Nature of the interaction between a peptidolipid Langmuir monolayer and paraoxon in the subphase

Chengshan Wang, Jiayin Zheng, Osvaldo N. Oliveira, Roger Leblanc

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Surface potential and Infrared Reflection-absorption spectroscopy (IRRAS) measurements have been used to investigate the interaction between a peptidolipid (stearoyl-Phe-Trp-Ser-His-Glu) Langmuir monolayer and paraoxon aqueous solution as subphase. The molecular recognition in this system involved π-π interactions between the nitrobenzene group of paraoxon and aromatic groups in the peptidolipid. Of particular importance was the dependence of the surface potential on the concentration of paraoxon. Effects were practically negligible for 1.0 × 10-5 and 1.0 × 10-6 M paraoxon concentrations, but the Langmuir monolayer surface potential dropped due to the interaction with paraoxon at a concentration equal or higher than 1.0 Times; 10-4 M. At 1.5 × 10-3 M, the surface potential-area (ΔV-A) isotherm for the peptidolipid displayed an unusual shape, with an almost constant, near-zero surface potential during the monolayer compression. This was interpreted on the basis of IRRAS results as being due to reorientation of the benzene ring of paraoxon, which changed from parallel to the air-water interface in the absence of a monolayer to a tilted orientation upon interacting with the peptidolipid monolayer.

Original languageEnglish
Pages (from-to)7826-7833
Number of pages8
JournalJournal of Physical Chemistry C
Volume111
Issue number21
DOIs
StatePublished - May 31 2007

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Paraoxon
monomolecular films
Surface potential
Monolayers
infrared reflection
Absorption spectroscopy
interactions
absorption spectroscopy
Infrared radiation
Molecular recognition
Nitrobenzene
nitrobenzenes
retraining
Isotherms
Benzene
isotherms
benzene
aqueous solutions
rings
air

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Nature of the interaction between a peptidolipid Langmuir monolayer and paraoxon in the subphase. / Wang, Chengshan; Zheng, Jiayin; Oliveira, Osvaldo N.; Leblanc, Roger.

In: Journal of Physical Chemistry C, Vol. 111, No. 21, 31.05.2007, p. 7826-7833.

Research output: Contribution to journalArticle

Wang, Chengshan ; Zheng, Jiayin ; Oliveira, Osvaldo N. ; Leblanc, Roger. / Nature of the interaction between a peptidolipid Langmuir monolayer and paraoxon in the subphase. In: Journal of Physical Chemistry C. 2007 ; Vol. 111, No. 21. pp. 7826-7833.
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