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

Sample-stacking techniques in non-aqueous capillary electrophoresis.

Chih-Hsin Tsai1, Chung-Chen Tsai, Ju-Tsung Liu

  • 1Department of Chemistry, National Taiwan Normal University, 88 Sec. 4, Tingchow Road, Taipei, Taiwan.

Journal of Chromatography. A
|April 23, 2005
PubMed
Summary
This summary is machine-generated.

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

Analysis of Fermented Red-Yeast Rice Products Using Femtosecond Laser Ionization Mass Spectrometry.

Journal of the American Society for Mass Spectrometry·2025
Same author

Capillary action-driven surface-enhanced Raman spectroscopy (SERS) for the identification of phthalocyanine blue in modern paintings based on the BPG spot test.

Analytical methods : advancing methods and applications·2024
Same author

Quantification of peracetic acid (PAA) in the H<sub>2</sub>O<sub>2</sub> + acetic acid reaction by the wavelength shift analysis in near-UV/visible absorption region.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry·2024
Same author

The use of RGB-tracking of color changes during indigo-reduction processes based on LabVIEW machine vision.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry·2023
Same author

Investigation of optimal conditions needed for the production of indigo and subsequent dyeing using CO<sub>2</sub>/O<sub>2</sub> sensors and a cellphone camera.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry·2022
Same author

Comparison and characterization of pigments and dyes by Raman spectroscopy.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry·2022
Same journal

Insights into cellulose/pectin effect in tobermorite/mandarin orange peel composite hydrogels and rehabilitation effect on Cd- and Pb-contaminated slopes.

Journal of chromatography. A·2026
Same journal

Retention prediction in reversed-phase liquid chromatography using XGBoost-based quantitative structure-retention relationships models.

Journal of chromatography. A·2026
Same journal

Impurity profiling of lipid-conjugated oligonucleotides using reversed-phase with and without ion-pair reagents and hydrophilic interaction liquid chromatography.

Journal of chromatography. A·2026
Same journal

Preparation of magnetic zwitterionic covalent organic frameworks for rapid simultaneous extraction of hydrophilic and hydrophobic organophosphates from environmental waters coupled with UHPLC-MS/MS determination.

Journal of chromatography. A·2026
Same journal

Analysis of organic and inorganic acids in biomass pyrolysis process samples by ion chromatography-mass spectrometry.

Journal of chromatography. A·2026
Same journal

Separation and enrichment of phages at the interface between two phases in a green solvent-based sugaring-out extraction system.

Journal of chromatography. A·2026
See all related articles

Two novel methods enhance sample stacking in non-aqueous capillary electrophoresis (NACE) by creating conductivity gradients. These techniques significantly improve detection limits for compounds like 3,4-methylenedioxymethamphetamine.

Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Optimizing sample stacking in capillary electrophoresis is crucial for improving detection limits.
  • Simply increasing sample volume is insufficient; electrophoretic parameters require careful optimization.

Purpose of the Study:

  • To develop novel sample stacking methods for non-aqueous capillary electrophoresis (NACE) to increase injected sample volume and improve analyte focusing.
  • To enhance detection limits in NACE.

Main Methods:

  • Development of an "ultra-high conductivity zone" method using an unequal conductivity gradient.
  • Implementation of a "low temperature bath" method, creating a pseudo-high-conductivity zone by decreasing temperature.
  • Application of these methods to 3,4-methylenedioxymethamphetamine using NACE.

Related Experiment Videos

Main Results:

  • The ultra-high conductivity zone and low-temperature zone methods enabled large-volume sample injection.
  • Detection limits for 3,4-methylenedioxymethamphetamine were improved from 1.6 x 10(-6) M to 3.0 x 10(-8) M (normal stacking), 4.8 x 10(-9) M (ultra-high conductivity zone NACE-stacking), and 5.0 x 10(-9) M (low-temperature zone NACE-stacking).

Conclusions:

  • Novel ultra-high conductivity zone and low-temperature zone stacking techniques effectively enhance sample injection and focusing in NACE.
  • These methods significantly improve detection limits, offering a valuable advancement for trace analysis in non-aqueous capillary electrophoresis.