Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Nitromethane as solvent in capillary electrophoresis.

Xavier Subirats1, Simo P Porras, Martí Rosés

  • 1Institute for Analytical Chemistry, University of Vienna, Vienna, Austria.

Journal of Chromatography. A
|July 26, 2005
PubMed
Summary

Nitromethane is a viable solvent for capillary electrophoresis, particularly for lipophilic analytes. This study details how ionic strength and pH affect analyte mobility and pKa values in nitromethane, confirming theoretical predictions.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Metabolic changes in human plasma samples among workers exposed to diisocyanate products.

Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association·2026
Same author

Characterization of a liposome electrokinetic capillary chromatography system for surrogation of cell membrane partitions.

Analytical and bioanalytical chemistry·2026
Same author

An introduction to BASIC Guide: human biomonitoring and surveillance of chemical exposure in occupational settings.

Annals of work exposures and health·2025
Same author

Characterization of HPLC columns: a comparison of Tanaka and Abraham methods.

Journal of chromatography. A·2025
Same author

Towards biomimetic electrochromatography: Fast method for the Abraham's characterization of solute-solvent interactions in micellar and microemulsion electrokinetic systems.

Journal of chromatography. A·2025
Same author

HBM4EU e-waste study - Occupational exposure assessment to chromium, cadmium, mercury and lead during e-waste recycling.

Environmental research·2025

Area of Science:

  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Nitromethane offers advantageous properties for capillary electrophoresis (CE), including suitable temperature range, low viscosity, and intermediate dielectric constant.
  • These properties make it a promising solvent for lipophilic analytes poorly soluble in aqueous solutions.

Purpose of the Study:

  • To investigate the influence of background electrolyte conditions (ionic strength and pH) on analyte properties in nitromethane-based CE.
  • To evaluate the electrophoretic behavior of analytes in nitromethane and compare it with theoretical models.

Main Methods:

  • Capillary electrophoresis experiments were conducted using nitromethane as the solvent.
  • Analyte mobilities and pKa values were measured under varying ionic strengths and pH conditions.
  • A pH scale was established using buffer solutions with known pKa values.

Related Experiment Videos

Main Results:

  • Analyte mobility decreased with increasing ionic strength, consistent with theoretical predictions (e.g., up to 30% decrease from 0 to 50 mmol/L).
  • The mobility of anionic analytes exhibited a sigmoidal dependence on pH, aligning with theoretical expectations.
  • pKa values of neutral acids in nitromethane were found to be shifted by up to 14 pK units compared to their values in water.

Conclusions:

  • The experimental findings validate the theoretical models for electrolyte solutions in the context of capillary electrophoresis in nitromethane.
  • Nitromethane facilitates the separation of neutral analytes through the formation of charged complexes via heteroconjugation with chloride ions.