Fluorescent sensing of homocysteine by molecular imprinting

Cheuk Fai Stephen CHOW, Michael H.W LAM, Mitch K.P LEUNG

Research output: Contribution to journalArticles

43 Citations (Scopus)

Abstract

The feasibility of biomimetic molecular sensing of homocysteine, an independent risk factor for cardiovascular diseases, was studied. The sensing approach coupled fluorescent derivatization of dl-homocysteine by a thiol-specific fluoro-tagging agent, N-(1-pyrenyl)maleimide, with molecular recognition by a molecularly imprinted polymer (MIP) matrix. The non-covalent MIP was fabricated using the N-(1-pyrenyl)maleimide-dl-homocysteine (PM-H) adduct as template. The PM-H–MIP was found to possess outstanding analyte-specific affinity for PM-H with binding constant, KB, of 9.28±1.6×105 M−1 and density of recognition sites, Bmax, of 11.9±0.8 nmol/g dried MIP. Following in situ fluorescent derivatization, luminescent response of the MIP was found to correlate linearly with concentration of dl-homocysteine in the range corresponding to realistic total homocysteine concentration in blood plasma. Besides being a passive recognition matrix for the binding of the fluoro-tagged analyte, the PM-H–MIP material was found to be able to specifically enhance the rate of derivatization reaction between dl-homocysteine and N-(1-pyrenyl)maleimide. In a sense, the MIP transformed a fluoro-tagging agent, which is generally reactive towards a broad spectrum of thiol-containing species, into a dl-homocysteine-specific derivatizing agent. The mechanism of such analyte-specific enhancement of derivatization rate and its advantages to the biomimetic molecular sensing are discussed. Copyright © 2002 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)17-30
JournalAnalytica Chimica Acta
Volume466
Issue number1
DOIs
Publication statusPublished - Aug 2002

Citation

Chow, C.-F., Lam, M. H. W., & Leung, M. K. P. (2002). Fluorescent sensing of homocysteine by molecular imprinting. Analytica Chimica Acta, 466(1), 17-30. doi: 10.1016/S0003-2670(02)00520-2

Keywords

  • Homocysteine
  • Molecular imprinting
  • Biomimetic sensing
  • Fluoro-tagging

Fingerprint Dive into the research topics of 'Fluorescent sensing of homocysteine by molecular imprinting'. Together they form a unique fingerprint.