Electrophoretron: A new method for enhancing resolution in electrokinetic separations

Joong Gill Choi, Miyeon Kim, Rajeev Dadoo, Richard N. Zare

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Two capillaries, each of which have different surface preparations on their inside walls, are joined together to form a closed loop, and electrodes are placed inside the two capillaries. When the loop is filled with liquid and a potential difference is applied between the two electrodes, a circulating flow of liquid is established inside the loop because the resistance to flow is unequal in going from one electrode to another in a clockwise versus a counterclockwise direction. Consequently, a sample injected into this device, which we call an electrophoretron, repeatedly circulates between the two electrodes and the capillary separation column becomes effectively one of unlimited length. On each cycle the separation between analytes with different mobilities increases, thus enhancing resolution of analytes having nearly the same mobilities. The operation of a prototype electrophoretron is demonstrated.

Original languageEnglish
Pages (from-to)53-58
Number of pages6
JournalJournal of Chromatography A
Issue number1-2
Publication statusPublished - 2001 Jul 27

Bibliographical note

Funding Information:
We acknowledge Beckman Coulter, Inc. for their support. J.-G.C. especially thanks the LG Yon-Am Foundation for financial support to make possible his sabbatical leave at Stanford.

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry


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