Simultaneous multiple enantioseparation with a one-pot imprinted microfluidic channel by microchip capillary electrochromatography

Analyst. 2011 Mar 7;136(5):920-6. doi: 10.1039/c0an00559b. Epub 2010 Nov 29.

Abstract

A multi-template imprinted microchannel was prepared by a one-pot in situ imprinting process. The imprinted microchannel led to a novel chip-based strategy for simultaneous multiple enantioseparation. The one-pot imprinting process formed a multi-template imprinted porous thin layer (about 2 μm) on the inner wall of the capillary, which was characterized by scanning electron microscopy, infrared spectroscopy, and solid-state UV-vis spectroscopy. By fixing the imprinted capillary to a support substrate composed of poly(dimethylsiloxane) on a glass slide, a multi-analyte microchip was thus conveniently constructed. Using L-tyrosine (L-Tyr) and L-tryptophan (L-Trp) as the template molecules, two pairs of enantiomers were simultaneously baseline separated in a 6 cm separation channel within 120 s under the optimized preparation and electrochromatographic conditions. The separation showed excellent efficiency. The linear ranges for amperometric detection of four analytes using a carbon fiber microdisk electrode at +1.2 V (vs. Ag/AgCl) were from 20 to 500 μM for racemic Tyr and Trp. This multi-template imprinting strategy could be expanded for simultaneous separation and detection of additional pairs of enantiomers within a short analytical time. It could open up a promising avenue for high-throughput screening of chiral compounds.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Capillary Electrochromatography / methods*
  • Carbon / chemistry
  • Carbon Fiber
  • Electrodes
  • Microfluidic Analytical Techniques / methods*
  • Stereoisomerism
  • Time Factors
  • Tryptophan / analysis*
  • Tryptophan / chemistry
  • Tryptophan / isolation & purification
  • Tyrosine / analysis*
  • Tyrosine / chemistry
  • Tyrosine / isolation & purification

Substances

  • Carbon Fiber
  • Tyrosine
  • Carbon
  • Tryptophan