Separation of charged particles by a spatially and...

G - Physics – 01 – N

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G01N 27/26 (2006.01) G01N 27/447 (2006.01)

Patent

CA 2354589

This invention relates to a method and device for separating particles according to their diffusivities in a separation medium by means of a spatially and temporally varying electric potential. The method takes advantage of the transport of charged particles subject to an electric potential that is cycled between an off-state (in which the potential is flat) and one or more on-states, in which the potential is preferably spatially periodic with a plurality of eccentrically shaped stationary wells. The potential wells are at a constant spatial positions in the on-state. Differences in liquid-phase diffusivities lead to charged particle separation. A separation medium fills physically defined separation lanes (15) in the device. Electrodes deposited substantially transverse to the lanes create the required potential. Advantageously, injection ports (16) allow sample loading, and special gating electrodes focus the sample prior to separation.

L'invention porte sur un procédé et un dispositif de séparation de particules en fonction de leur capacité de diffusion dans un milieu séparateur en faisant varier un potentiel électrique dans l'espace et dans le temps. Le procédé repose sur le transport de particules chargées soumis à un potentiel électrique cyclé entre un état zéro (de potentiel plat) et un ou plusieurs états, ledit potentiel variant de préférence selon une périodicité spatiale en passant par différents puits de potentiel stationnaires disposés excentriquement, lesdits puits se trouvant à des positions spatiales constantes pour un état donné. Les différences de capacité de diffusion en phase liquide entraînent la séparation des particules chargées. Un milieu séparateur remplit des couloirs (15) de séparation physiques formés dans le dispositif. Des électrodes déposées sensiblement perpendiculairement aux couloirs créent le potentiel requis. On aura avantage à utiliser des ports (16) d'injection permettant le chargement de l'échantillon, et des électrodes spéciales de déclenchement focalisant l'échantillon avant la séparation.

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