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Related Concept Videos

Silica Gel Column Chromatography: Overview01:10

Silica Gel Column Chromatography: Overview

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Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
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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.
In HPLC, two phases play a critical role in the separation process:
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Gas Chromatography: Types of Columns and Stationary Phases01:17

Gas Chromatography: Types of Columns and Stationary Phases

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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.
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
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Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

2.7K
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
2.7K
Types Of Column Chromatography01:29

Types Of Column Chromatography

14.9K
The stability and compatibility of column material with samples are crucial for efficient purification in chromatographic techniques. Various operating parameters such as pH, temperature, or solvent affect the packing of the column material, thereby determining the purification efficiency. The choice of column material also plays an essential role in deciding the operating parameters and can be modified based on the proteins that need to be purified.
Gel Filtration Chromatography
When the...
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Simple In-House Ultra-High Performance Capillary Column Manufacturing with the FlashPack Approach
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Recent Progress in Monolithic Silica Columns for High-Speed and High-Selectivity Separations.

Tohru Ikegami1, Nobuo Tanaka2

  • 1Faculty of Molecular Chemistry and Engineering, Kyoto Institute of Technology, Kyoto 606-8585, Japan;

Annual Review of Analytical Chemistry (Palo Alto, Calif.)
|June 17, 2016
PubMed
Summary

Monolithic silica columns offer high efficiency due to their pore structure. This review details advancements in their size, functionalization, and practical applications for chromatography.

Keywords:
column diameter and lengthcolumn efficiencymonolithic structurepermeabilitypolymer coatingsurface modification

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Area of Science:

  • Chromatography
  • Materials Science
  • Analytical Chemistry

Background:

  • Particulate columns have limitations in efficiency and support structure.
  • Monolithic silica columns offer superior through-pore size to skeleton size ratios.
  • These properties enable the development of high-efficiency columns and selective stationary phases.

Purpose of the Study:

  • To review the expansion of monolithic silica column size ranges.
  • To explore methods for achieving high efficiency in these columns.
  • To discuss silica surface functionalization for selective stationary phases.

Main Methods:

  • Review of literature on monolithic silica column preparation and functionalization.
  • Analysis of advancements in structural feature size reduction (sub-micron).
  • Evaluation of in situ chemical modification techniques and reaction condition optimization.

Main Results:

  • Monolithic silica columns demonstrate enhanced efficiency compared to particulate columns.
  • Expanded size ranges and sub-micron features improve versatility.
  • Various functionalization methods yield selective stationary phases on monolithic silica supports.

Conclusions:

  • Monolithic silica columns represent a significant advancement in chromatographic technology.
  • Ongoing research focuses on improving versatility through miniaturization and optimized modification.
  • These columns are crucial for developing advanced selective stationary phases.