Quantitative detection of analytes on immunochromatographic...

G - Physics – 01 – N

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G01N 33/558 (2006.01) G01N 21/25 (2006.01) G01N 33/537 (2006.01) G01N 33/543 (2006.01)

Patent

CA 2198948

Disclosed is an improved method for determining the concentration of analyte in a test fluid by immunochromatography techniques which involves quantitatively determining the signals from captured labeled specific binding partner for the analyte by instrumental means, e.g. reflectance spectrometry. In a preferred embodiment, a reflectance reading is determined for both the captured and uncaptured labeled binding partner, which is captured in a separate zone of the immunochromatographic strip, and the ratio of these reflectances is used to provide additional quantitation to the assay method. The ratioing technique can be used with either a sandwich type immunoassay format or the format in which the free labeled binding partner is captured by immobilized analyte.

L'invention est une méthode améliorée pour déterminer la concentration des composantes d'un mélange à analyser contenu dans un fluide par des techniques d'immunochromatographie dans lesquelles on détermine quantitativement par des moyens instrumentaux, par exemple au moyen d'un spectromètre à réflectance, les caractéristiques des signaux provenant du partenaire capté. Dans la concrétisation privilégiée de l'invention, les réflectances des partenaires captés et non captés sont mesurées dans des zones distinctes de la bande immunochromatographique, et le rapport de ces réflectances sert d'information quantitative additionnelle dans la méthode de dosage. Ce rapport peut être utilisé avec un dosage immunologique en sandwich, ou dans le format dans lequel le partenaire libre est capté par le mélange immobilisé.

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