Publication date: Feb 03, 2025

This study presents an innovative fluorescence nanosensor utilizing modified sustainable silica for the ultra-sensitive detection of SARS-CoV-2 IgG antibodies. The sensor employs fluorescent dye-doped silica nanoparticles (FSNPs) synthesized via the sol-gel method and functionalized with rhodamine B as a fluorescent dye. Fourier-transform infrared (FTIR) analysis confirmed the successful immobilization of anti-IgG on the FSNP surface, as evidenced by the characteristic amide I and II peaks at 1641 cm and 1530 cm, respectively. Detection of SARS-CoV-2 IgG antibodies was achieved through the enhanced fluorescence intensity of FSNP-anti-IgG at 582 nm. Optimal detection conditions were established with a 15-minute incubation period, demonstrating a linear detection range from 10 to 10 μg mL and a limit of detection (LOD) of 5. 3 fg mL. This research highlights the potential of modified sustainable silica-based fluorescence nanosensors, particularly those utilizing FSNP-anti IgG, for advancing sensitive, rapid, and cost-effective COVID-19 diagnostics, making them a viable option for pathogen detection in resource-limited settings.

Semantics

Original Article