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Gas Chromatography–Mass Spectrometry (GC–MS)

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: Introduction

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.

Supercritical Fluid Chromatography

Supercritical Fluid Chromatography

Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...

Gas Chromatography: Types of Detectors-I

Gas Chromatography: Types of Detectors-I

There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...

Gas Chromatography: Types of Columns and Stationary Phases

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: Types of Detectors-II

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...

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A Lipid Extraction and Analysis Method for Characterizing Soil Microbes in Experiments with Many Samples

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An improved method for determining medium- and long-chain FAMEs using gas chromatography.

Zhidong Xu¹, Kevin Harvey, Thomas Pavlina

¹Methodist Research Institute, Clarian Health, Indiana University School of Medicine, Indianapolis, IN 46202, USA.

|January 19, 2010

Summary

This study presents an improved method for analyzing fatty acid methyl esters (FAMEs) in clinical formulations, accurately determining medium- and long-chain fatty acids. The new protocol enhances safety and precision for lipid emulsion analysis.

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Area of Science:

Analytical Chemistry
Biochemistry

Background:

Existing one-step acetyl chloride (AC) catalyzed transesterification methods struggle to accurately quantify medium- and long-chain fatty acids in clinical lipid formulations.
Current protocols face challenges including exothermic reactions, sample loss, PUFA degradation, and inaccurate FID responses, leading to under- or over-estimation of specific fatty acids.

Purpose of the Study:

To develop an improved one-step transesterification method for accurate simultaneous determination of fatty acids (C6-C24) in clinical formulations and functional foods.
To address the limitations of existing methods concerning safety, sample stability, and detector response variability.

Main Methods:

Developed a modified one-step transesterification procedure involving AC addition in a dry ice bath, room temperature transesterification, and data analysis using relative response factors.
Analyzed the fatty acid composition of lipid emulsions (Omegaven, Lipidem) using Shimadzu GC2010 gas chromatography with a Zebron ZB-WAX plus capillary column.

Main Results:

The improved method successfully determined fatty acid profiles (C6-C24) in lipid emulsions.
The protocol mitigates issues like exothermic reactions and PUFA degradation, leading to more accurate quantification.

Conclusions:

The enhanced transesterification method provides accurate and reliable determination of a wide range of fatty acids in lipid emulsions and functional foods.
This improved protocol offers a safer and more precise alternative for clinical and nutritional analysis.