiplatelet activities could be rationalized by means of only log Pmw with an excellent correlation (r = 0.772, s = 0.257, F = 11.07 **, n = 18), while use of other descriptors such as CLOGP values and retention factors (k') failed. Pmw values can easily be obtained using a normal HPLC system using a micelle aqueous solution as the mobile phase. HPLC techniques offer the advantage of tolerating lower sample purity, smaller sample size, and being dynamic range, compared with the flask-shaking method for measurement of logarithm of 1-octanol/water partition coefficients (log P), which is widely used in QSAR study. These indicated that log Pmw could be a useful descriptor for hydrophobicity of compounds.
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Tanaka et al. (1994) studied Antiplatelet activities (n=18). log Pmw (logarithm of micelle-water partition coefficients) vs. CLOGP values and retention factors (k') was evaluated on Correlation with ex vivo antiplatelet activities (r = 0.772). The novel descriptor log Pmw showed an excellent correlation with ex vivo antiplatelet activities (r = 0.772, n = 18), whereas other descriptors like CLOGP and retention factors failed.
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