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Proceedings Paper

Thermal gradient PCR in a continuous-flow microchip
Author(s): Niel Crews; Carl Wittwer; Bruce Gale
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Paper Abstract

A new continuous-flow PCR microchip has been developed that operates by cycling a prepared sample within a spatial temperature gradient. This design allows for minimal thermal residence times - a key feature of the protocols used by the fastest commercial PCR equipment. Since thermal gradients are a natural effect of heat dissipation, the appropriate temperature distribution for PCR can be generated by a minimum of one heater held at a steady state temperature. With a thermal gradient of more than 3°C/mm across the width of the chip, each complete PCR cycle requires approximately 2cm of channel length. These glass chips were manufactured using standard glass microfabrication methods as well as the Xurographic rapid prototyping technique. Targets of 110bp and 181bp were amplified from &Fgr;X174 plasmid DNA on these thermal gradient chips as well as on commercial PCR equipment, then subsequently analyzed by gel electrophoresis. Visual inspection of fluorescent images of the stained gels shows that the amplicon size and yield for the systems are comparable.

Paper Details

Date Published: 22 January 2007
PDF: 11 pages
Proc. SPIE 6465, Microfluidics, BioMEMS, and Medical Microsystems V, 646504 (22 January 2007); doi: 10.1117/12.702465
Show Author Affiliations
Niel Crews, Univ. of Utah (United States)
Carl Wittwer, Univ. of Utah (United States)
Bruce Gale, Univ. of Utah (United States)

Published in SPIE Proceedings Vol. 6465:
Microfluidics, BioMEMS, and Medical Microsystems V
Ian Papautsky; Wanjun Wang, Editor(s)

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