Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...
Patent
1996-03-27
1999-08-17
Beisner, William H.
Chemistry: electrical and wave energy
Processes and products
Electrophoresis or electro-osmosis processes and electrolyte...
204600, G01N 2726, G01N 27447
Patent
active
059389044
ABSTRACT:
This invention relates to a method and device for separating charged particles according to their diffusivities in a separation medium by means of a spatially and temporarily varying electric potential. The method is particularly suited to sizing and separating DNA fragments, to generating DNA fragment length polymorphism patterns, and to sequencing DNA through the separation of DNA sequencing reaction products. 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 potential wells. The potential wells are at constant spatial positions in the on-state. Differences in liquid-phase diffusivities lead to charged particle separation. A preferred embodiment of the device is microfabricated. A separation medium fills physically defined separation lanes in the device. Electrodes deposited substantially transverse to the lanes create the required electric potentials. Advantageously, injection ports allow sample loading, and special gating electrodes focus the sample prior to separation. The effects of thermal gradients are minimized by placing the device in contact with a thermal control module, preferably a plurality of Peltier-effect heat transfer devices. The small size of a microfabricated device permits rapid separation in a plurality of separation lanes.
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Bader Joel S.
Deem Michael W.
Mulhern Gregory T.
Rothberg Jonathan M.
Went Gregory T.
Beisner William H.
CuraGen Corporation
Starsiak Jr. John S.
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