Visual indicator for surfactant abundance in MS-based membrane and general proteomics applications

Area of Science:

• Proteomics
• Analytical Chemistry
• Biochemistry

Background:

• Surfactants in proteomics samples impede enzymatic digestion, chromatography, and mass spectrometry sensitivity.
• Current methods for detecting surfactant residue are often time-consuming and require specialized equipment.
• Ensuring surfactant removal is critical for reliable proteomics data.

Purpose of the Study:

• To develop a rapid, visual, and equipment-free method for detecting surfactant residue in proteomics samples.
• To establish a simple assay for assessing surfactant removal efficiency.
• To validate the utility of the developed method in proteomics workflows.

Main Methods:

• Development of a Visual Indicator for Surfactant Abundance (VISA) assay.
• Detection of visible surfactant pellets in aqueous solutions.
• Testing VISA sensitivity with common surfactants like Triton X-114 and SDS.
• Application of VISA to evaluate surfactant removal post-Triton X-114 extraction and tube-gel electrophoresis.

Main Results:

• VISA detects surfactant residue in aqueous solutions within 5 minutes.
• Detection limits for Triton X-114 and SDS were approximately 0.0005% and 0.0002%, respectively.
• VISA successfully evaluated surfactant removal efficiency in a membrane protein extraction protocol.
• Protein presence did not interfere with VISA sensitivity, confirming its suitability for proteomics.

Conclusions:

• The Visual Indicator for Surfactant Abundance (VISA) provides a rapid and simple method for detecting surfactant residue.
• VISA is suitable for routine use in proteomics labs, enabling quick quality control before mass spectrometry.
• The assay has potential applications beyond proteomics for general surfactant detection and removal protocol assessment.