Multi-wavelength immunoassays using surface plasmon-coupled emission.

Abstract:

:We describe a new method for multi-wavelength immunoassays using surface plasmon-coupled emission (SPCE). This phenomenon is coupling of excited fluorophores with a nearby thin metal film, in our case silver, resulting in strongly directional emission into the underlying glass substrate. The angle at which the radiation propagate through the prism depends on the surface plasmon angle for the relevant wavelength. These angles depend on emission wavelength, allowing measurement of multiple analytes using multiple emission wavelengths. We demonstrated this possibility using antibodies labeled with either Rhodamine Red-X or AlexaFluor 647. These antibodies were directed against an antigen protein bound to the silver surface. The emission from each labeled antibody occurred at a different angle on the glass prism, allowing independent measurement of surface binding of each antibody. This method of SPCE immunoassays can be readily extended to 4 or more wavelengths.

authors

Matveeva E,Malicka J,Gryczynski I,Gryczynski Z,Lakowicz JR

doi

10.1016/j.bbrc.2003.12.010

subject

Has Abstract

pub_date

2004-01-16 00:00:00

pages

721-6

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006291X03025981

journal_volume

313

pub_type

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