Ion-permeable polymer joint for use in capillary electrophoresis

Details Ion-permeable polymer joint for use in capillary electrophoresis Ion-permeable polymer joint for use in capillary electrophoresis

1992-03-02

1992-12-08

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Coating, forming or etching by sputtering

204301, 2041801, G01N 2726, B01D 5702

Patent

active

051695103

ABSTRACT:
Improved capillary electrophoresis (CE) apparatus (10) is provided which includes an intermediate grounding joint (34) serving to isolate delicate electrochemical detectors (32, 54, 58) from the high voltage CE power supply (20). The joint (34) includes a fracture (36) close to the detection end (22) of the apparatus (10) which is covered by a Nafion sleeve (38). The joint (34) is immersed in an ionic buffer reservoir (46) which includes a grounded cathode (48). In fabrication procedures, a capillary tube (12) is scored in proximity to one end (22) thereof, and the Nafion sleeve (38) is slid over the score line. The sleeve (38) is then sealed with epoxy (40, 42) at the ends thereof.

REFERENCES:
patent: 4908116 (1990-03-01), Zare et al.
patent: 5045172 (1991-09-01), Guzman
Thomas J. O'Shea et al "Capillary electrophoresis with electrochemical detection employing an on-line Nafion joint" Journal of Chromatography, 593 (1972) 305-312.

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