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Related Concept Videos

Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

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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....
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Gas Chromatography: Introduction01:13

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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...
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Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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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.
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Gas Chromatography: Overview of Detectors01:13

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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.
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Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

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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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Mass Spectrum01:23

Mass Spectrum

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A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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Related Experiment Video

Updated: Apr 24, 2026

Qualitative Characterization of the Aqueous Fraction from Hydrothermal Liquefaction of Algae Using 2D Gas Chromatography with Time-of-flight Mass Spectrometry
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Quantifying biomass composition by gas chromatography/mass spectrometry.

Christopher P Long1, Maciek R Antoniewicz

  • 1Department of Chemical and Biomolecular Engineering, Metabolic Engineering and Systems Biology Laboratory, University of Delaware , Newark, Delaware 19716, United States.

Analytical Chemistry
|September 11, 2014
PubMed
Summary

Researchers developed a new gas chromatography/mass spectrometry (GC/MS) method to quantify major microbial biomass components like amino acids, RNA, fatty acids, and glycogen in E. coli. This accurate, single-platform workflow offers advantages for systems microbiology and bioengineering applications.

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Area of Science:

  • Microbiology
  • Analytical Chemistry
  • Biochemistry

Background:

  • Accurate quantification of microbial biomass is crucial for understanding cellular processes.
  • Existing methods for biomass component analysis are often complex and time-consuming.
  • Major biomass components like amino acids, RNA, fatty acids, and glycogen represent a significant portion of cellular dry weight.

Purpose of the Study:

  • To develop and validate a comprehensive method for quantifying four major microbial biomass components.
  • To establish a reliable and accurate single-platform workflow using gas chromatography/mass spectrometry (GC/MS).
  • To provide a tool with widespread applicability in systems microbiology and bioengineering.

Main Methods:

  • Development of methods for quantifying amino acids, RNA, fatty acids, and glycogen.
  • Utilizing gas chromatography/mass spectrometry (GC/MS) for analysis.
  • Employing isotope ratio analysis with fully (13)C-labeled biomass as an internal standard, generated from E. coli grown on [U-(13)C]glucose.

Main Results:

  • A robust GC/MS workflow was established for the simultaneous quantification of key microbial biomass components.
  • The method demonstrated consistency, accuracy, and precision across three distinct E. coli strains.
  • The quantified components (amino acids, RNA, fatty acids, glycogen) account for an estimated 88% of E. coli dry weight.

Conclusions:

  • The developed GC/MS workflow provides a convenient, reliable, and accurate method for microbial biomass composition analysis.
  • This single-platform approach offers significant advantages over existing techniques.
  • The methods are expected to have broad applicability in systems microbiology and bioengineering research.