Device for highly sensitive magnetic detection of analytes

G - Physics – 01 – N

Patent

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Details

G01N 27/74 (2006.01) A61B 5/05 (2006.01) G01N 27/72 (2006.01) G01N 33/487 (2006.01) G01N 33/53 (2006.01) G01R 33/12 (2006.01)

Patent

CA 2250087

An apparatus for the qualitative and/or quantitative measurement of analytes, in particular in biological samples by means of receptor ligand binding and having a magnetizing device for the production of a magnetic field at the location of the sample and with a detection device for measurement of magnetic properties of the sample is characterized in that the magnetizing device (11'; 11'') is spatially disposed with respect to the detection device (71, 8, 9, 10; 16; 20) in such a fashion that the magnetic field produced by the magnetization device (11', 11'') at the location of the magnetization is attenuated by at least a factor of 10, and preferentially by a factor of 1000 or more, at the location occupied by the sample during the measurement, or in that a switching device is provided for which, throughout a predetermined time duration and in particular during the measurement phase of the detection device (71, 8, 9, 10; 16), can switch-off the magnetic field of the magnetizing device (11; 21) at the location of the sample (12). In this fashion new types of measurements for magnetorelaxometric detection of analytes or for the detection of analytes by means of remanence measurements can be carried out in a routine and economical fashion in vitro or in vivo. (Fig. 1)

L'invention concerne une installation servant à la détection qualitative et/ou quantitative d'analytes contenus dans un échantillon de mesure en particulier également biologique, au moyen de liaisons récepteur-ligand. Ladite installation comprend un dispositif de magnétisation servant à produire un champ magnétique à l'emplacement ou se trouve l'échantillon de mesure, ainsi qu'un dispositif de détection servant à mesurer des propriétés magnétiques de l'échantillon de mesure, et elles se caractérisent en ce que le dispositif de magnétisation (11', 11'') est disposé, dans l'espace, par rapport au dispositif de détection (71, 8, 9, 10; 16; 20), de sorte que le champ magnétique de ce dispositif de magnétisation (11'; 11'') produit à l'emplacement de la magnétisation est affaibli, à l'endroit occupé par l'échantillon de mesure pendant la mesure, d'au moins un facteur de 10, de préférence d'un facteur de 1000 ou supérieur, ou bien en ce qu'un dispositif de commutation est prévu, lequel, pendant une période donnée, en particulier, pendant la phase de mesure du dispositif de détection (71, 8, 9, 10; 16), peut interrompre le champ magnétique du dispositif de magnétisation (11; 21) à l'emplacement de l'échantillon de mesure (12). Il est ainsi possible de mettre en oeuvre, de façon reproductible et bon marché, in vitro ou in vivo, des procédés d'un nouveau type de détection magnétos-relaxométrique d'analytes ou de détection d'analytes par mesure de la rémanence.

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