Au–Ag assembled on silica nanoprobes for visual semiquantitative detection of prostate-specific antigen

Hyung Mo Kim, Jaehi Kim, Jaehyun An, Sungje Bock, Xuan Hung Pham, Kim Hung Huynh, Yoonsik Choi, Eunil Hahm, Hobeom Song, Jung Won Kim, Won Yeop Rho, Dae Hong Jeong, Ho Young Lee, Sangchul Lee, Bong Hyun Jun

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Background: Blood prostate-specific antigen (PSA) levels are widely used as diagnostic biomarkers for prostate cancer. Lateral-flow immunoassay (LFIA)-based PSA detection can overcome the limitations associated with other methods. LFIAbased PSA detection in clinical samples enables prognosis and early diagnosis owing to the use of high-performance signal reporters. Results: Here, a semiquantitative LFIA platform for PSA detection in blood was developed using Au–Ag nanoparticles (NPs) assembled on silica NPs (SiO2@Au–Ag NPs) that served as signal reporters. Synthesized SiO2@Au–Ag NPs exhibited a high absorbance at a wide wavelength range (400–800 nm), with a high scattering on nitrocellulose membrane test strips. In LFIA, the color intensity of the test line on the test strip differed depending on the PSA concentration (0.30–10.00 ng/mL), and bands for the test line on the test strip could be used as a standard. When clinical samples were assessed using this LFIA, a visual test line with particular color intensity observed on the test strip enabled the early diagnosis and prognosis of patients with prostate cancer based on PSA detection. In addition, the relative standard deviation of reproducibility was 1.41%, indicating high reproducibility, and the signal reporter showed good stability for 10 days. Conclusion: These characteristics of the signal reporter demonstrated the reliability of the LFIA platform for PSA detection, suggesting potential applications in clinical sample analysis. [Figure not available: see fulltext.]

Original languageEnglish
Article number73
JournalJournal of Nanobiotechnology
Issue number1
StatePublished - Dec 2021


  • Colloid gold nanoparticle
  • Colorimetric assay
  • Lateral-flow immunoassay
  • Nanoparticle
  • Prostate cancer
  • Prostate-specific antigen


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