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Capillary Electrophoresis: Applications01:30

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A covalent organic framework for chiral capillary electrochromatography using a cyclodextrin mobile phase additive.

Lidi Gao1, Xuan Zhao1, Shili Qin1

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Covalent organic frameworks (COFs) show promise for capillary electrochromatography (CEC). A COF TpBD-coated open-tubular column achieved high efficiency for enantioseparation of diverse chiral compounds using a combined CEC and CE method.

Keywords:
capillary electrochromatographycapillary electrophoresischiral separationcovalent organic frameworksopen-tubular columnβ-cyclodextrin

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Covalent organic frameworks (COFs) are emerging as effective stationary phases for capillary electrochromatography (CEC).
  • Imine-based COF materials offer unique properties for chromatographic separations.

Purpose of the Study:

  • To develop and characterize a novel imine-based COF-coated open-tubular capillary electrochromatography column.
  • To evaluate the enantioseparation capabilities of the developed COF column using various chiral compounds and compare it with other methods.

Main Methods:

  • Preparation and characterization of an imine-based COF-coated open-tubular CEC column (COF TpBD-coated OT column) using XRD, FT-IR, TGA, BET, and SEM.
  • Enantioseparation of 15 single chiral compounds and 3 mixed amino acid racemates via CEC with the COF column, and capillary electrophoresis (CE) with HP-β-CD as a chiral additive.
  • Optimization of separation conditions for Method 2 (CEC with COF column and CE with HP-β-CD).

Main Results:

  • The COF TpBD-coated OT column exhibited high efficiency (up to 26,776 plates/m) with a stationary phase thickness of approximately 6.00 μm under optimal conditions.
  • Method 2, combining CEC with the COF column and CE with HP-β-CD, demonstrated superior separation efficiency and chiral selectivity compared to other methods.
  • Baseline separation of all tested enantiomers, including single compounds and mixed amino acid racemates, was achieved under optimized conditions of Method 2.
  • Excellent reproducibility and stability were confirmed, with relative standard deviations for column efficiency ranging from 0.46% to 1.49%.

Conclusions:

  • The developed COF TpBD-coated OT column is a highly efficient stationary phase for enantioseparation in CEC.
  • The combined CEC and CE approach using the COF column and HP-β-CD offers significant potential for chiral separation applications.
  • This method provides a robust and effective platform for the analysis of chiral compounds with high resolution and reproducibility.