Related Experiment Video
Updated: May 24, 2026
13:36
Simple In-House Ultra-High Performance Capillary Column Manufacturing with the FlashPack Approach
Published on: December 4, 2021
Temperature pulsing for controlling chromatographic resolution in capillary liquid chromatography
Tim J Causon1, Hernan J Cortes, Robert A Shellie
1Australian Centre for Research on Separation Science, School of Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania, Australia, 7001.
Analytical Chemistry
|March 2, 2012
Summary
Rapid temperature pulses enhance separation selectivity in capillary liquid chromatography (LC). This technique improves resolution for ion-exchange chromatography (IC) and hydrophilic interaction chromatography (HILIC) by precisely controlling column temperature.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Capillary liquid chromatography (LC) is a powerful separation technique.
- Improving chromatographic resolution and selectivity remains a key challenge.
Purpose of the Study:
- To introduce and demonstrate the effectiveness of rapid temperature pulses for selectivity tuning in capillary LC.
- To explore the application of this technique in ion-exchange chromatography (IC) and hydrophilic interaction chromatography (HILIC).
Main Methods:
- Implementation of a resistively heated column module for rapid and accurate temperature changes.
- Application of both positive and negative temperature pulses during chromatographic runs.
- Utilized packed capillary columns for IC and monolithic silica columns with zwitterionic functionality for HILIC.
Main Results:
- Short temperature pulses significantly improved resolution in specific chromatogram regions for both IC and HILIC.
- Demonstrated reproducible selectivity changes using temperature pulses.
- Showed that both increasing and decreasing temperature pulses effectively alter selectivity.
Conclusions:
- Rapid temperature pulses are a viable strategy for enhancing selectivity and resolution in capillary LC.
- This method offers a novel approach to optimize separations for challenging analytes.
- The technique is robust and applicable to various LC modes, including IC and HILIC.
Related Concept Videos
01:05High-Performance Liquid Chromatography: Elution Process
In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
00:57High-Performance Liquid Chromatography: Instrumentation
High-performance liquid chromatography, or HPLC, is an analytical technique that separates liquid samples under high pressures. An HPLC instrument consists of glass bottles for storing solvents called mobile phase reservoirs. HPLC-grade solvents are used to maintain high purity, and the dissolved gases are removed using a degasser, such as a vacuum pumping system or sparging with helium. The solvents are then pumped into the analytical column using a screw-driven syringe or reciprocating pumps.
01:15Chromatographic Resolution
In chromatography, a solute moves through a chromatographic column and tends to spread, forming a Gaussian-shaped band. The longer the solute spends in the column, the broader the band becomes. The broadening can lead to overlaps within the column, affecting separation effectiveness.
The effectiveness of separation can be evaluated by determining the level of separation between two neighboring peaks in a chromatogram, which represents the individual components of a sample.
In chromatography,...
The effectiveness of separation can be evaluated by determining the level of separation between two neighboring peaks in a chromatogram, which represents the individual components of a sample.
In chromatography,...
01:11High-Performance Liquid Chromatography: Introduction
High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
In HPLC, two phases play a critical role in the separation process:
In HPLC, two phases play a critical role in the separation process:
01:20Capillary Electrophoresis: Instrumentation
Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
01:15Optimizing Chromatographic Separations
Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...