β-Cyclodextrin functionalized ionic liquid as chiral stationary phase of high performance liquid chromatography for enantioseparation of β-blockers

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• 作者：Nurul Yani Rahim ; Kheng Soo Tay…
• 刊名：Journal of Inclusion Phenomena and Macrocyclic Chemistry
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：85
• 期：3-4
• 页码：303-315
• 全文大小：1,469 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Organic Chemistry
  Food Science
  Crystallography
  
• 出版者：Springer Netherlands
• ISSN：1573-1111
• 卷排序：85

文摘

Two covalently bonded β-Cyclodextrin (β-CD) based CSPs were prepared by immobilizing the native β-CD and mono-6-deoxy-6-(3-benzylimidazolium tosylate)-β-CD (β-CD-BIMOTs) onto modified silica gel. β-CD-BIMOTs is a β-CD based CSP with ionic liquid (3-benzylimidazolium tosylate) substituent. The enantioseparation capability of the synthesized CSPs was examined using 4 racemic mixtures of β-blockers (propranolol, metoprolol, pindolol and atenolol). The results indicated that β-CD-BIMOTs based CSP afforded more favorable enantioseparations than native β-CD based CSP. In order to study the mechanism of enantioseparation, inclusion complexes β-CD-BIMOTs and β-blockers were prepared and these inclusion complexes were characterized by using 1H NMR and NOESY. In addition, the separation conditions such as pH and composition of mobile phase were varied to study the role of β-CD and ionic liquid in enantioseparation. In general, it can be concluded that the complete enantioseparation of propranolol and metoprolol is achieved through the formation of inclusion complex with β-CD-BIMOTs and the formation π-π interaction with the ionic liquid moiety of β-CD-BIMOTs. The result also showed the poor enantioseparation of pindolol and atenolol on the β-CD-BIMOTs based CSP due to the strong interaction at the exterior torus of β-CD-BIMOTs.KeywordsCyclodextrinIonic LiquidEnantiorecognitionChiralInclusion complex