title: Quantitative structure retention/activity relationships of biologically relevant 4-amino-7-chloroquinoline based compounds.
abstract: The chromatographic behaviour of series of 4-amino-7-chloroquinoline (4,7-ACQ) based compounds was studied by reversed-phase thin-layer chromatography (RPTLC) with binary mobile phases containing water and the organic modifiers, DMSO or acetone. The lipophilicity of the studied compounds was determined by extrapolation of retention parameters RM to pure water content in mobile phase. In order to obtain some basic insight into the chromatographic behaviour and structural features of investigated compounds, PCA was performed on both chromatographic data (RM values) and calculated 2D and 3D structural descriptors. Both QSRR and QSAR models were built by means of the partial least squares (PLS) statistical method. It was found that descriptors which encode hydrophobic (dispersive) interactions have positive influence on retention, while influence of descriptors encoding polar interactions was negative. According to the obtained PLS model for inhibition of botulinum neurotoxin serotype A light chain, hydrophobic interactions influence positively on the mechanism of action of the investigated 4,7-ACQ, while polar interactions are less favoured. Contrary, the results of PLS modelling of activity against Plasmodium falciparum strains (W2, D6 and TM91C235) indicate that higher polarity of 4,7-ACQ contribute to their higher antimalarial activity.
authors.affiliation: Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia. Electronic address: sgaica@chem.bg.ac.rs.
authors.forename: Sandra
authors.initials: S
authors.lastname: Šegan
authors.affiliation: Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11158 Belgrade, Serbia.
authors.forename: Igor
authors.initials: I
authors.lastname: Opsenica
authors.affiliation: Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11158 Belgrade, Serbia.
authors.forename: Mario
authors.initials: M
authors.lastname: Zlatović
authors.affiliation: Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11158 Belgrade, Serbia.
authors.forename: Dušanka
authors.initials: D
authors.lastname: Milojković-Opsenica
authors.affiliation: Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11158 Belgrade, Serbia.
authors.forename: Bogdan
authors.initials: B
authors.lastname: Šolaja
mesh_terms: D002855:Chromatography, Thin Layer / Q000379:methods; D057927:Hydrophobic and Hydrophilic Interactions; D021281:Quantitative Structure-Activity Relationship; D011804:Quinolines / Q000032:analysis* / Q000737:chemistry*
chemical_list: D011804:Quinolines
keywords: 4‑Amino-7-chloroquinoline; Lipophilicity; Quantitative structure activity relationship (QSAR); Quantitative structure-retention relationship (QSRR); Reversed-phase thin-layer chromatography (RPTLC)