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Surface-enhanced Raman scattering (SERS) represents a powerful tool in modern diagnostics. However, standard signal tags often lack the sensitivity required for early biomolecule detection. Consequently, a new study introduces a highly sensitive SERS biosensing tumor markers platform. This platform integrates tyramine-mediated aggregation amplification (TMAA) with Au@Ag core-shell nanocubes.
Specifically, researchers functionalized tyramine and 4-mercaptobenzoic acid onto these nanocubes. In the presence of hydrogen peroxide, horseradish peroxidase catalyzes the deposition of these tags. This process triggers signal aggregation, which amplifies the Raman signal significantly. Furthermore, this method achieves a four-fold enhancement compared to conventional SERS tags.
The researchers coupled this TMAA strategy with encoded silica photonic crystal beads. This combination established a multiplex immunosensor capable of detecting alpha-fetoprotein (AFP) and carcinoembryonic antigen (CEA). The results demonstrated wide linear ranges and impressively low detection limits. Specifically, the limits reached 0.85 pg/mL for AFP and 0.12 pg/mL for CEA. Therefore, this technology offers a cost-effective platform for early cancer screening in clinical settings.
TMAA uses an enzymatic reaction to deposit tyramine-functionalized nanocubes onto labeled antibodies. This results in tag aggregation, which provides a significant boost to the Raman signal intensity compared to non-aggregated tags.
The proposed immunosensor achieved remarkably low detection limits of 0.85 pg/mL for alpha-fetoprotein (AFP) and 0.12 pg/mL for carcinoembryonic antigen (CEA), supporting early-stage diagnosis.
Multiplexing allows for the simultaneous detection of multiple biomarkers from a single sample. Consequently, this improves diagnostic accuracy and reduces the time and cost associated with cancer screening.
Disclaimer: This content is for informational and educational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Refer to the latest local and national guidelines for clinical practice.
References
Li J et al. Tyramine-mediated aggregation amplification of Au@Ag nanocubes Raman tags for sensitive multiplex SERS biosensing. Talanta. 2026 Jun 08. doi: undefined. PMID: 42258928.
Gkeka G, et al. SERS Immunosensors for Cancer Markers Detection. PMC. 2023. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10214695/
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Researchers develop a sensitive SERS immunosensor using Au@Ag nanocubes and TMAA for rapid, multiplex detection of tumor markers like AFP and CEA....
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