4.7 Article

A SERS-based immunoassay for porcine circovirus type 2 using multi-branched gold nanoparticles

Journal

MICROCHIMICA ACTA
Volume 180, Issue 15-16, Pages 1501-1507

Publisher

SPRINGER WIEN
DOI: 10.1007/s00604-013-1032-5

Keywords

Porcine circovirus type 2; Immunoassay; Surface enhanced Raman scattering; Multi-branched gold nanoparticles

Funding

  1. National Natural Science Foundation of China [21175051]
  2. Fundamental Research Funds for the Central Universities [2010PY009, 2010PY139]
  3. natural science foundation of Hubei province innovation team [2011CDA115]

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We report on a facile immunoassay for porcine circovirus type 2 (PCV2) based on surface enhanced Raman scattering (SERS) using multi-branched gold nanoparticles (mb-AuNPs) as substrates. The mb-AuNPs in the immunosensor act as Raman reporters and were prepared via Tris base-induced reduction and subsequent reaction with p-mercaptobenzoic acid (pMBA). They possess good stability and high SERS activity. Subsequently, the modified mb-AuNPs were covalently conjugated to the monoclonal antibody (McAb) against the PCV2 cap protein to form SERS immuno nanoprobes. These were captured in a microtiterplate via a immunoreaction in the presence of target antigens. The effects of antibody concentration, reaction time and temperature on the sensitivity of the immunoassay were investigated. Under optimized assay conditions, the Raman signal intensity at 1,076 cm(-1) increases logarithmically with the concentrations of PCV2 in the concentration ranging from 8 x 10(2) to 8 x 10(6) copies per mL. The limit of detection is 8 x 10(2) copies per mL. Compared to conventional detecting methods such as those based on PCR, the method presented here is rapid, facile and very sensitive.

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