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Exploring the electrochemical behaviour of digestive enzymes at a liquid|liquid micro-interface array.

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Summary

Electrochemical methods at liquid/liquid micro-interfaces enable sensitive detection of the digestive enzymes trypsin and pepsin. Stripping voltammetry significantly improves detection limits for these important biomolecules.

Keywords:
Label-free detectionLiquid–liquid interfacePepsinTrypsinVoltammetry

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Biochemistry

Background:

  • Trypsin and pepsin are key digestive enzymes crucial for protein breakdown.
  • Understanding their electrochemical behavior is vital for developing new detection methods.
  • Liquid/liquid (L|L) micro-interfaces offer unique platforms for studying biomacromolecules.

Purpose of the Study:

  • To investigate the electrochemical behavior and detection of trypsin and pepsin.
  • To evaluate the efficacy of liquid/liquid (L|L) micro-interface arrays for protein analysis.
  • To compare the electrochemical characteristics of trypsin and pepsin.

Main Methods:

  • Utilized cyclic voltammetry (CV) and adsorption stripping voltammetry (AdSV).
  • Employed a liquid/liquid (L|L) micro-interface array setup.
  • Investigated protein electroactivity in 10 mM hydrochloric acid.
  • Assessed protein impact on ion transfer using tetrapropylammonium ion (TPrA+).

Main Results:

  • Both trypsin and pepsin were electroactive in 10 mM HCl.
  • AdSV enabled sub-micromolar detection, surpassing CV's 30 μM limit.
  • Pepsin exhibited ill-defined electrochemical behavior and significantly impeded ion transfer.
  • Trypsin showed minimal impedance to ion transfer, indicating distinct properties.

Conclusions:

  • Electrochemical analysis at L|L micro-interfaces is a viable tool for studying biomacromolecules.
  • Adsorption stripping voltammetry offers enhanced sensitivity for trypsin and pepsin detection.
  • Distinct electrochemical behaviors of trypsin and pepsin were observed, highlighting their differences.