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Related Experiment Video

Updated: May 18, 2026

Nanosensors to Detect Protease Activity In Vivo for Noninvasive Diagnostics
10:50

Nanosensors to Detect Protease Activity In Vivo for Noninvasive Diagnostics

Published on: July 16, 2018

High sensitive trypsin activity evaluation applying a nanostructured QCM-sensor.

M Stoytcheva1, R Zlatev, S Cosnier

  • 1Universidad Autónoma de Baja California, Instituto de Ingeniería, 21280 Mexicali, México. margarita@iing.mxl.uabc.mx

Biosensors & Bioelectronics
|September 12, 2012
PubMed
Summary
This summary is machine-generated.

A new nanoparticle-based method enhances trypsin activity detection using Quartz Crystal Microbalance (QCM). This sensitive approach improves the limit of detection for enzyme activity determination in diagnostics and biotechnology.

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry

Background:

  • Accurate trypsin activity determination is crucial for medical diagnostics, industry, and biotechnology.
  • Existing methods for trypsin activity assessment often lack the required speed, sensitivity, or ease of use.
  • Quartz Crystal Microbalance (QCM) offers a platform for real-time monitoring but requires enhanced sensitivity for enzyme activity assays.

Purpose of the Study:

  • To develop a rapid, sensitive, and user-friendly method for trypsin activity determination using Quartz Crystal Microbalance (QCM).
  • To enhance the sensitivity of QCM-based trypsin detection by utilizing a novel substrate.
  • To demonstrate the broad applicability of the developed method for various substrate-degrading enzymes.

Main Methods:

  • Development and analytical characterization of a novel QCM-based sensor for trypsin activity.
  • Employment of nanoparticles loaded gelatin as a trypsin substrate deposited on the QCM crystal.
  • Real-time monitoring of enzymatic degradation of the substrate by QCM to evaluate trypsin activity.

Main Results:

  • The proposed method achieves a 10-fold improvement in the limit of detection (LOD) for trypsin activity compared to the classic QCM method.
  • The use of heavy nanoparticles (e.g., Ag nanoparticles) in the gelatin substrate leads to a greater mass decrease upon enzymatic degradation, resulting in a higher sensor frequency response.
  • The enhanced LOD achieved was 7.5×10⁻⁴ U mL⁻¹ compared to 7.5×10⁻³ U mL⁻¹ for the standard QCM method.

Conclusions:

  • The developed nanoparticle-loaded gelatin substrate significantly enhances the sensitivity of QCM for trypsin activity determination.
  • This innovative approach provides a rapid, sensitive, and simple method suitable for various applications in diagnostics and biotechnology.
  • The method's principle is adaptable for detecting other substrate-degrading enzymes, offering broad potential utility.