Plasmonic ELISA for the ultrasensitive detection of disease biomarkers with the naked eye

Roberto De La Rica, Molly M. Stevens

Research output: Contribution to journalArticle

459 Citations (Scopus)

Abstract

In resource-constrained countries, affordable methodologies for the detection of disease biomarkers at ultralow concentrations can potentially improve the standard of living1, 2. However, current strategies for ultrasensitive detection often require sophisticated instruments that may not be available in laboratories with fewer resources3, 4, 5, 6, 7, 8, 9, 10, 11. Here, we circumvent this problem by introducing a signal generation mechanism for biosensing that enables the detection of a few molecules of analyte with the naked eye. The enzyme label of an enzyme-linked immunosorbent assay (ELISA) controls the growth of gold nanoparticles and generates coloured solutions with distinct tonality when the analyte is present. Prostate specific antigen (PSA) and HIV-1 capsid antigen p24 were detected in whole serum at the ultralow concentration of 1 × 10−18 g ml−1. p24 was also detected with the naked eye in the sera of HIV-infected patients showing viral loads undetectable by a gold standard nucleic acid-based test
LanguageEnglish
Pages821–824
Number of pages4
JournalNature Nanotechnology
Volume7
Issue number12
DOIs
Publication statusPublished - Dec 2012

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Immunosorbents
biomarkers
Biomarkers
Antigens
enzymes
Assays
human immunodeficiency virus
Enzymes
antigens
serums
Nucleic acids
Prostate-Specific Antigen
Gold
Nucleic Acids
Labels
nucleic acids
Nanoparticles
Molecules
resources
methodology

Keywords

  • disease detection
  • biomarker
  • enzyme-linked immunosorbent assay

Cite this

De La Rica, Roberto ; Stevens, Molly M. / Plasmonic ELISA for the ultrasensitive detection of disease biomarkers with the naked eye. In: Nature Nanotechnology. 2012 ; Vol. 7, No. 12. pp. 821–824.
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Plasmonic ELISA for the ultrasensitive detection of disease biomarkers with the naked eye. / De La Rica, Roberto; Stevens, Molly M.

In: Nature Nanotechnology, Vol. 7, No. 12, 12.2012, p. 821–824.

Research output: Contribution to journalArticle

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