ABSTRACT
Reversed-phase high-performance liquid chromatography assay with the diode array detector was applied for detection of trans-resveratrol complexes with copper (II). Two complexes with copper to resveratrol ratio 3:2 and 1:1 were identified in ethanolic-aqueous solutions in neutral and acidic conditions. The matrix-assisted laser desorption ionization-time of flight mass spectrometry was used for evaluation of complexes in eluate liquid fraction. The structures of complexes were modeled by Titan, Spartan and HyperChem software. The findings obtained satisfactorily explain the chromatographic data and could provide useful an additional data about these forms in which is present trans-resveratrol in wine (free and/or forming complex with copper).
Subject(s)
Chromatography, High Pressure Liquid/methods , Copper/chemistry , Organometallic Compounds/analysis , Organometallic Compounds/chemistry , Stilbenes/analysis , Stilbenes/chemistry , Resveratrol , Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization , Wine/analysisABSTRACT
Chromatographic behavior of two main classes of neuroleptics, derivatives of phenothiazine and thioxanthene in RP systems modified by anionic additives: sodium perchlorate and sodium hexafluorophosphate possessing chaotropic properties, was examined. Influence of the method of pH lowering (by addition of acids: trifluoroacetic or perchloric or by adding the appropriate concentration of phosphate buffer) and the kind of organic modifier in the mobile phase (methanol, acetonitrile) were estimated. Stability of complexes created between protonated drugs and anions of added salts was evaluated by comparison of their desolvation parameters (K), limiting retention factors for unsolved molecules calculated on the basis of chromatographic data. Experimentally obtained parameters were used in QSAR studies. It appeared that chosen parameters reflect not only physico-chemical properties of analytes but also contain information about the strength of their antipsychotic activity. Multidimensional cluster analysis has been performed. On the basis of the results obtained, it could be concluded that chaotropic systems can generate useful parameters for further QSAR studies.
Subject(s)
Antipsychotic Agents/analysis , Phenothiazines/analysis , Thioxanthenes/analysis , Chemical Phenomena , Chemistry, Physical , Chromatography, High Pressure Liquid , Indicators and Reagents , Perchlorates/chemistry , Quantitative Structure-Activity Relationship , Sodium Compounds/chemistry , SolventsABSTRACT
Salting-out thin-layer chromatography of several chosen sulphonamides on silica gel has been examined with aqueous solutions of salts: sulphates, chlorides, nitrates, phosphates, acetates, thiocyanates. It was established that applied salts have different effects on retention of sulphonamides accordingly to Hofmeister's clasification (e.g. kosmotropes, chaotropes and neutral). The parameters of the linear regression analysis of dependences between the R(M) values and concentration of the salt in the eluent system were correlated with QSAR ones. It appeared that chromatographic parameters obtained by SOTLC method reflect not only physico-chemical properties of examined compounds but also they include information about their activity. 3D graph revealing pharmacological properties of analytes was constructed. Universal character of this method for predicting and classification of drug containing sulphonamide group was confirmed by localisation of additional compounds structurally similar but acting antagonistically towards sulphonamides.
