Device and method for carrying out fluorescence immunoassays

G - Physics – 01 – N

Patent

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Details

G01N 21/77 (2006.01) G01N 21/64 (2006.01) G01N 33/53 (2006.01) G01N 33/543 (2006.01) G01N 33/58 (2006.01)

Patent

CA 2283251

The invention relates to a device and a method for carrying out quantitative fluorescence immunoassays by means of evanescent field excitation. Various known biochemical assays of general receptor-ligand systems can be used. For this purpose, light of at least one light source is directed at an angle .alpha. onto the boundary surface of two media which have different refractive indices. A light source is selected which emits substantially monochromatic light with a wavelength which is suitable for exciting a marking substance. The light is directed onto the boundary surface which is disposed between an optically transparent base plate made of a material where the refractive index n1 is greater than the refractive index n2 of the material above the boundary surface, and a cuvette-shaped receiving region for the sample. The receiving region is covered with a covering plate on the side disposed opposite the base plate. Arranged between base plate and covering plate is at least one functional layer and a detector for detecting the fluorescent light being disposed on the same side of the base plate as the light source.

L'invention concerne un dispositif et une méthode qui permettent d'effectuer notamment des analyses immunologiques quantitatives par fluorescence en excitant un champ évanescent. On peut partir de la plupart des analyses biochimiques connues basées sur divers systèmes généraux récepteur-ligand. On dirige un faisceau lumineux provenant d'au moins une source de lumière selon un angle alpha sur l'interface entre deux milieux ayant un indice de réfraction différent. On choisit une source de lumière émettant une lumière sensiblement monochromatique dont la longueur d'onde convient pour exciter un marqueur. On dirige la lumière sur une interface (20) entre une plaque-support (1) optiquement transparente, dont l'indice de réfraction n1 est supérieur à l'indice de réfraction n2 du matériau situé au-dessus de ladite interface (20), et une zone réceptrice (2) en forme de cuvette destinée à l'échantillon. On recouvre la zone réceptrice (2), du côté opposé à la plaque-support (1), par une plaque obturatrice (3). Entre la plaque-support (1) et la plaque obturatrice (3) sont disposés au moins une couche fonctionnelle (26, 27, 28, 28', 29) et un détecteur (5) permettant de détecter la lumière fluorescente des deux côtés de la plaque-support (1), suivant l'endroit où est placée la source de lumière.

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