Determination of electroosmotic and electrophoretic mobility of DNA and dyes in low ionic strength solutions

Joshua Lallman, Rachel Flaugh, Kristy L. Kounovsky-Shafer

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Nanocoding, a genome analysis platform, relies on very low ionic strength conditions to elongate DNA molecules up to 1.06 (fully stretched DNA = 1). Understanding how electroosmotic and electrophoretic forces vary, as ionic strength decreases, will enable better Nanocoding devices, or other genome analysis platforms, to be developed. Using gel electrophoresis to determine overall mobility (includes contributions from electrophoretic and electroosmotic forces) in different ionic strength conditions, linear DNA molecules (pUC19 (2.7 kb), pBR322 (4.4 kb), ΦX174 (5.4 kb), and PSNAPf-H2B (6.2 kb)) were analyzed in varying gel concentrations (1.50, 1.25, 1.00, 0.75, and 0.50%). Additionally, buffer concentration (Tris-EDTA, TE) was varied to determine free solution mobility at different ionic strength solutions. As ionic strength decreased from 13.8 to 7.3 mM, overall mobility increased. As TE buffer decreased (< 7.3 mM), overall mobility drastically decreased as ionic strength decreased. Rhodamine B dye was utilized to determine the electroosmotic mobility. As the ionic strength decreased, electroosmotic mobility increased. The experimental electrophoretic mobility was compared to theoretical considerations for electrophoretic mobility (Pitts and Debye-Hückel-Onsager). Electroosmotic forces decreased the overall mobility of DNA molecules and bromophenol blue migration in a gel matrix as ionic strength decreased.

Original languageEnglish (US)
Pages (from-to)862-868
Number of pages7
JournalELECTROPHORESIS
Volume39
Issue number5-6
DOIs
StatePublished - Mar 2018

Fingerprint

Electrophoretic mobility
Ionic strength
Osmolar Concentration
Coloring Agents
DNA
Tromethamine
rhodamine B
Gels
Edetic Acid
Molecules
Bromphenol Blue
Genes
Genome
Electrophoresis
Buffers
Equipment and Supplies

Keywords

  • Electroosmosis
  • Electrophoresis
  • Linear dsDNA
  • Low ionic strength solutions

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry

Cite this

Determination of electroosmotic and electrophoretic mobility of DNA and dyes in low ionic strength solutions. / Lallman, Joshua; Flaugh, Rachel; Kounovsky-Shafer, Kristy L.

In: ELECTROPHORESIS, Vol. 39, No. 5-6, 03.2018, p. 862-868.

Research output: Contribution to journalArticle

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