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Related Concept Videos

Chromatographic Methods: Terminology01:18

Chromatographic Methods: Terminology

Chromatography is an analytical technique widely used in fields such as chemistry, biology, environmental science, and pharmaceuticals to separate the components of a mixture and identify substances between them. The process of chromatography is based on the interactions between two distinct phases: the stationary phase and the mobile phase. The stationary phase is fixed in place by a supporting material, while the mobile phase moves over it, carrying the solutes. As the mobile phase travels,...
Chromatographic Methods: Classification01:12

Chromatographic Methods: Classification

Chromatographic techniques are classified in three ways: the classification is based on the physical state of the stationary and mobile phases, how the mobile phase and the stationary phase contact each other, or through the chemical or physical processes that isolate the components of the sample. Typically, the mobile phase is either a liquid or gas, while the stationary phase is either a solid or a liquid layer applied to a solid surface.
Chromatographic techniques are typically named by...
Column Efficiency: Rate Theory01:12

Column Efficiency: Rate Theory

The rate theory of chromatography provides quantitative insight into the shapes and widths of elution bands. These bands are based on the random-walk mechanism governing molecular migration within a column. The Gaussian profile of chromatographic bands arises from the cumulative effect of random molecular motions as they progress through the column.
During elution, a solute molecule experiences numerous transitions between stationary and mobile phases, exhibiting irregular residence times in...
High-Performance Liquid Chromatography: Elution Process01:05

High-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...
Chromatography: Introduction01:10

Chromatography: Introduction

Chromatography is a technique used to separate compounds based on differences of partitioning between two phases, the stationary phase and the mobile phase.
The phase in which the compounds linger or on which the compounds adsorb is called the stationary phase, whereas the mobile phase is the solvent that carries the solutes to be analyzed. In traditional column chromatography, the mixture flows through the stationary phase, and the compounds partition between the stationary and mobile phases...
Optimizing Chromatographic Separations01:15

Optimizing 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...

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Detection of Regulated Ergot Alkaloids in Food Matrices by Liquid Chromatography-Trapped Ion Mobility Spectrometry-Time-of-Flight Mass Spectrometry
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Statistical method for quantifying mobile phase selectivity in one- and two-dimensional overpressured layer

D Nurok1, R M Kleyle, C L McCain

  • 1Departments of Chemistry and Mathematical Sciences, School of Science, Indiana University [Formula: see text] Purdue University at Indianapolis, 402 Blackford Street, Indianapolis, Indiana 46202.

Analytical Chemistry
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a method for selecting mobile phases in chromatography, identifying optimal systems for steroid separation. Butyl acetate/toluene and aqueous trifluoroethanol mixtures are highlighted as effective mobile phases for one- and two-dimensional chromatography.

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Area of Science:

  • Analytical Chemistry
  • Chromatographic Techniques

Background:

  • Selecting optimal mobile phases is crucial for effective chromatographic separations.
  • Overpressured layer chromatography (OPLC) is a form of forced-flow thin-layer chromatography.
  • Steroid separation presents a complex analytical challenge.

Purpose of the Study:

  • To develop and apply a method for selecting mobile phases for one-dimensional (1-D) and two-dimensional (2-D) planar chromatography.
  • To evaluate separation quality for steroid mixtures using simulated chromatograms.
  • To identify optimal mobile phase systems for steroid separation via OPLC.

Main Methods:

  • Simulated chromatograms were generated for 100+ subsets of 30 steroids.
  • 15 1-D and 105 2-D chromatographic systems were evaluated.
  • Two metrics were used to assess separation quality across varying subset sizes (5-25 steroids).

Main Results:

  • Butyl acetate/toluene on silica gel and aqueous 2,2,2-trifluoroethanol were ranked as the best 1-D systems on average.
  • These two systems formed the highest-ranked 2-D system.
  • The probability of a system being optimal decreased with smaller subset sizes.

Conclusions:

  • The study provides a quantitative method for mobile phase selection in planar chromatography.
  • Optimal mobile phases were identified for steroid separation, with system performance dependent on sample complexity.
  • The method allows for estimation of spot capacity and quantification of mobile phase selectivity.