Multi-scale silica structures for improved HIV-1 Capsid (p24) antigen detection

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Silica (SiO2) micro- and nanostructures enhance fluorescence signals.
• Previous applications include improved detection of fluorescently labeled proteins and DNA.

Purpose of the Study:

• To investigate the mechanism behind fluorescence signal enhancement in SiO2 nanostructures.
• To develop a theoretical model for the enhancement factor.
• To assess the utility of SiO2 substrates for disease diagnostics.

Main Methods:

• Fabrication of SiO2 nanostructures using thermoplastic shrink wrap film.
• Optical characterization to analyze fluorescence signal intensity.
• Development of a theoretical approximation for the enhancement factor based on scattering.
• Testing SiO2 substrates for detecting the human immunodeficiency virus type 1 (HIV-1) p24 antigen.

Main Results:

• Fluorescence signal enhancements are attributed to increased surface density and light scattering.
• An optimal SiO2 thin layer deposition of 20 nm was identified for improved signal enhancement.
• The SiO2 substrates demonstrated improved limits of detection (LOD) for the HIV-1 p24 antigen.

Conclusions:

• The study elucidates the mechanism of fluorescence enhancement in SiO2 nanostructures.
• Optimized SiO2 substrates show significant potential for sensitive disease diagnostics.
• This technology offers a promising platform for early and accurate detection of viral antigens.