Immunoassays based on directional surface plasmon-coupled emission

Evgenia Matveeva, Zygmunt Gryczynski, Ignacy Gryczynski, Joseph R. Lakowicz

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

We described a new approach to immunoassays using surface plasmon-coupled emission (SPCE). Fluorescence is visually isotropic in space, so that the sensitivity is limited in part by the light collection efficiency. By the use of SPCE, we can efficiently collect the emission and convert it to a cone-like directional beam in a glass substrate. SPCE is the coupling of excited fluorophores with a thin metal film, resulting in radiation of surface plasmons into the higher refractive index media. We used SPCE to develop a model affinity assay using labeled goat anti-rabbit immunoglobulin G (IgG) antibodies against rabbit IgG bound to a 50-nm-thick silver film. Binding of labeled IgG to the surface resulted in increased intensity observed at an angle of 75°from the normal in the glass substrate. The SPCE intensity depends on proximity of the fluorophore to the silver film and does not require a change in quantum yield upon binding. The use of SPCE is shown to provide background suppression because excited fluorophores distant from the silver film do not result in SPCE. Sensitivity and selectivity can be further increased by excitation under conditions of surface plasmon resonance (SPR) because the evanescent field is enhanced by the resonance interaction and excitation is limited to the region near the metal. We believe SPCE will provide a new technology for high sensitivity and selectivity in surface-bound assays and microfluidic systems.

Original languageEnglish
Pages (from-to)133-140
Number of pages8
JournalJournal of Immunological Methods
Volume286
Issue number1-2
DOIs
StatePublished - 1 Mar 2004

Fingerprint

Immunoassay
Silver
Immunoglobulin G
Glass
Metals
Rabbits
Refractometry
Microfluidics
Surface Plasmon Resonance
Goats
Fluorescence
Radiation
Technology
Light
Antibodies

Keywords

  • Background suppression
  • Bovine hemoglobin solution
  • Fluorescence immunoassay
  • HbBv
  • IgG
  • Immunoglobulin G
  • KR
  • Kretschmann configuration
  • OD
  • Optical density
  • RET
  • RK
  • Resonance energy transfer
  • Silver film
  • Surface plasmon-coupled emission

Cite this

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title = "Immunoassays based on directional surface plasmon-coupled emission",
abstract = "We described a new approach to immunoassays using surface plasmon-coupled emission (SPCE). Fluorescence is visually isotropic in space, so that the sensitivity is limited in part by the light collection efficiency. By the use of SPCE, we can efficiently collect the emission and convert it to a cone-like directional beam in a glass substrate. SPCE is the coupling of excited fluorophores with a thin metal film, resulting in radiation of surface plasmons into the higher refractive index media. We used SPCE to develop a model affinity assay using labeled goat anti-rabbit immunoglobulin G (IgG) antibodies against rabbit IgG bound to a 50-nm-thick silver film. Binding of labeled IgG to the surface resulted in increased intensity observed at an angle of 75°from the normal in the glass substrate. The SPCE intensity depends on proximity of the fluorophore to the silver film and does not require a change in quantum yield upon binding. The use of SPCE is shown to provide background suppression because excited fluorophores distant from the silver film do not result in SPCE. Sensitivity and selectivity can be further increased by excitation under conditions of surface plasmon resonance (SPR) because the evanescent field is enhanced by the resonance interaction and excitation is limited to the region near the metal. We believe SPCE will provide a new technology for high sensitivity and selectivity in surface-bound assays and microfluidic systems.",
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Immunoassays based on directional surface plasmon-coupled emission. / Matveeva, Evgenia; Gryczynski, Zygmunt; Gryczynski, Ignacy; Lakowicz, Joseph R.

In: Journal of Immunological Methods, Vol. 286, No. 1-2, 01.03.2004, p. 133-140.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Immunoassays based on directional surface plasmon-coupled emission

AU - Matveeva, Evgenia

AU - Gryczynski, Zygmunt

AU - Gryczynski, Ignacy

AU - Lakowicz, Joseph R.

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KW - Kretschmann configuration

KW - OD

KW - Optical density

KW - RET

KW - RK

KW - Resonance energy transfer

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KW - Surface plasmon-coupled emission

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SN - 0022-1759

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