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Related Experiment Video

Updated: Oct 22, 2025

In Vesiculo Synthesis of Peptide Membrane Precursors for Autonomous Vesicle Growth

In Vesiculo Synthesis of Peptide Membrane Precursors for Autonomous Vesicle Growth

Published on: June 28, 2019

RapiGest precipitation depends on peptide concentration.

Peter R Mosen¹, Robert Hardt¹, Dominic Winter¹

¹Institute for Biochemistry and Molecular Biology, Medical Faculty, University of Bonn, Bonn, North Rhine-Westphalia, Germany.

|August 28, 2021

Summary

RapiGest surfactant aids protein digestion for mass spectrometry. Its precipitation variability is linked to protein concentration, not hydrolysis efficiency, with intact proteins aiding removal from dilute samples.

Keywords:

RapiGest in solution digestion precipitation proteomics surfactant

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Area of Science:

Biochemistry
Proteomics
Analytical Chemistry

Background:

RapiGest is a mass spectrometry-compatible surfactant that aids enzymatic protein digestion by promoting unfolding.
It is designed to be removed by acid hydrolysis, precipitation, and solid-phase extraction before analysis.
Variability in RapiGest removal has been observed, suggesting sample-dependent factors influence precipitation.

Purpose of the Study:

To investigate the causes of variability in RapiGest precipitation after acid hydrolysis.
To determine the relationship between protein/peptide concentration and RapiGest precipitation.
To develop a strategy for efficient RapiGest removal, especially from dilute samples.

Main Methods:

Acid hydrolysis of RapiGest under various conditions.
In-solution protein digestion experiments with varying protein/peptide concentrations.
Assessment of RapiGest precipitation efficiency.
Testing the use of intact proteins to trigger RapiGest precipitation.

Main Results:

RapiGest hydrolyzes efficiently under acidic conditions.
Precipitation variability is primarily dependent on protein/peptide concentration, not hydrolysis efficiency.
Addition of intact proteins effectively triggers RapiGest precipitation, even in highly diluted samples.

Conclusions:

RapiGest precipitation is sample-dependent, mainly due to protein/peptide concentration.
Efficient removal strategies for RapiGest can be implemented based on sample protein content.
Understanding these factors optimizes RapiGest use in mass spectrometry-based proteomics workflows.