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Simple sodium dodecyl sulfate-assisted sample preparation method for LC-MS-based proteomics applications.

Jian-Ying Zhou¹, Geoffrey P Dann, Tujin Shi

¹Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, United States.

Analytical Chemistry

|February 21, 2012

Summary

This study presents a new method for removing sodium dodecyl sulfate (SDS) during proteomics sample preparation. The simple technique effectively removes SDS, improving LC-MS/MS analysis for various biological samples.

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Single-Cell Proteomics Preparation for Mass Spectrometry Analysis Using Freeze-Heat Lysis and an Isobaric Carrier

Published on: December 9, 2022

Area of Science:

Proteomics
Analytical Chemistry
Biochemistry

Background:

Sodium dodecyl sulfate (SDS) is a common reagent in biological sample extraction.
SDS interferes with Liquid Chromatography-Mass Spectrometry (LC-MS) analyses, particularly reversed-phase LC and electrospray ionization.
Existing methods for SDS removal can be complex or inefficient.

Purpose of the Study:

To develop a simple and effective method for removing SDS during proteomics sample preparation.
To improve the compatibility of SDS-assisted sample preparation with LC-MS/MS analyses.
To enhance proteome coverage for challenging biological samples.

Main Methods:

A novel peptide-level SDS removal step was developed using ion substitution-mediated precipitation with potassium chloride (KCl).
The method was tested for SDS removal efficiency and peptide recovery.
The protocol's compatibility with LC-MS/MS was evaluated using mammalian tissues and bacterial samples.

Main Results:

SDS was removed with high efficiency (>99.9%) from peptide samples.
Excellent peptide recovery (>95%) was achieved for samples with less than 20 microg of peptides.
Proteome coverage comparable to or better than standard methods was obtained for various sample types.

Conclusions:

The SDS-assisted protocol is a practical, simple, and broadly applicable method for proteomics sample processing.
This method is particularly beneficial for solubilizing difficult biological samples.
The developed technique enhances LC-MS/MS analysis by effectively removing SDS interference.