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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...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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).
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Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...

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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

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Comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry peak sorting algorithm.

Cheolhwan Oh1, Xiaodong Huang, Fred E Regnier

  • 1Bindley Bioscience Center, Purdue University, West Lafayette, IN 47907, USA.

Journal of Chromatography. A
|December 21, 2007
PubMed
Summary
This summary is machine-generated.

We developed a new peak sorting method for two-dimensional gas chromatography/time-of-flight mass spectrometry (GC x GC/TOF-MS) to accurately identify metabolites across multiple samples. This algorithm enhances data analysis by efficiently recognizing consistent metabolite peaks.

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Qualitative Characterization of the Aqueous Fraction from Hydrothermal Liquefaction of Algae Using 2D Gas Chromatography with Time-of-flight Mass Spectrometry

Published on: March 6, 2016

Area of Science:

  • Analytical Chemistry
  • Metabolomics
  • Mass Spectrometry

Background:

  • Accurate metabolite identification is crucial for comparative analyses in complex biological samples.
  • Thousands of peaks in GC x GC/TOF-MS data present challenges for reliable peak sorting and metabolite recognition.

Purpose of the Study:

  • To develop and validate a novel algorithm for automated peak sorting in GC x GC/TOF-MS data.
  • To improve the accuracy and efficiency of identifying the same metabolite across different samples.

Main Methods:

  • Utilized first- and second-dimension retention times and mass spectra from ChromaTOF software.
  • Developed an algorithm to search peak tables for metabolite-specific peaks using defined criteria.
  • Incorporated options to exclude non-target peaks, such as contaminants.

Main Results:

  • The algorithm successfully sorts peaks by leveraging chromatographic and spectral data.
  • Tested with standard metabolite mixtures and spiked human serum, demonstrating high accuracy.
  • Manual validation confirmed the reliability of the peak sorting method.

Conclusions:

  • The novel peak sorting algorithm significantly enhances the identification of metabolites in GC x GC/TOF-MS analyses.
  • This method offers a robust solution for handling complex datasets and improving the accuracy of comparative metabolomics studies.