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Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents

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Label-Free Biosensor Based on Particle Plasmon Resonance Coupled with Diffraction Grating Waveguide.

Wei-Ting Hsu¹, Yu-Cheng Lin², Huang-Chin Yang¹

¹Department of Chemistry and Biochemistry and Center for Nano Bio-Detection, National Chung Cheng University, Chiayi 62102, Taiwan.

Sensors (Basel, Switzerland)

|September 14, 2024

Summary

This summary is machine-generated.

This study introduces a novel label-free biosensing platform combining particle plasmon resonance (PPR) with diffraction grating waveguides for enhanced biomolecular detection. The integrated system demonstrates high sensitivity and a low detection limit for various analytes.

Keywords:

UV-assisted embossing diffraction grating gold nanoparticle surface label-free biosensing platform particle plasmon resonance

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Area of Science:

Nanotechnology
Biophysics
Optical Sensing

Background:

Particle plasmon resonance (PPR), also known as localized surface plasmon resonance (LSPR), is a key phenomenon in metal nanoparticles used for sensor fabrication.
Diffraction grating waveguides are employed for monitoring bioaffinity adsorption via out-of-plane illumination.
The integration of PPR with diffraction grating waveguides for biomolecular detection remains an underexplored area.

Purpose of the Study:

To introduce and validate a novel label-free biosensing platform that integrates PPR with a diffraction grating waveguide.
To investigate the enhanced sensitivity and detection capabilities of this combined PPR-diffraction system for biomolecular detection.
To demonstrate the practical application of this platform for sensitive and rapid biomolecule quantification.

Main Methods:

Immobilization of gold nanoparticles on a glass slide in contact with the sample.
Positioning of a UV-assisted embossed diffraction grating opposite the gold nanoparticles.
Utilizing diffraction in reflection to detect refractive index changes caused by biomolecular binding.
Measuring the positional shift of the diffracted beam with varying sucrose solution refractive indices.
Confirmation of sensor sensitivity using finite element method (FEM) simulations.

Main Results:

The integrated PPR-diffraction grating waveguide sensor demonstrated a sensitivity of 0.97 mm/RIU.
Achieved a high resolution of 3.1 × 10^-4 refractive index unit.
Established a low detection limit of 4.4 pM for anti-DNP detection.
FEM simulations confirmed the enhanced sensitivity due to PPR-diffraction coupling.

Conclusions:

The developed biosensing platform offers a significant advancement in sensitive, rapid, and label-free biomolecule detection.
The integration of PPR and diffraction grating waveguides provides a synergistic effect, enhancing sensing performance.
This technology holds practical potential for various applications in diagnostics and research.