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Updated: Nov 2, 2025

Fast Enzymatic Processing of Proteins for MS Detection with a Flow-through Microreactor
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Fast protein analysis enabled by high-temperature hydrolysis.

Yuchen Wang1, Wenpeng Zhang1, Zheng Ouyang1

  • 1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University Beijing 100084 P. R. China ouyang@tsinghua.edu.cn zhangwp116@outlook.com.

Chemical Science
|June 7, 2021
PubMed
Summary

This study introduces an enzyme-free microreactor for rapid protein hydrolysis, enabling direct mass spectrometry analysis. This innovative method significantly reduces sample preparation time for protein biomarker discovery.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Biotechnology

Background:

  • Traditional bottom-up proteomics relies on time-consuming enzymatic digestion and post-digestion processing.
  • Current methods present limitations in speed and efficiency for large-scale protein analysis.

Purpose of the Study:

  • To develop a novel enzyme-free microreaction system for rapid and selective protein hydrolysis.
  • To enable direct analysis of protein digests using nanoESI-mass spectrometry without extensive sample cleanup.

Main Methods:

  • Utilized a microreactor system for high-temperature (∼150 °C) hydrolysis of proteins at aspartyl sites within 2 minutes.
  • Integrated disulfide bond cleavage using a reducing agent for analysis of large proteins.
  • Directly analyzed salt-free protein digests via nanoESI-mass spectrometry.

Main Results:

  • Achieved selective protein hydrolysis at aspartyl sites in just 2 minutes.
  • Demonstrated direct, salt-free analysis of protein digests by nanoESI-MS, eliminating purification steps.
  • Successfully analyzed proteins ranging from 8.5 to 67 kDa, including large proteins like bovine serum albumin.
  • Validated the system for identifying specific peptides from Mycobacterium tuberculosis antigens.

Conclusions:

  • The enzyme-free microreaction system offers a fast, efficient, and direct method for protein analysis.
  • This technology holds potential for point-of-care applications in protein biomarker determination.
  • The method streamlines bottom-up proteomics workflows, enhancing throughput and accessibility.