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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.

Qualitative Analysis

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...

Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

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...

SDS-PAGE

SDS-PAGE

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Updated: Jun 23, 2026

Mass Spectrometric Analysis of Glycosphingolipid Antigens

Mass Spectrometric Analysis of Glycosphingolipid Antigens

Published on: April 16, 2013

Sodium glycodeoxycholate and glycocholate mixed aggregates in gas and solution phases.

Giulia de Petris¹, Maria Rosa Festa, Luciano Galantini

¹Dipartimento di Chimica, Research Center SOFT-INFM-CNR, and Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, P. le Aldo Moro 5, 00185 Roma, Italy.

The Journal of Physical Chemistry. B

|May 1, 2009

Summary

This study reveals how sodium glycocholate and sodium glycodeoxycholate form aggregates in solution. Sodium glycodeoxycholate promotes larger, cylindrical aggregates, while sodium glycocholate shifts the structure towards smaller, globular forms.

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Immunoglobulin G N-Glycan Analysis by Ultra-Performance Liquid Chromatography

Immunoglobulin G N-Glycan Analysis by Ultra-Performance Liquid Chromatography

Published on: January 18, 2020

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Mass Spectrometric Analysis of Glycosphingolipid Antigens

Mass Spectrometric Analysis of Glycosphingolipid Antigens

Published on: April 16, 2013

Immunoglobulin G N-Glycan Analysis by Ultra-Performance Liquid Chromatography

Immunoglobulin G N-Glycan Analysis by Ultra-Performance Liquid Chromatography

Published on: January 18, 2020

Area of Science:

Biophysical Chemistry
Supramolecular Chemistry
Materials Science

Background:

Bile salts are crucial for biological processes, forming aggregates with varying structures.
Understanding the aggregation behavior of different bile salts is key to their applications.

Purpose of the Study:

To investigate the aggregation, composition, and structure of two-component bile salt aggregates.
To elucidate the roles of sodium glycocholate (NaGC) and sodium glycodeoxycholate (NaGDC) in aggregate formation.

Main Methods:

Electrospray ionization mass spectrometry (ESIMS) for gas-phase analysis.
Small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS) for solution-phase structural analysis.

Main Results:

ESIMS showed NaGDC-rich multimers, deviating from random association, indicating NaGDC's higher aggregation tendency.
SAXS and DLS revealed that increasing NaGC concentration transforms NaGDC aggregates from cylindrical to globular structures.
NaGC effectively inhibits the growth of NaGDC aggregates, altering their morphology and size.

Conclusions:

The study confirms NaGC's ability to modulate NaGDC aggregate structure and size.
Bile salt composition significantly influences aggregate morphology and properties.
Findings provide insights into bile salt self-assembly for potential applications.