K(+) , Na(+) , and Mg(2+) on DNA translocation in silicon nitride nanopores.

ABSTRACT: In this work, we report on how salt concentration and cation species affect DNA translocation in voltage-biased silicon nitride nanopores. The translocation of dsDNA in linear, circular, and supercoiled forms was measured in salt solutions containing KCl, NaCl, and MgCl(2) . As the KCl concentrations were decreased from 1 to 0.1 M, the time taken by a DNA molecule to pass through a nanopore was shorter and the frequency of the translocation in a folded configuration was reduced, suggesting an increase in DNA electrophoretic mobility and DNA persistence length. When the salt concentration was kept at 1 M, but replacing K(+) with Na(+) , longer DNA translocation times (t(d) ) were observed. The addition of low concentrations of MgCl(2) with 1.6 M KCl resulted in longer t(d) and an increas

SUBMITTER: Uplinger J 

PROVIDER: S-EPMC3514626 | biostudies-literature | 2012 Dec

REPOSITORIES: biostudies-literature