DNA Translocation Through Short Nanofluidic Channels Under Asymmetric Pulsed Electric Field

Overview

Journal Biomicrofluidics

Publisher American Institute of Physics

Specialty Biomedical Engineering

Date 2014 May 8

PMID 24803963

Citations 5

Authors

C Gupta

W-C Liao

D Gallego-Perez

C E Castro

L J Lee

Affiliations

Soon will be listed here.

Abstract

Investigation of single molecule DNA dynamics in confined environments has led to important applications in DNA analysis, separation, and sequencing. Here, we studied the electrophoretic transport of DNA molecules through nanochannels shorter than the DNA contour length and calculated the associated translocation time curves. We found that the longer T4 DNA molecules required a longer time to traverse a fixed length nanochannel than shorter λ DNA molecules and that the translocation time decreased with increasing electric field which agreed with theoretical predictions. We applied this knowledge to design an asymmetric electric pulse and demonstrate the different responses of λ and T4 DNA to the pulses. We used Brownian dynamics simulations to corroborate our experimental results on DNA translocation behaviour. This work contributes to the fundamental understanding of polymer transport through nanochannels and may help in designing better separation techniques in the future.

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