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Microbial Biosensors01:17

Microbial Biosensors

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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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Urea Cycle01:23

Urea Cycle

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The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
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Updated: Mar 25, 2026

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
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A Novel Conductometric Urea Biosensor with Improved Analytical Characteristic Based on Recombinant Urease Adsorbed on

T P Velychko1,2, О О Soldatkin3, V G Melnyk4

  • 1Institute of Molecular Biology and Genetics of NAS of Ukraine, Zabolotnogo Street 150, 03143, Kyiv, Ukraine. taras.velychko@gmail.com.

Nanoscale Research Letters
|February 26, 2016
PubMed
Summary

A new conductometric biosensor for urea detection was developed using recombinant urease immobilized on silicalite. This simple, reproducible biosensor is effective for urea analysis in renal dialysis.

Keywords:
BiosensorConductometryEnzymeRecombinant ureaseSilicalite

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Area of Science:

  • Biotechnology
  • Biosensor Technology
  • Analytical Chemistry

Background:

  • Urea detection is crucial for monitoring kidney function, particularly in patients undergoing renal dialysis.
  • Existing methods for urea detection can be complex or time-consuming.
  • Development of rapid, reliable, and cost-effective biosensors is an ongoing area of research.

Purpose of the Study:

  • To develop a novel conductometric biosensor for efficient urea detection.
  • To utilize a unique method for immobilizing recombinant urease on nanoporous silicalite particles.
  • To evaluate the performance and stability of the developed biosensor for potential clinical applications.

Main Methods:

  • Recombinant urease was immobilized onto nanoporous silicalite particles via adsorption.
  • A conductometric biosensor was fabricated using the immobilized urease.
  • The biosensor's performance was characterized, including its linear range, limit of detection, and stability.
  • Urea analysis was performed on samples relevant to renal dialysis.

Main Results:

  • The developed biosensor demonstrated a linear range for urea determination from 0.05 to 15 mM.
  • A low limit of urea detection of 20 μM was achieved.
  • The biosensor exhibited high reproducibility (RSD = 5.1%) and stability for 19 days.
  • The biosensor was successfully applied to urea analysis in the context of renal dialysis.

Conclusions:

  • A novel and effective conductometric biosensor for urea detection has been successfully developed.
  • The biosensor offers advantages such as simplicity, speed, and the absence of toxic compounds in its preparation.
  • The developed biosensor shows significant potential for practical application in urea analysis during renal dialysis.