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Chromatographic and Spectroscopic Studies on β-Cyclodextrin Functionalized Ionic Liquid as Chiral Stationary Phase: Enantioseparation of Flavonoids

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Abstract

In this study, β-cyclodextrin functionalized ionic liquid was prepared by adding 1-benzylimidazole onto 6-monotosyl-6-deoxy-β-cyclodextrin (β-CDOTs) to obtain β-CD-BIMOTs. β-CD-BIMOTs were then bonded onto the modified silica to produce chiral stationary phases (β-CD-BIMOTs-CSP). The performance of β-CD-BIMOTs-CSP was evaluated by observing the enantioseparation of flavonoids. The performance of β-CD-BIMOTs stationary phase was also compared with native β-CD stationary phase. For the selected flavonoids, flavanone and hesperetin obtained a high resolution factor in reverse phase mode. Meanwhile, naringenin and eriodictyol attained partial enantioseparation in polar organic mode. In order to understand the mechanism of separation, the interaction of selected flavonoids and β-CD-BIMOTs was studied using spectroscopic methods (1H NMR, NOESY and UV–Vis spectrophotometry). The enantioseparated flavanone and hesperetin were found to form an inclusion complex with β-CD-BIMOTs. However, naringenin and eriodictyol were not enantioseparated due to the formation of hydrogen bonding at exterior torus of β-CD-BIMOTs.

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Acknowledgments

Authors would like to seize this opportunity to express their gratitude to the University Malaya for the IPPP Grant (PG027/2013A) and UMRG Grant (RP006A–13SUS, RP020A–16SUS and RP011B–14SUS). The authors also acknowledge Ministry of Higher Education (MOHE) for providing fellowship to one of the authors-cum-researchers, Ms. NurulYani Rahim.

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Correspondence to Sharifah Mohamad.

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Rahim, N.Y., Tay, K.S. & Mohamad, S. Chromatographic and Spectroscopic Studies on β-Cyclodextrin Functionalized Ionic Liquid as Chiral Stationary Phase: Enantioseparation of Flavonoids. Chromatographia 79, 1445–1455 (2016). https://doi.org/10.1007/s10337-016-3169-y

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  • DOI: https://doi.org/10.1007/s10337-016-3169-y

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