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Related Concept Videos

Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

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Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
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Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
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Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
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Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation
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Pulse-Operated First-Generation Biosensors with Extended Linear Range for Continuous Glycemia Monitoring in

Maria A Komkova1, Valeria S Kasimovskaya2, Artem A Eliseev1

  • 1Chemistry Faculty of M.V. Lomonosov, Moscow State University, Leninskie Gory, 1/3, Moscow 119991, Russia.

Analytical Chemistry
|August 27, 2025
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Summary

This study presents an improved Prussian Blue biosensor for continuous glucose monitoring. By reducing glucose oxidase and using pulse power, it achieves a wider linear range and stable performance, even in low-oxygen conditions.

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Area of Science:

  • Electrochemistry
  • Biomedical Engineering
  • Biosensor Technology

Background:

  • First-generation biosensors often struggle with limited linear ranges and oxygen dependence.
  • Continuous glucose monitoring requires robust sensors that perform reliably in diverse physiological conditions.

Purpose of the Study:

  • To develop a Prussian Blue (PB) and glucose oxidase (GOx) biosensor with an extended linear calibration range for high glucose concentrations.
  • To enhance sensor performance for continuous monitoring in oxygen-deficient environments, such as interstitial fluid.

Main Methods:

  • Reduced immobilization of glucose oxidase (GOx) to mitigate oxygen deficiency.
  • Implementation of pulse power generation readout for signal amplification.
  • Fabrication of PB-based biosensors for in vivo interstitial fluid glucose monitoring.

Main Results:

  • Achieved a record linear range of 0.5 to 30 mM glucose.
  • Demonstrated high sensitivity exceeding 10 mA M⁻¹ cm⁻².
  • Obtained extinguished dependence on oxygen concentration and improved operational stability.

Conclusions:

  • The developed pulse-operated PB biosensor is suitable for continuous in vivo glucose monitoring.
  • This technology offers a promising solution for glycemia control, particularly in challenging low-oxygen conditions.