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Related Experiment Video

Updated: Jan 23, 2026

Defining Substrate Specificities for Lipase and Phospholipase Candidates
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Simple impedimetric sensor for rapid lipase activity quantification.

Roumen Zlatev1, Margarita Stoytcheva1, Benjamin Valdez1

  • 1Universidad Autónoma de Baja California, Instituto de Ingeniería, Blvd. B. Juárez s/n, 21280, Mexicali, BC, Mexico.

Talanta
|June 17, 2019
PubMed
Summary

A novel impedimetric sensor rapidly quantifies industrial lipase activity. This biosensor utilizes a nanocomposite substrate on a PCB electrode, offering a simple and effective method for enzyme analysis in milk industry samples.

Keywords:
Disposable/regenerable sensorLipase activity quantificationNanocomposite

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Area of Science:

  • Biosensor technology
  • Enzyme activity quantification
  • Nanocomposite materials

Background:

  • Industrial processes require accurate enzyme activity monitoring.
  • Existing methods for lipase quantification can be time-consuming or complex.
  • Development of rapid, sensitive, and cost-effective biosensors is crucial.

Purpose of the Study:

  • To develop and characterize a simple, rapid impedimetric sensor for industrial lipase activity.
  • To utilize a nanocomposite substrate on a disposable/regenerable PCB electrode.
  • To enable real-time monitoring of lipase-catalyzed hydrolysis.

Main Methods:

  • Fabrication of a PCB stick electrode with a sensitive nanocomposite layer.
  • Impedimetric measurement of impedance changes due to substrate hydrolysis.
  • Monitoring AC current phase shift variations over time as the sensor response.
  • Characterization of linear quantification range, LOD, precision, and response time.

Main Results:

  • The sensor demonstrated a linear quantification range from 0.99x10-2 to 1.68 U.S.P. U mL-1.
  • Response times ranged from 80 to 6 seconds with low relative errors (1.24%–3.75%).
  • A limit of detection (LOD) of 8x10-3 U.S.P. U mL-1 was achieved.
  • Quantification of lipase in spiked whey samples showed good agreement with a titrimetric method (error < 4.5%).

Conclusions:

  • The developed impedimetric sensor is effective for rapid and simple lipase activity quantification.
  • The sensor shows high sensitivity, precision, and a fast response time.
  • This technology is suitable for application in the milk industry for enzyme analysis.