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

Zhihui Luo, Wentao Li, Donglian Lu, Kun Chen, Qigai He, Heyou Han*, Mingqiang Zou

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)1501-1507
    Number of pages7
    JournalMicrochimica Acta
    Volume180
    Issue number15-16
    DOIs
    Publication statusPublished - Nov 2013

    Funding

    The authors gratefully acknowledge the financial support for this research from National Natural Science Foundation of China (21175051), the Fundamental Research Funds for the Central Universities (2010PY009, 2010PY139) and the natural science foundation of Hubei province innovation team (2011CDA115).

    Keywords

    • Porcine circovirus type 2
    • Immunoassay
    • Surface enhanced Raman scattering
    • Multi-branched gold nanoparticles
    • ENHANCED RAMAN-SCATTERING
    • MULTISYSTEMIC WASTING SYNDROME
    • HIGH-YIELD SYNTHESIS
    • SILVER
    • SPECTROSCOPY
    • DIAGNOSIS
    • PROTEIN
    • ROUTE
    • PIGS

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