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Related Concept Videos

Optimizing Chromatographic Separations01:15

Optimizing Chromatographic Separations

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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...
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High-Performance Liquid Chromatography: Introduction01:11

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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.
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Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves.
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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...
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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.
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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Selectivity optimization in liquid chromatography via stationary phase tuning.

Alexander Jaekel1, Mo Legelli1, Michaela Wirtz1

  • 1Department of Natural Sciences, University of Applied Sciences Bonn-Rhein-Sieg, Rheinbach, Germany.

Journal of Separation Science
|August 11, 2023
PubMed
Summary

Optimizing liquid chromatography separations involves adapting stationary phases for enhanced selectivity. This review highlights stationary phase tuning as a superior method for achieving superior separation of complex mixtures.

Keywords:
SOS-LChigh-performance liquid chromatographymixed-mode chromatographyselectivity tuningstationary phase

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Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Selectivity in liquid chromatography is crucial for effective separation.
  • Stationary phase properties are often underestimated as optimization parameters.

Purpose of the Study:

  • To review methods for adapting separation selectivity in liquid chromatography.
  • To emphasize the role of stationary phases in optimizing separations.

Main Methods:

  • Discussion of temperature and flow rate tuning.
  • Focus on stationary phase adaptation, including mixed-mode technologies.
  • Exploration of serial coupling, mixed-bed columns, and stationary phase optimized selectivity liquid chromatography (SPOS-LC).

Main Results:

  • Stationary phase tuning offers superior control over selectivity compared to mobile phase or temperature adjustments.
  • Highly selective stationary phases benefit separation of similar analytes.
  • Mixed-mode technologies and column coupling enhance separation of complex mixtures.

Conclusions:

  • Stationary phase optimization is a powerful and often underestimated tool in liquid chromatography.
  • Adapting stationary phases provides advantages for achieving optimal separation ranges and resolving complex mixtures.