Plastic versus glass support for an immunoassay on metal-coated surfaces in optically eense samples utilizing directional surface plasmon-coupled emission

Evgenia G. Matveeva, Ignacy Gryczynski, Joanna Malicka, Zygmunt Gryczynski, Ewa Goldys, Joseph Howe, Klaus W. Berndt, Joseph R. Lakowicz

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We compared plastic (polycarbonate) and high-quality glass support materials for gold-coated slides, when performing a model immunoassay against rabbit IgG using fluorescently labeled (AlexaFluor-647) anti-rabbit IgG, and detecting surface plasmon-coupled emission (SPCE) signals. Both, glass and plastic slides were simultaneously coated with a 48-nm layer of gold and protected with a 10-nm layer of silica. The maximum SPCE signal of AlexaFluor-647 was only two- to three-fold smaller on plastic slides than on glass slides. A small difference in the SPCE angles on glass (θ F∈=∈55°) and plastic (θ F∈= ∈52.5°) slides was observed and can be explained with a slightly smaller refractive index of the plastic. We have not found any difference in the angle distribution (sharpness of the fluorescence signal at optimal SPCE angle) for the plastic slide compared to the glass slide. The kinetics of binding was monitored on the plastic slide as well as on the glass slide. Optically dense samples, a 4% red blood cell suspension and a 15% hemoglobin solution, are causing a reduction in the immunoassay SPCE signal by approximately 15% and three times, respectively, and the percentage of the reduction is the same for plastic and for glass slides. We believe that plastic substrates can be readily used in any SPCE assay, with only marginally lower total signal compared to high-quality glass slides.

Original languageEnglish
Pages (from-to)865-871
Number of pages7
JournalJournal of Fluorescence
Volume15
Issue number6
DOIs
StatePublished - 1 Nov 2005

Fingerprint

Immunoassay
Plastics
Glass
Metals
gold
Gold
Immunoglobulin G
Rabbits
Refractometry
Silicon Dioxide
Assays
Refractive index
Suspensions
Hemoglobins
Blood
Erythrocytes
Fluorescence
Cells
Kinetics
Substrates

Keywords

  • Background suppression
  • Fluorescence immunoassay
  • Glass slides
  • Gold film
  • Plastic slides
  • Surface plasmon-coupled emission

Cite this

Matveeva, Evgenia G. ; Gryczynski, Ignacy ; Malicka, Joanna ; Gryczynski, Zygmunt ; Goldys, Ewa ; Howe, Joseph ; Berndt, Klaus W. ; Lakowicz, Joseph R. / Plastic versus glass support for an immunoassay on metal-coated surfaces in optically eense samples utilizing directional surface plasmon-coupled emission. In: Journal of Fluorescence. 2005 ; Vol. 15, No. 6. pp. 865-871.
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Plastic versus glass support for an immunoassay on metal-coated surfaces in optically eense samples utilizing directional surface plasmon-coupled emission. / Matveeva, Evgenia G.; Gryczynski, Ignacy; Malicka, Joanna; Gryczynski, Zygmunt; Goldys, Ewa; Howe, Joseph; Berndt, Klaus W.; Lakowicz, Joseph R.

In: Journal of Fluorescence, Vol. 15, No. 6, 01.11.2005, p. 865-871.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Plastic versus glass support for an immunoassay on metal-coated surfaces in optically eense samples utilizing directional surface plasmon-coupled emission

AU - Matveeva, Evgenia G.

AU - Gryczynski, Ignacy

AU - Malicka, Joanna

AU - Gryczynski, Zygmunt

AU - Goldys, Ewa

AU - Howe, Joseph

AU - Berndt, Klaus W.

AU - Lakowicz, Joseph R.

PY - 2005/11/1

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AB - We compared plastic (polycarbonate) and high-quality glass support materials for gold-coated slides, when performing a model immunoassay against rabbit IgG using fluorescently labeled (AlexaFluor-647) anti-rabbit IgG, and detecting surface plasmon-coupled emission (SPCE) signals. Both, glass and plastic slides were simultaneously coated with a 48-nm layer of gold and protected with a 10-nm layer of silica. The maximum SPCE signal of AlexaFluor-647 was only two- to three-fold smaller on plastic slides than on glass slides. A small difference in the SPCE angles on glass (θ F∈=∈55°) and plastic (θ F∈= ∈52.5°) slides was observed and can be explained with a slightly smaller refractive index of the plastic. We have not found any difference in the angle distribution (sharpness of the fluorescence signal at optimal SPCE angle) for the plastic slide compared to the glass slide. The kinetics of binding was monitored on the plastic slide as well as on the glass slide. Optically dense samples, a 4% red blood cell suspension and a 15% hemoglobin solution, are causing a reduction in the immunoassay SPCE signal by approximately 15% and three times, respectively, and the percentage of the reduction is the same for plastic and for glass slides. We believe that plastic substrates can be readily used in any SPCE assay, with only marginally lower total signal compared to high-quality glass slides.

KW - Background suppression

KW - Fluorescence immunoassay

KW - Glass slides

KW - Gold film

KW - Plastic slides

KW - Surface plasmon-coupled emission

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