Process and device for carrying out quantitative,...

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G01N 33/543 (2006.01) G01N 21/03 (2006.01) G01N 21/55 (2006.01) G01N 21/64 (2006.01)

Patent

CA 2260095

A process and device are disclosed for carrying out in particular quantitative fluorescence immunity tests by means of evancacent field excitation, possibly on the basis of various known biochemical assays of systems generally composed of receptor-ligands. However, antibody-antigen systems are preferably evaluated. The invention should enable quantitative fluorescence immunity tests with various known biochemical assays to be carried out with a very simple device. For that purpose, a light source (7, 7) is used which emits rays of an almost monochromatic light having a wavelength which causes a marking substance bound to the antibody to become fluorescent. The light rays are directed at an angle .alpha. determined by a depth of penetration d previously determined for the evanescent field onto a boundary surface (20) between an optically transparent base plate (i) made of a material with a refraction index n1 higher than the refraction index n2 of the material above the boundary surface (20) and a cuvette-shaped sample-receiving area (2). The sample receiving area (2) is covered at the side opposite to the base plate (1) by a covering plate (3) and a detector (5) for sensing fluorescent light is arranged at the same side of the base plate (1) as the light source (7).

L'invention concerne un procédé et un dispositif pour mettre en oeuvre des tests immunologiques à fluorescence, notamment quantitatifs, par excitation de champs évanescents, éventuellement sur la base des différents essais biochimiques connus constitués en général de systèmes de récepteurs et de ligands. Toutefois, on évalue de préférence des systèmes d'anticorps et d'antigènes. L'invention permet d'effectuer des tests immunologiques quantitatifs à fluorescence avec différents essais biochimiques connus au moyen d'un dispositif très simple. On utilise à cet effet au moins une source de lumière (7, 8') qui émet des rayons d'une lumière pratiquement monochromatique d'une longueur d'onde qui provoque la fluorescence d'un indicateur lié à l'anticorps. Les rayons de lumière sont dirigés avec un angle alpha déterminé par une profondeur de pénétration prédéterminée pour le champ évanescent sur une surface limite (20) entre une plaque de base (1) optiquement transparente en un matériau dont l'indice de réfraction n1 est supérieur à l'indice de réfraction n2 du matériau au-dessus de la surface limite (20) et une zone en forme de cuvette (2) pour recevoir l'échantillon. La zone (2) est recouverte de son côté opposé à la plaque de base (1) par une plaque de couverture (3) et un détecteur (5) de lumière fluorescente est monté du même côté de la plaque de base (1) que la source de lumière (7).

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