Triple lines gold nanoparticle-based lateral flow assay for enhanced and simultaneous detection of Leishmania DNA and endogenous control

Lourdes Rivas, Alfredo de la Escosura-Muñiz, Lorena Serrano, Laura Altet, Olga Francino, Armand Sánchez, Arben Merkoçi

Research output: Contribution to journalArticleResearchpeer-review

44 Citations (Scopus)

Abstract

© 2015, Tsinghua University Press and Springer-Verlag Berlin Heidelberg. A novel triple lines lateral-flow assay (LFA) with enhanced sensitivity for the detection of Leishmania infantum DNA in dog blood samples was designed and successfully applied. The enhanced LFA methodology takes advantage of the gold nanoparticle tags (AuNPs) conjugated to polyclonal secondary antibodies, which recognize anti-FITC antibodies. The polyclonal nature of the secondary antibodies allows for multiple binding to primary antibodies, leading to enhanced AuNP plasmonics signal. Furthermore, endogenous control consisting of the amplified dog 18S rRNA gene was introduced to avoid false negatives. Using this strategy, 0.038 spiked Leishmania parasites per DNA amplification reaction (1 parasite/100 μL of DNA sample) were detected. Detection limit of LFA was found to be lower than that of the conventional techniques. In summary, our novel LFA design is a universal and simple sensing alternative that can be extended to several other biosensing scenarios. [Figure not available: see fulltext.]
Original languageEnglish
Pages (from-to)3704-3714
JournalNano Research
Volume8
DOIs
Publication statusPublished - 22 Sep 2015

Keywords

  • Leishmania DNA
  • endogenous control
  • gold nanoparticles
  • lateral-flow assay
  • secondary antibodies

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