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Related Concept Videos

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...
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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: 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...
Silica Gel Column Chromatography: Overview01:10

Silica Gel Column Chromatography: Overview

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...
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...

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Updated: May 24, 2026

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
09:38

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Published on: January 7, 2019

Sample stacking with in-column silylation for less volatile polar compounds using GC-MS.

Seungil Cho1

  • 1U.S. Food and Drug Administration, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, Silver Spring, MD 20993, USA. seungil.cho@fda.hhs.gov

Journal of Separation Science
|February 15, 2012
PubMed
Summary

This study introduces sample stacking with in-column silylation (SIS) for enhanced gas chromatography-mass spectrometry analysis of polar compounds. The method improves sensitivity and reduces adsorption for accurate quantification.

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Metabolomic Analysis of Barley by Gas Chromatography/Mass Spectrometry
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Metabolomic Analysis of Barley by Gas Chromatography/Mass Spectrometry

Published on: November 8, 2024

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Last Updated: May 24, 2026

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures
09:38

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Published on: January 7, 2019

Metabolomic Analysis of Barley by Gas Chromatography/Mass Spectrometry
08:15

Metabolomic Analysis of Barley by Gas Chromatography/Mass Spectrometry

Published on: November 8, 2024

Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Analysis of less volatile polar compounds presents challenges in gas chromatography-mass spectrometry due to adsorption and band broadening.
  • Traditional methods may lack sensitivity for trace-level detection of these compounds.

Purpose of the Study:

  • To develop and validate a novel analytical approach for the quantitative analysis of less volatile polar compounds.
  • To enhance the sensitivity and reduce adsorption issues in gas chromatography-mass spectrometry.

Main Methods:

  • Sample stacking with in-column silylation (SIS) technique was employed.
  • Utilized multiple injections (up to 100 times) of samples and N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) as the silylating reagent.
  • Investigated the quantitative characteristics using bisphenol A (BPA) as a model compound.

Main Results:

  • Sandwiched in-column silylation effectively reduced sample adsorption and band broadening by replacing polar hydrogen with trimethylsilyl groups.
  • Multiple injections significantly increased analytical sensitivity in a quantitative manner.
  • The SIS technique demonstrated capability for analyzing various polar compounds including hydroxyls, carboxylic acids, and amines.

Conclusions:

  • Sample stacking with in-column silylation (SIS) is an effective technique for the quantitative analysis of less volatile polar compounds.
  • The method offers improved sensitivity and reduced band broadening, making it suitable for complex sample matrices.
  • SIS provides a valuable tool for the GC-MS analysis of challenging polar analytes.