Journal
ACS NANO
Volume 3, Issue 3, Pages 585-594Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn800863w
Keywords
gold nanoparticles; immunosensor; cancer biomarkers; multilabel amplification
Categories
Funding
- NIEHS/NIH [ES013557]
- National Institute of Dental and Craniofacial Research, NIH
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A densely packed gold nanoparticle platform combined with a multiple-enzyme labeled detection antibody-magnetic bead bioconjugate was used as the basis for an ultrasensitive electrochemical immunosensor to detect cancer biomarkers in serum. Sensitivity was greatly amplified by synthesizing magnetic bioconjugates particles containing 7500 horseradish peroxidase (HRP) labels along with detection antibodies (Ab(2)) attached to activated carboxyl groups on 1 mu m diameter magnetic beads. These sensors had sensitivity of 31.5 mu A mL ng(-1) and detection limit (DL) of 0.5 pg mL(-1) for prostate specific antigen (PSA) in 10 mu L of undiluted serum. This represents an ultralow mass DL of 5 fg. PSA, 8-fold better than a previously reported carbon nanotube (CNT) forest immunosensor featuring multiple labels on carbon nanotubes, and near or below the normal serum levels of most cancer biomarkers. Measurements of PSA in cell lysates and human serum of cancer patients gave excellent correlations with standard ELISA assays. These easily fabricated AuNP immunosensors show excellent promise for future fabrication of bioelectronic arrays.
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