Surface plasmon resonance spectroscopic chiral discrimination using self-assembled leucine derivative monolayer

Talanta. 2008 Jun 30;76(1):49-53. doi: 10.1016/j.talanta.2008.02.001. Epub 2008 Feb 15.

Abstract

Pirkle-type chiral stationary phases (CSPs) showed excellent enantiomeric separation for amino acid derivatives by forming energetically different two transient diastereomeric pi-pi donor-acceptor complexes with two enantiomers. A CSP derived from N-(3,5-dinitrobenzoyl) leucine with a thiol ending group for immobilization on Au was synthesized and self-assembled on Au surface as chiral sensing layer. The monolayer characterized by spectroscopic and microscopic methods such as AFM, FTIR reflection absorption spectroscopy (FTIR-RAS) and cyclic voltammetry (CV). The enantiospecific detection onto CSP of the leucine derivative was studied by surface plasmon resonance (SPR). (S)-CSP SAM showed high chiral differential detection for (S)-analyte in a range of 1.0x10(-9) to 1.0x10(-4) M. In combination with the SPR method, the leucine derivative monolayer provided a reliable and simple experimental platform for enantiospecific detection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Absorption
  • Leucine / analogs & derivatives*
  • Leucine / chemistry*
  • Sensitivity and Specificity
  • Spectroscopy, Fourier Transform Infrared
  • Stereoisomerism
  • Surface Plasmon Resonance / methods*

Substances

  • Leucine