Electrophoretic injection within microdevices

Maribel Vazquez, Gareth McKinley, Luba Mitnik, Samantha Desmarais, Paul Matsudaira, Daniel Ehrlich

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


The flexibility of the microfabricated format creates unique opportunities for study of the electrophoretic process. The present work utilizes digital images to capture the motion of DNA samples during pre-electrophoretic processes. A systematic study of DNA loading and strong sample stacking (sample concentration effects) was performed in order to analyze realistic DNA analysis conditions within microdevices. Using digital imaging and microscopy, DNA sample profiles within the injector were analyzed by deconvolving the geometrical intensity profile into different velocity groups. This analysis illustrates the evolution of molecular separation into distinct migrating populations within the injector itself. The present study performed DNA injections within microfabricated devices imposing run voltages between 85 and 850 V/cm. Data from 3 different offset lengths of a double-T cross-injector, 10 different applied voltages, and 2 different sample preparation protocols are presented.

Original languageEnglish (US)
Pages (from-to)1952-1961
Number of pages10
JournalAnalytical Chemistry
Issue number9
StatePublished - May 1 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry


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