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Lipophilicity, or “fat friendly” as derived from the Greek, is described as the degree to which an organic molecule dissolves in fat, oil, or nonpolar organic solvents (i.e., hexanes), as opposed to polar solvents (i.e., water). Of all the physiochemical properties measured and monitored in a chemical optimization program en route to a drug candidate, lipophilicity is the most important, as it influences ligand–target binding interactions, solubility, ADME (absorption, distribution, metabolism, and elimination) properties, as well as in vivo toxicological outcomes, and, therefore, the overall quality of the drug candidate. Historically, LogP, the partition coefficient of a molecule between octanol (lipophilic phase) and water (hydrophilic phase), was used to measure lipophilicity; however LogD, the LogP at pH 7.4 (the physiological pH of blood serum), is now often employed to more accurately account for charged molecules. Recently,...
- Hughes JD, Blagg J, Price DA, Bailey S, DeCrescenzo GA, Devraj RV, Ellsworth E, Fobian YM, Gibbs ME, Giles RW, Greene N, Huang E, Krieger-Burke T, Loesel J, Wager T, Whitely L, Zhang Y (2008) Physiochemical drug properties associated with in vivo toxicological outcomes. Bioorg Med Chem Lett 18:4872–4875PubMedCrossRefGoogle Scholar