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Size-Exclusion Chromatography

Size-Exclusion Chromatography

In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...

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Size Exclusion Chromatography to Analyze Bacterial Outer Membrane Vesicle Heterogeneity

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Characterization of the Acinetobacter baumannii Secretome Using Size-Exclusion Chromatography and Raman Spectroscopy.

Elizaveta Alekseevna Denisova^1,2, Anastasia Avdyusheva², Elizaveta Tyshchuk^1,2

¹Saint-Petersburg Pasteur Institute, St. Petersburg 197101, Russia.

International Journal of Molecular Sciences

|July 15, 2026

Summary

This study characterizes the secretome of Acinetobacter baumannii, a dangerous multidrug-resistant pathogen. A hybrid chromatography and Raman spectroscopy method identified unique biochemical markers in different fractions, aiding biomarker discovery for virulence and resistance.

Keywords:

Acinetobacter baumannii ESKAPE pathogens Raman spectroscopy bacterial secretome metabolite profiling size-exclusion chromatography virulence factors

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Characterization of Proteins by Size-Exclusion Chromatography Coupled to Multi-Angle Light Scattering (SEC-MALS)

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Characterization of Proteins by Size-Exclusion Chromatography Coupled to Multi-Angle Light Scattering (SEC-MALS)

Published on: June 20, 2019

Area of Science:

Microbiology
Biochemistry
Spectroscopy

Background:

Acinetobacter baumannii is a critical multidrug-resistant pathogen causing nosocomial infections.
Understanding its secreted virulence factors is crucial for combating infections.
Characterizing the A. baumannii secretome is challenging due to spectral overlap.

Purpose of the Study:

To develop and apply a hybrid approach for deconvoluting the A. baumannii secretome.
To identify unique metabolic profiles and potential biomarkers within different secreted fractions.

Main Methods:

Integrated size-exclusion chromatography with Raman spectroscopy.
Fractionated the cell-free supernatant of A. baumannii into seven distinct fractions.
Analyzed spectral data to identify unique biochemical compositions in each fraction.

Main Results:

Fractionation reduced spectral complexity, revealing unique metabolic profiles.
Fraction 3 showed distinct markers for phosphatidylserine, cysteine, phosphatidylinositol, and DNA.
Specific fractions were enriched with markers for glutamine/asparagine, carotenoids, phenylalanine, cysteine-containing proteins, nucleotides, and phospholipids.

Conclusions:

The hybrid approach successfully deconvoluted the complex A. baumannii secretome.
Distinct biochemical specializations were identified across different secreted fractions.
Findings provide a foundation for discovering novel biomarkers for A. baumannii virulence and antibiotic resistance.