The enantioselective complexation of sulpiride by a number of cyclodextrins (CDs) was deeply investigated by different techniques with the aim of evaluating the role of the used chiral selectors involved in the enantioseparation of the eutomer levosulpiride (S-SUL) and its dextro-isomer by capillary electrophoresis (CE). A CE method was previously developed with the aim of determining the optical purity of S-SUL and was based on the use of a dual cyclodextrin system, made by sulfated-cyclodextrin (SCD) and methyl-cyclodextrin (MCD). In this paper, a molecular modeling study made it possible to explain the different affinity of sulpiride enantiomers for several CDs, which had been tested during the early phase of CE method development. The potential and the gain energy of the inclusion complexes between the enantiomers and neutral and charged CDs were calculated on the minimized conformations. The calculated docking energies indicated that the most stable complexes were effectively obtained with SCD and MCD. A correlation between CE migration time of the last migrating enantiomer S-SUL and the stability of analyte-neutral CDs complexes was postulated. Furthermore, two-dimensional rotating-frame Overhauser effect spectroscopy NMR (2-D ROESY) experiments were carried out, which clearly indicated the formation of complexes and suggested the inclusion of the benzene sulfonamide moiety of S-SUL inside the hydrophobic cavity of the CDs.
Combination of capillary electrophoresis, molecular modeling and NMR to study the enantioselective complexation of sulpiride with double cyclodextrin systems / Melani, Fabrizio; Pasquini, Benedetta; Caprini, Claudia; Gotti, Roberto; Orlandini, Serena; Furlanetto, Sandra. - In: JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS. - ISSN 0731-7085. - STAMPA. - 114:(2015), pp. 265-271. [10.1016/j.jpba.2015.05.031]
Combination of capillary electrophoresis, molecular modeling and NMR to study the enantioselective complexation of sulpiride with double cyclodextrin systems
MELANI, FABRIZIO;PASQUINI, BENEDETTA;CAPRINI, CLAUDIA;ORLANDINI, SERENA;FURLANETTO, SANDRA
2015
Abstract
The enantioselective complexation of sulpiride by a number of cyclodextrins (CDs) was deeply investigated by different techniques with the aim of evaluating the role of the used chiral selectors involved in the enantioseparation of the eutomer levosulpiride (S-SUL) and its dextro-isomer by capillary electrophoresis (CE). A CE method was previously developed with the aim of determining the optical purity of S-SUL and was based on the use of a dual cyclodextrin system, made by sulfated-cyclodextrin (SCD) and methyl-cyclodextrin (MCD). In this paper, a molecular modeling study made it possible to explain the different affinity of sulpiride enantiomers for several CDs, which had been tested during the early phase of CE method development. The potential and the gain energy of the inclusion complexes between the enantiomers and neutral and charged CDs were calculated on the minimized conformations. The calculated docking energies indicated that the most stable complexes were effectively obtained with SCD and MCD. A correlation between CE migration time of the last migrating enantiomer S-SUL and the stability of analyte-neutral CDs complexes was postulated. Furthermore, two-dimensional rotating-frame Overhauser effect spectroscopy NMR (2-D ROESY) experiments were carried out, which clearly indicated the formation of complexes and suggested the inclusion of the benzene sulfonamide moiety of S-SUL inside the hydrophobic cavity of the CDs.File | Dimensione | Formato | |
---|---|---|---|
2015_Melani-F._J. Pharm. Biomed. Anal..pdf
Accesso chiuso
Descrizione: Articolo principale
Tipologia:
Altro
Licenza:
Tutti i diritti riservati
Dimensione
992.96 kB
Formato
Adobe PDF
|
992.96 kB | Adobe PDF | Richiedi una copia |
I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.