Related Experiment Video
Updated: Jun 14, 2026
06:44
Curtain Flow Column: Optimization of Efficiency and Sensitivity
Published on: June 12, 2016
Achieving the full performance of highly efficient columns by optimizing conventional benchmark high-performance
Fabrice Gritti1, Carl A Sanchez, Tivadar Farkas
1Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600, USA.
Journal of Chromatography. A
|March 27, 2010
Summary
Minimizing extra-column band broadening in liquid chromatography instruments is crucial. Simple modifications to conventional systems can unlock the full potential of Kinetex-C(18) columns, significantly improving resolution.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Extra-column band broadening significantly impacts chromatographic resolution.
- Conventional liquid chromatographs often have limitations due to instrument design.
Purpose of the Study:
- To demonstrate the importance of minimizing extra-column band broadening.
- To achieve the full potential efficiency of Kinetex-C(18) columns using a conventional liquid chromatograph.
Main Methods:
- Modified instrument components (needle seat, capillary connectors, detector cell) to reduce extra-column volume.
- Injected a volume of weak eluent post-sample injection.
- Utilized three Kinetex-C(18) columns (2.1 mm x 50 mm, 4.6 mm x 50 mm, 4.6 mm x 100 mm).
Main Results:
- Significant increases in resolution for Kinetex-C(18) columns (180%, 35%, 30% for different dimensions).
- Achieved resolution comparable to advanced HPLC systems (Agilent 1200, 1290 Infinity, Acquity).
- Demonstrated that instrument modifications can overcome inherent limitations.
Conclusions:
- Minimizing extra-column band broadening is essential for maximizing column performance.
- Conventional liquid chromatographs can achieve high resolution with strategic instrument modifications.
- These findings offer practical strategies for enhancing chromatographic analysis.
Related Concept Videos
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.
01:11High-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:
01:15Optimizing 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...
01:13Principles Of Column Chromatography
The chromatography technique was first invented in 1901 by Michael S. Tswett, a Russian botanist, to separate plant pigments using organic solvents. Further, in 1941, Archer John Porter Martin and R. L. M. Synge modified the technique by packing silica gel into a column. A mixture of amino acids was then separated on the packed column using chloroform and water mixture as the mobile phase. This was the first report on column chromatography. At present, column chromatography is a widely used...
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...
01:10Column Efficiency: Plate Theory
Band broadening in a chromatography column is measured by its efficiency. This is determined by the number of theoretical plates (N). Theoretical plate theory states that a separation column consists of a continuous series of imaginary plates where solute equilibration occurs between stationary and mobile phases.
A higher number of theoretical plates signifies better column efficiency and improved separation capabilities. Plate height affects bandwidth and separation quality; it is inversely...
A higher number of theoretical plates signifies better column efficiency and improved separation capabilities. Plate height affects bandwidth and separation quality; it is inversely...