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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...
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: 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: 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...
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: 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...

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Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography
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Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography

Published on: September 2, 2020

Comprehensive three-dimensional gas chromatography with parallel factor analysis.

Nathanial E Watson1, W Christopher Siegler, Jamin C Hoggard

  • 1Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, USA.

Analytical Chemistry
|September 28, 2007
PubMed
Summary

A new three-dimensional gas chromatograph (GC3) instrument enables comprehensive and quantitative analysis. This advanced system, coupled with parallel factor analysis (PARAFAC), enhances data deconvolution and signal-to-noise ratios for complex mixtures.

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Area of Science:

  • Analytical Chemistry
  • Chromatography
  • Chemometrics

Background:

  • Comprehensive two-dimensional gas chromatography (GCxGC) has advanced separation science.
  • Analyzing complex samples requires sophisticated instrumentation and data processing techniques.
  • Existing methods may face limitations in resolving highly complex mixtures.

Purpose of the Study:

  • To develop and describe a novel three-dimensional gas chromatograph (GC3) instrument.
  • To evaluate the application of parallel factor analysis (PARAFAC) for analyzing GC3 data.
  • To assess the quantitative capabilities and peak capacity of the GC3 system.

Main Methods:

  • Development of a GC3 instrument using three in-series capillary columns and diaphragm valves.
  • Acquisition of comprehensive and quantitative data with optimized modulation periods.
  • Application of parallel factor analysis (PARAFAC) for trilinear data deconvolution.
  • Analysis of a 26-component test mixture and quantitative standards.

Main Results:

  • The GC3 instrument achieved a 3D peak capacity of 3500.
  • PARAFAC successfully deconvoluted overlapped analytes in the 3D data volume.
  • Quantitative analysis using PARAFAC showed a potential 10-fold improvement in signal-to-noise ratio.
  • Effective 3D peak capacity was considerably enhanced by PARAFAC deconvolution.

Conclusions:

  • The developed GC3 instrument provides a powerful platform for comprehensive and quantitative analysis.
  • PARAFAC is a suitable chemometric technique for deconvoluting complex trilinear GC3 data.
  • The GC3-PARAFAC combination offers significant advantages in peak capacity and quantitative accuracy.