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Related Concept Videos

Gas Chromatography: Types of Columns and Stationary Phases01:17

Gas Chromatography: Types of Columns and Stationary Phases

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

High-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:
Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...
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...
Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

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 solvents...
Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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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C18, C8, and perfluoro reversed phases on diamond for solid-phase extraction.

Gaurav Saini1, Landon A Wiest, David Herbert

  • 1Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA.

Journal of Chromatography. A
|January 3, 2009
PubMed
Summary

New diamond-based reversed solid-phase extraction (SPE) phases overcome limitations of silica. These novel materials offer wider pH stability and reusability, advancing SPE technology for analytical chemistry applications.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Chromatography

Background:

  • Traditional silica-based solid-phase extraction (SPE) columns have limitations.
  • These include a restricted pH range for operation.
  • Silica-based columns are often single-use, increasing waste and cost.

Purpose of the Study:

  • To develop novel diamond-based reversed SPE phases.
  • To evaluate their performance against conventional silica phases.
  • To present the synthesis and properties of these new materials.

Main Methods:

  • Synthesis of diamond-based reversed SPE phases (C18, C8, perfluorinated).
  • Characterization of phase properties.
  • Stability, percent recovery, and column capacity testing of the C18 phase.

Main Results:

  • Diamond-based SPE phases demonstrate improved performance over silica.
  • These new phases exhibit a wider operational pH range.
  • The C18 diamond phase shows good stability, high percent recovery, and significant column capacity.

Conclusions:

  • Diamond-based stationary phases represent a significant advancement in SPE technology.
  • They overcome key limitations of current silica-based materials.
  • These novel phases offer enhanced stability, broader applicability, and potential for cost-effective, reusable SPE methods.