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Nonenzymatic Sensor for Lactate Detection in Human Sweat.

Nikolay V Zaryanov1, Vita N Nikitina1, Elena V Karpova1

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We developed a novel, enzyme-free sensor for noninvasive hypoxia diagnostics. This sensor detects lactate in sweat with high sensitivity and stability, outperforming traditional enzyme-based devices for clinical and sports applications.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Biosensors

Background:

  • Hypoxia diagnosis often relies on invasive methods.
  • Enzyme-based biosensors for lactate detection face stability issues.
  • Noninvasive monitoring of physiological markers like lactate is crucial for health management.

Purpose of the Study:

  • To develop a stable, nonenzymatic sensor for noninvasive lactate detection.
  • To enable accurate hypoxia diagnostics and monitoring in clinical and sports settings.
  • To overcome the limitations of conventional enzyme-based biosensors.

Main Methods:

  • Electropolymerization of 3-aminophenylboronic acid (3-APBA) on screen-printed electrodes.
  • Imprinting lactate onto the poly(3-APBA) working surface.
  • Impedimetric detection of lactate in human sweat samples.

Main Results:

  • The sensor detected lactate in the range of 3–100 mM with a 1.5 mM detection limit and 2–3 min response time.
  • High sensor stability was demonstrated, with unchanged sensitivity after 6 months of storage.
  • Excellent selectivity for lactate over glucose (Klactateglucose < 3 × 10-2) was achieved.
  • Lactate detection in human sweat correlated well (r > 0.9) with a reference enzyme-based method.

Conclusions:

  • The poly(3-APBA) based enzyme-free sensor offers a stable and sensitive platform for noninvasive lactate monitoring.
  • This technology shows significant promise for applications in clinical diagnostics and sports medicine.
  • The developed sensor provides a viable alternative to enzyme-based devices, addressing their stability limitations.