Fast Enzymatic Processing of Proteins for MS Detection with a Flow-through Microreactor

Area of Science:

• Biochemistry
• Analytical Chemistry
• Proteomics

Background:

• Mass spectrometry (MS)-based protein analysis typically requires enzymatic digestion to produce peptides within the instrument's detection range.
• Conventional enzymatic digestion protocols are time-consuming, often taking overnight.
• Recent advancements aim to accelerate this process using microreactors or physical methods.

Purpose of the Study:

• To develop a simple, cost-effective, and rapid enzymatic protein digestion method for mass spectrometry.
• To enable on-line detection of tryptic peptides directly after digestion.

Main Methods:

• Proteins are adsorbed onto C18-bonded reversed-phase HPLC silica particles packed in a capillary column.
• Trypsin in aqueous buffer is infused over the particles for a short digestion period.
• Tryptic peptides are eluted directly into the MS ion source using a solvent gradient.

Main Results:

• Achieved rapid protein digestion in minutes.
• Enabled complete sample analysis in approximately 30 minutes.
• Avoided the need for expensive immobilized enzymes or external aids.

Conclusions:

• This method offers a fast, economical, and accessible approach for enzymatic protein digestion.
• Facilitates streamlined workflows for on-line mass spectrometry-based protein analysis.
• Reduces sample preparation time significantly compared to conventional methods.