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Related Concept Videos

Gas Chromatography: Introduction01:13

Gas Chromatography: Introduction

Gas chromatography (GC) is a technique for separating and analyzing volatile compounds in a sample. Its primary purpose is to identify and quantify components in complex mixtures, making it essential in fields such as environmental analysis, pharmaceuticals, and petrochemicals. GC is also called vapor-phase chromatography (VPC) or gas-liquid partition chromatography (GLPC).
In GC,  a sample is vaporized and mixed with an inert carrier gas (the mobile phase), which transports it through a column.
Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall. The coating...
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...
Gas Chromatography: Sample Injection Systems01:08

Gas Chromatography: Sample Injection Systems

In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
Two primary injection methods are used...
Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
Types Of Column Chromatography01:29

Types Of Column Chromatography

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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Updated: May 27, 2026

Automated Hydrophobic Interaction Chromatography Column Selection for Use in Protein Purification
10:21

Automated Hydrophobic Interaction Chromatography Column Selection for Use in Protein Purification

Published on: September 21, 2011

A simple parallel gas chromatography column screening system.

Wes Schafer1, Simon E Hamilton, Zainab Pirzada

  • 1Analytical Chemistry, Merck Research Laboratories, Rahway, NJ 07065, USA.

Chirality
|November 29, 2011
PubMed
Summary
This summary is machine-generated.

Automated screening of four chiral gas chromatography (GC) columns in two runs accelerates method development. This system simplifies analysis by eliminating manual column changes, speeding up the process.

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Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Chiral gas chromatography (GC) method development is often time-consuming.
  • Manual column switching is a bottleneck in optimizing GC methods.

Purpose of the Study:

  • To develop a simple, automated system for rapid chiral GC method development.
  • To enable simultaneous screening of multiple GC columns.

Main Methods:

  • A conventional GC instrument was configured with a second autosampler and Y-splitters.
  • This setup allowed for the automated evaluation of four different columns in two back-to-back runs.

Main Results:

  • The system enabled rapid screening of four chiral GC columns.
  • Analysis time was significantly reduced compared to manual methods.
  • A rapid isothermal GC method was successfully developed from screening results.

Conclusions:

  • The automated system provides a simple and effective approach to chiral GC method development.
  • This method accelerates analysis and reduces the need for manual column manipulation.