Method and apparatus for injecting liquid into a capillary tube

Details Method and apparatus for injecting liquid into a capillary tube Method and apparatus for injecting liquid into a capillary tube

1993-12-27

1994-10-25

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204299R, B01D 5702

Patent

active

053586131

ABSTRACT:
In a method and a corresponding apparatus for injecting liquid from a vial into a capillary tube, in particular in capillary electrophoresis, a source of overpressure and a source of underpressure are connectable to the vial for applying overpressure or underpressure in the space above the liquid. During an injection, the pressure is continuously varied in a controlled way by corresponding control of the pressure sources, for example by controlling associated valves. The pressure is first gradually increased and then gradually decreased. The actual pressure variation during an injection is measured by a pressure sensor and used by a controller to control the durations of the time intervals during which overpressure or underpressure are applied such that a desired amount of liquid is introduced into the capillary.

REFERENCES:
"Characterization and Automation of Sample Introduction Methods For Capillary Zone Electrophoresis", D. J. Rose, et al., vol. 60, No. 7, Apr. 1988, pp. 642-648.
European Search Report, 3 pages, Jul. 2, 1993.

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