Work

Tungsten Oxide-Mediated Photocatalytic Silver Enhancement in a QCM Immunosensor for Alpha-Fetoprotein Detection

Year: 2025

Type: article

Abstract: Accurate and early detection of alpha-fetoprotein (AFP) in human serum is essential for the diagnosis and monitoring of hepatocellular carcinoma and related diseases. In this study, we present a highly sensitive and reproducible quartz crystal microbalance (QCM) immunosensor for the quantitative detection of AFP. The detection strategy is based on a sandwich-type immunoassay coupled with a signal amplification method utilizing photocatalytic silver deposition on tungsten(IV) oxide (WO3) nanoparticles. Since QCM detects resonance frequency shifts induced by mass changes on the sensor surface, the silver-enhanced growth of WO3 nanoparticles enables significant signal amplification, allowing for precise mass-based quantification. Without amplification, the limit of detection (LOD) for AFP using QCM immunosensor was 286 pg/ml, which was significantly improved to 43.7 pg/ml with photocatalytic silver staining. This approach markedly enhances both sensitivity and reproducibility, offering a robust and efficient platform for clinical biomarker detection and early cancer diagnostics.

Source: Biosensors

DOI: 10.3390/bios15110728

Authors: Han Sol Kim, Yu Gyeong Cho, Soo Suk Lee

Institution: Soonchunhyang University

Language: English

Topic: Acoustic Wave Resonator Technologies

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $2,654