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Nanotechnology

Novel Noninvasive Glucose Sensor Using Nanoparticles in Tear Fluid Analysis

Strategic Insights

— 1 min read

Researchers at the Universidad Autonoma de Madrid have developed a novel noninvasive and enzyme-free dual sensor for detecting D-glucose in tear fluid analysis. The sensor incorporates NaGdF4:20% Yb3+, 2% Er3+ nanoparticles (YbEr-NPs) immobilized on a porous silicon (PSi) substrate functionalized with a phenylboronic ester molecule. This innovative approach enables the detection of D-glucose concentrations in the tear fluid of diabetic patients, providing a promising solution for noninvasive glucose monitoring.

Key Takeaways:

  • The novel sensor incorporates YbEr-NPs on a PSi substrate, which enables luminescence-based sensing and allows for the detection of D-glucose concentrations in the tear fluid of diabetic patients.
  • The sensor achieved a limit of detection (LoD) of 20 mg/dL using voltammetric analysis and 140 mg/dL using luminescence-based analysis, covering the hyperglycemic range.
  • The interaction between YbEr-NPs and the PSi substrate led to the appearance of new emission bands and increased intensity, attributed to surface defects acting as an additional excitation source.
  • The 556 nm emission band showed a strong dependence on the D-glucose concentration, improving the LoD to 110 mg/dL.
  • The triple-sensing approach offers a promising solution for noninvasive glucose monitoring, enabling detection in both the hypoglycemic and hyperglycemic ranges.
  • The research was financially supported by Comunidad De Madrid and the Spain Ministry of Science And Innovation.
  • The study included a team of researchers from the Universidad Autonoma de Madrid, led by Gabriel Lopez-Pena, Departamento de Fisica Aplicada.

Statistics:

  • The novel sensor achieved a LoD of 110 mg/dL for detecting D-glucose concentrations.
  • The sensor allows for the detection of D-glucose concentrations in the range of 10-70 mg/dL using luminescence-based analysis.
  • The sensor achieved a LoD of 20 mg/dL for detecting D-glucose concentrations using voltammetric analysis.
  • The research was supported by a grant from Comunidad De Madrid and the Spain Ministry of Science And Innovation.

Sources:

  • NewsRx. Researchers' from Universidad Autonoma de Madrid Report Details of New Studies and Findings in the Area of Nanoparticles (Integrating voltammetry and substrate-enhanced luminescence for noninvasive glucose sensing). Nanotechnology Weekly. May 12, 2025; p 1286.
  • Lopez-Pena, G., et al. Integrating voltammetry and substrate-enhanced luminescence for noninvasive glucose sensing. Biosensors and Bioelectronics: X, 2025, 23():100591.

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