Adsorption of ibuprofen and dopamine on functionalized gold using surface plasmon resonance spectroscopy at solid-liquid interface

Dániel Sebok, Edit Csapó, Tajana Preocanin, Gabriella Bohus, Nikola Kallay, Imre Dékány

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Ultrathin gold nanofilms (50 nm) are suitable for detection of adsorbed molecules at solidliquid interface of various sizes due to their surface plasmon resonance (SPR) properties. This SPR technique makes it possible to study the surface adsorption in nanomol range amount on gold surfaces of a maximum of one mm2 and to determine the adsorbed amount as a function of equilibrium concentration. Adsorption of L-cysteine, L-glutathione, ibuprofen and dopamine on the gold surface was examined. Moreover, the binding capability of ibuprofen and dopamine molecules on the gold surface functionalized by L-cysteine and L-glutathione was studied as well. Adsorption isotherms were recorded using the flow measuring technique, which allows determination of the amount of adsorbed material even in the nmol/cm2 order of magnitude, the cross sectional areas of adsorbed molecules. The adsorption enthalpies (isosteric heat of adsorption) were determined from adsorption isotherms at different temperatures. The surface orientations of the studied molecules were analyzed by MarvinSketch program.

Original languageEnglish
Pages (from-to)287-295
Number of pages9
JournalCroatica Chemica Acta
Volume86
Issue number3
DOIs
Publication statusPublished - Nov 2013

Keywords

  • Adsorption
  • Dopamine
  • Functionalization
  • Gold thin film
  • Ibuprofen
  • L-cysteine
  • L-glutathione
  • Surface plasmon resonance

ASJC Scopus subject areas

  • Chemistry(all)

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