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Isotachophoresis at pH extremes: theory and experimental validation
S V Ermakov1, M Y Zhukov, L Capelli
1University of Verona, Department of Agricultural and Industrial Biotechnologies, Italy.
Electrophoresis
|April 21, 1998
Summary
The study reveals that extreme pH conditions significantly alter isotachophoresis (ITP) system behavior due to ion contributions. A new analytical model accurately predicts these changes, improving ITP data analysis.
Area of Science:
- Analytical Chemistry
- Physical Chemistry
- Separation Science
Background:
- Existing isotachophoresis (ITP) theory often fails to predict system behavior at extreme pH.
- The influence of hydrogen or hydroxyl ions on conductivity and net charge is a key factor.
- Unexplained phenomena in ITP at pH extremes have been attributed to artifacts.
Purpose of the Study:
- To investigate and explain the altered dynamics of ITP systems in acidic and basic pH ranges.
- To develop a theoretical framework for understanding ITP behavior at pH extremes.
- To provide a tool for accurate analysis of ITP data and interpretation of unusual observations.
Main Methods:
- Theoretical analysis based on the revised Kohlrausch theory.
- Development of an analytical solution algorithm for ITP dynamics.
- Experimental validation and computer simulations.
Main Results:
- A new zone is formed in the terminating electrolyte at extreme pH, affecting ITP dynamics.
- One boundary of this zone moves, while the other remains stationary at the electrolyte discontinuity.
- The developed analytical model accurately predicts ITP system behavior, aligning with simulations and experiments.
Conclusions:
- The contribution of hydrogen/hydroxyl ions fundamentally changes ITP system behavior at pH extremes.
- The revised Kohlrausch theory and new analytical algorithm provide a robust explanation.
- This work aids in correct ITP data analysis and clarifies previously confusing phenomena.