Abstract
In this study, we report the development of a nanoparticle-enhanced biosensor by integrating both the nanoparticles and immunoassay sensing technologies into a phase interrogation surface plasmon resonance (SPR) system for detecting antigen at a concentration as low as the femtomolar range. Our work has demonstrated that the plasmonic field extension generated from the gold film to gold nanorod (GNR) has led to a drastic sensitivity enhancement. Antibody-functionalized sensing film, together with antibody-conjugated GNRs, was readily served as a plasmonic coupling partner that can be used as a powerful ultrasensitive sandwich immunoassay for cancer-related disease detection. Experimentally, it was found that the bioconjugated GNR labels enhance the tumor necrosis factor alpha (TNF-α) antigen signal with more than 40-fold increase compared to the traditional SPR biosensing technique. The underlying principle was analyzed by simulating the near-field coupling between the sensing film and the GNR. The results have shown that GNRs were readily served as promising amplification labels in SPR sensing technology.
| Original language | English |
|---|---|
| Pages (from-to) | 4858-4864 |
| Number of pages | 7 |
| Journal | ACS Nano |
| Volume | 5 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 28 Jun 2011 |
| Externally published | Yes |
Keywords
- biosensor
- gold nanorod
- surface plasmon resonance
- TNF-α
ASJC Scopus subject areas
- General Materials Science
- General Engineering
- General Physics and Astronomy
