title: Supersaturation-nucleation behavior of poorly soluble drugs and its impact on the oral absorption of drugs in thermodynamically high-energy forms.
abstract: In order to better understand the oral absorption behavior of poorly water-soluble drugs, their supersaturation-nucleation behavior was characterized in fasted state simulated intestinal fluid. The induction time (t(ind)) for nucleation was measured for four model drugs: itraconazole, erlotinib, troglitazone, and PLX4032. Supersaturated solutions were prepared by solvent shift method, and nucleation initiation was monitored by ultraviolet detection. The relationship between t(ind) and degree of supersaturation was analyzed in terms of classical nucleation theory. The defined supersaturation stability proved to be compound specific. Clinical data on oral absorption were investigated for drugs in thermodynamically high-energy forms such as amorphous forms and salts and was compared with in vitro supersaturation-nucleation characteristics. Solubility-limited maximum absorbable dose was proportionate to intestinal effective drug concentrations, which are related to supersaturation stability and thermodynamic solubility. Supersaturation stability was shown to be an important factor in determining the effect of high-energy forms. The characterization of supersaturation-nucleation behavior by the presented method is, therefore, valuable for assessing the potential absorbability of poorly water-soluble drugs.
authors.affiliation: Physical Chemistry, Analytical Research Laboratories, Eisai Product Creation Systems, Eisai Company Ltd, Tsukuba, Ibaraki 300-2635, Japan. s3-ozaki@hhc.eisai.co.jp
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Ozaki
authors.forename: Takuma
authors.initials: T
authors.lastname: Minamisono
authors.forename: Taro
authors.initials: T
authors.lastname: Yamashita
authors.forename: Takashi
authors.initials: T
authors.lastname: Kato
authors.forename: Ikuo
authors.initials: I
authors.lastname: Kushida
mesh_terms: D000042:Absorption; D000284:Administration, Oral; D002626:Chemistry, Pharmaceutical; D004355:Drug Stability; D007408:Intestinal Absorption; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D010599:Pharmacokinetics; D012995:Solubility; D012996:Solutions / Q000737:chemistry; D012997:Solvents; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D004364:Pharmaceutical Preparations; D012996:Solutions; D012997:Solvents; D014867:Water