DNA nanopore translocation in glutamate solutions

Nanoscale. 2015 Aug 28;7(32):13605-9. doi: 10.1039/c5nr02793d. Epub 2015 Jul 24.

Abstract

Nanopore experiments have traditionally been carried out with chloride-based solutions. Here we introduce silver/silver-glutamate-based electrochemistry as an alternative, and study the viscosity, conductivity, and nanopore translocation characteristics of potassium-, sodium-, and lithium-glutamate solutions. We show that it has a linear response at typical voltages and can be used to detect DNA translocations through a nanopore. The glutamate anion also acts as a redox-capable thickening agent, with high-viscosity solutions capable of slowing down the DNA translocation process by up to 11 times, with a corresponding 7 time reduction in signal. These results demonstrate that glutamate can replace chloride as the primary anion in nanopore resistive pulse sensing.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • DNA / chemistry*
  • DNA / metabolism*
  • Electric Conductivity
  • Electrochemical Techniques
  • Electrodes
  • Equipment Design
  • Glutamic Acid / chemistry*
  • Glutamic Acid / metabolism*
  • Nanopores*
  • Nanotechnology
  • Potassium Chloride / chemistry
  • Viscosity

Substances

  • Glutamic Acid
  • Potassium Chloride
  • DNA