Metallic colloid wavelength-ratiometric scattering sensors

David Roll, Joanna Malicka, Ignacy Gryczynski, Zygmunt Gryczynski, Joseph R. Lakowicz

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Gold and silver colloids display strong colors as a result of electron oscillations induced by incident light, which are referred to as the plasmon absorption. This absorption is dependent on colloid-colloid proximity, which has been the basis of absorption assays using colloids. We now describe a new approach to optical sensing using the light scattering properties of colloids. Colloid aggregation was induced by avidin-biotin interactions, which shifted the plasmon absorption to longer wavelengths. We found the spectral shift results in changes in the scattering at different incident wavelengths. By measuring the ratio of scattered intensities at two incident wavelengths, this measurement was made independent of the total colloid concentration. The high scattering efficiency of the colloids resulted in intensities equivalent to fluorescence when normalized by the optical density of the fluorophore and colloid. This approach can be used in a wide variety of assay formats, including those commonly used with fluorescence detection.

Original languageEnglish
Pages (from-to)3440-3445
Number of pages6
JournalAnalytical Chemistry
Volume75
Issue number14
DOIs
StatePublished - 15 Jul 2003

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Colloids
Scattering
Wavelength
Sensors
Assays
Fluorescence
Gold Colloid
Density (optical)
Avidin
Fluorophores
Biotin
Light scattering
Agglomeration
Color
Electrons

Cite this

Roll, David ; Malicka, Joanna ; Gryczynski, Ignacy ; Gryczynski, Zygmunt ; Lakowicz, Joseph R. / Metallic colloid wavelength-ratiometric scattering sensors. In: Analytical Chemistry. 2003 ; Vol. 75, No. 14. pp. 3440-3445.
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Metallic colloid wavelength-ratiometric scattering sensors. / Roll, David; Malicka, Joanna; Gryczynski, Ignacy; Gryczynski, Zygmunt; Lakowicz, Joseph R.

In: Analytical Chemistry, Vol. 75, No. 14, 15.07.2003, p. 3440-3445.

Research output: Contribution to journalArticle

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