Hewlett-packard Company

Mark R Bateman

James E Young

Jurgen Alfred Lux

John A Christianson

A method of making a capillary tube for providing increased control of electroosmotic flow in electrophoretic separation. A resistive coating solution is formed so that a tube coating having a high electrical resistivity may be achieved. An electrically conductive material, such as carbon black, is homogeneously mixed with a polymer, such as polyimide, in a solvent. The content by weight of the electrically conductive material is less than 20 percent and is preferably within 7 percent to 8 percent, relative to the content by weight of the polymer. The resistive coating solution is applied to the exterior of the tube until a thickness is reached which achieves a desired resistance across the coated exterior surface. Typically, a multi-layered coating is formed. The coating solution may be applied while rotating the capillary tube or, alternatively, while the capillary tube is drawn past an applicator.

Method of making an electrophoretic capillary tube

An apparatus and method for selecting a vial from a plurality of vials and for transporting the selected vial to a sampling device such as a capillary zone electrophoresis apparatus. The apparatus comprises a removable turret assembly for holding a plurality of vials, a drive for rotating the turret assembly and for aligning a selected vial with the sampling device, and a transport device for transporting the selected vial to the sampling device. The appratus may further comprise a device to supply a cooled gas to the turret assembly, and a control device for controlling the drive and the transport device.

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Mountain View, CA, United States of America

Mark R Bateman