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Gold nanoparticles coated with a tetramethylammonium lactobionate ionic liquid for enhanced chiral differentiation in open tubular capillary electrochromatography: application to enantioseparation of β-blockers

Abstract

A new bilayer chiral stationary phase for use in open tubular capillary electrochromatography (OT-CEC) system is described. Gold nanoparticles were modified with L-cysteine, with a tetramethylammonium lactobionate ionic liquid that acts as the chiral selector. The gold nanoparticle-coated column provides good enantioseparation and favorable reproducibility. Compared with an uncoated separation system, the column developed displays improved separation of the racemic β-blockers propranolol, esmolol, bisoprolol and sotalol (resolutions of enotiomers are 6.29, 6.11, 6.12 and 6.02, respectively). The materials and coatings were characterized by scanning electron microscopy and transmission electron microscopy. The main driving forces (CEC and electro-osmotic flow) were studied to evaluate the variation of the immobilized columns. The effects of buffer pH value, concentration of chiral selector, type of organic modifier and applied voltage were optimized. Satisfactory relative standard deviations were achieved in run-to-run, day-to-day and column-to-column experiments.

Schematic preparation of a capillary column with bilayer chiral selectors coated gold nanoparticles. This novel OT-CEC system was applied for separation of four basic racemic β-blockers.

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Acknowledgements

This work was supported by the Natural Science Foundation of Jiangsu Province (Program No.:BK20141353).

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Correspondence to Yingxiang Du.

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Sun, X., Chen, C., Li, X. et al. Gold nanoparticles coated with a tetramethylammonium lactobionate ionic liquid for enhanced chiral differentiation in open tubular capillary electrochromatography: application to enantioseparation of β-blockers. Microchim Acta 187, 170 (2020). https://doi.org/10.1007/s00604-020-4121-2

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Keywords

  • GNPs coated column
  • Tetramethylammonium-lactobionate
  • Bilayer chiral coating
  • L-cysteine
  • Carboxymethyl-β-cyclodextrin
  • Capillary electrochromatography
  • Open tubular capillary