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Toward a Plasmon-Based Biosensor throughout a Thermoresponsive Hydrogel.

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This study explores thermoresponsive hydrogels as substrates for in vitro diagnostics (IVD) using AVAC technology. The hydrogels allow gold nanoparticle (AuNP) detection, paving the way for advanced diagnostic devices.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Diagnostic Technology

Background:

  • Thermoresponsive hydrogels offer tunable porosity for nanoparticle integration.
  • Existing in vitro diagnostic (IVD) platforms require compatible substrates for advanced detection methods.
  • AVAC technology provides precise detection of gold nanoparticles (AuNPs).

Purpose of the Study:

  • To evaluate thermoresponsive hydrogels (TSHs) as substrates for AVAC technology in IVD.
  • To ensure hydrogel permeability to AuNPs and non-interference with AVAC detection.
  • To develop a hydrogel-coated silicon platform for enhanced diagnostic applications.

Main Methods:

  • Fabrication of silicon-grafted hydrogel platforms ((Sil)-g-(PNIPAAm-co-MBA)) using varying cross-linker concentrations.
  • Evaluation of hydrogel deposition methods: drop casting (DC), spin coating (SC), and 3D printing (3D).
  • Characterization of hydrogel physical-chemical properties and validation of AuNP detection via AVAC technology.

Main Results:

  • Drop casting yielded a homogeneous, thin hydrogel layer suitable for AVAC technology.
  • The TSH successfully regulated nanoparticle absorption and allowed precise AuNP identification through the hydrogel matrix.
  • The developed hydrogel platform meets prerequisites for integration into sandwich immunoassay devices.

Conclusions:

  • Thermoresponsive hydrogels are viable dynamic substrates for AVAC-based IVD applications.
  • Functionalization of hydrogels with biorecognition groups is the next step for biomarker detection.
  • This approach combines 3D hydrogel structures with digital detection for advanced diagnostics.