Physicochemical Characterization and Cyclodextrin Complexation of the Anticancer Drug Lapatinib

Gerg Tóth, Ádám Jánoska, Gergely Völgyi, Zoltán István Szabó, Gábor Orgován, Arash Mirzahosseini, B. Noszál

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Lapatinib (LAP), the tyrosine kinase inhibitor drug with moderate bioavailability, was characterized in terms of physicochemical properties: acid-base characteristics, lipophilicity, and solubility. The highly lipophilic nature of the drug and its extremely low water solubility (S0=0.82 nM) limit the development of a parenteral formulation. In order to enhance solubility and bioavailability, inclusion complex formation with cyclodextrins (CDs) is a promising method of choice. Therefore, LAP-CD interactions were also studied by a multianalytical approach. The stability constants of LAP with native cyclodextrins, determined by UV spectroscopy, identified the seven-membered β-CD as the most suitable host. Continuous variation method (Job's plot) by 1H NMR showed a 1: 1 stoichiometry for the complexes. The geometry of the complex was elucidated by 2D ROESY NMR measurements and molecular modeling, indicating that the partial molecular encapsulation includes the fluorophenyl ring of LAP. Phase-solubility studies with four CDs, β-CD, (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD), randomly methylated-β- (RAMEB-) cyclodextrin, and sulfobutylether-β-cyclodextrin (SBE-β-CD), show an AL type diagram and highly increased solubility via CD complexation. The results are especially promising with SBE-β-CD, exerting more than 600-fold gain in solubility. The equilibrium and structural information presented herein can offer the molecular basis for an improved drug formulation with enhanced bioavailability.

Original languageEnglish
Article number4537632
JournalJournal of Chemistry
Publication statusPublished - 2017


ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Tóth, G., Jánoska, Á., Völgyi, G., Szabó, Z. I., Orgován, G., Mirzahosseini, A., & Noszál, B. (2017). Physicochemical Characterization and Cyclodextrin Complexation of the Anticancer Drug Lapatinib. Journal of Chemistry, 2017, [4537632].