Gc-ms Analysis
Gc-ms Analysis - Related Videos
09:22
Gas Chromatography (GC) with Flame-Ionization Detection
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Gas chromatography (GC) is used to separate and detect small molecular weight compounds in the gas phase. The sample is either a gas or a liquid that is vaporized in the injection port. Typically, the compounds analyzed are less than 1,000 Da, because it is difficult to vaporize larger compounds. GC is popular for environmental monitoring and industrial applications because it is very reliable and can be run nearly continuously.
12:49
Mutagenesis and Analysis of Genetic Mutations in the GC-rich KISS1 Receptor Sequence Identified in Humans with Reproductive Disorders
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Cited by 3 •
2011
Mutations in the kisspeptin receptor (KISS1R) are associated with reproductive disorders in patients. Here we describe how to introduce mutations of interest in the GC-rich sequence of KISS1R as well as the use of KISS1R constructs to characterize the degradation pathway of the receptor by immunoprecipitation and western blot.
11:06
GC-based Detection of Aldononitrile Acetate Derivatized Glucosamine and Muramic Acid for Microbial Residue Determination in Soil
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Cited by 40 •
2012
We describe a method protocol for the GC-based analysis of the aldonitrile acetate derivatives of glucosamine and muramic acid extracted from soil. For elucidation of the chemical mechanism, we also present a strategy to confirm the structure of the derivative and the ion fragments formed upon electron ionization.
01:14
Gas Chromatography–Mass Spectrometry (GC–MS)
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2025
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...
11:07
Isolation of Mandibular Gland Reservoir Contents from Bornean 'Exploding Ants' (Formicidae) for Volatilome Analysis by GC-MS and MetaboliteDetector
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Cited by 3 •
2018
Minor workers of the ant species Colobopsis explodens are dissected to isolate the wax-like content stored in their hypertrophied mandibular gland reservoirs for subsequent solvent-extraction and analysis by gas chromatography-mass spectrometry. The annotation and identification of volatile constituents using the open-source software MetaboliteDetector is also described.
FAQs
Separation depends on how each vaporized compound travels through the chromatographic column. Components in a complex sample move through this stage differently, allowing them to become separated before entering the mass spectrometer. This separation reduces overlap among sample constituents and gives each resulting mass spectrum a clearer compound-specific context for interpretation.
Ionization converts each separated compound into ions that can be measured according to their mass-to-charge ratios. The resulting pattern forms a characteristic spectrum associated with that compound. Because spectra provide more than a single signal, researchers can compare these patterns with reference libraries to support identification of components detected in biological samples.
Signal intensity indicates how strongly a compound is represented in the instrument’s measurement. Researchers can use these signals for qualitative studies, such as determining whether a component is present, or for quantitative studies that examine relative amounts. Interpretation therefore combines the detected spectrum with the strength of its signal rather than relying on signal presence alone.
GC-MS combines two complementary types of information. Gas chromatography separates compounds within a complex mixture, while mass spectrometry characterizes the separated compounds through their ion mass-to-charge ratios. Using both stages helps connect a compound’s position in the separation process with its characteristic spectrum, strengthening chemical characterization in biological research.
A typical measurement begins with sample vaporization, followed by passage through a chromatographic column where components separate. Each separated compound then enters the mass spectrometry stage, where it is ionized and its resulting ions are measured by mass-to-charge ratio. Researchers can subsequently examine signal intensity and compare spectra with reference libraries.
In biology, GC-MS can be applied to metabolites and lipids, as well as other biologically relevant molecules. The same analytical approach can also examine environmental contaminants and drugs. This breadth makes the method useful when research requires chemical characterization across biological samples, exposure-related compounds, or substances of pharmaceutical interest.
Reference libraries provide spectra against which measured spectra can be compared. A close comparison can support identification of compounds detected after chromatographic separation, particularly when a complex sample contains multiple constituents. Researchers can then combine the supported identification with signal-intensity information to conduct qualitative or quantitative studies of biologically relevant compounds.