Nonenzymatic detection of bacterial genomic DNA using the bio bar code assay

Haley D. Hill, Rafael A. Vega, Chad A. Mirkin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

116 Scopus citations


The detection of bacterial genomic DNA through a non-enzymatic nanomaterials-based amplification method, the bio bar code assay, is reported. The assay utilizes oligonucleotide-functionalized magnetic microparticles to capture the target of interest from the sample. A critical step in the new assay involves the use of blocking oligonucleotides during heat denaturation of the double-stranded DNA. These blockers bind to specific regions of the target DNA upon cooling and prevent the duplex DNA from rehybridizing, which allows the particle probes to bind. Following target isolation using the magnetic particles, oligonucleotide-functionalized gold nanoparticles act as target recognition agents. The oligonucleotides on the nanoparticle (bar codes) act as amplification surrogates. The bar codes are then detected using the Scanometric method. The limit of detection for this assay was determined to be 2.5 fM, and this is the first demonstration of a bar code-type assay for the detection of double-stranded, genomic DNA.

Original languageEnglish (US)
Pages (from-to)9218-9223
Number of pages6
JournalAnalytical Chemistry
Issue number23
StatePublished - Dec 1 2007

ASJC Scopus subject areas

  • Analytical Chemistry


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