A method is disclosed for effecting the concentration of a polar analyte in an alternating electric field. In the method, a relative translation of the polar analyte and an alternating electric field along a translation path is effected. A portion of the polar analyte is then trapped and concentrated...http://www.google.de/patents/US6537433?utm_source=gb-gplus-sharePatent US6537433 - Methods and apparatus for the location and concentration of polar analytes using an alternating electric field
