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Anal Chem. 2005 Nov 1;77(21):6985-8.

Colorimetric bio-barcode amplification assay for cytokines.

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1
Department of Chemistry, University of California, Berkeley, California 94720, USA.

Abstract

The bio-barcode amplification assay has become a powerful tool in detecting tens to hundreds of biological targets such as proteins and nucleic acids in the entire sample. However, current bio-barcode detection schemes still require many experimental steps including microarrayer-based immobilization of oligonucleotides on a glass chip, silver enhancement of immobilized gold nanoparticles on a chip, and light-scattering measurement. Here, we report a colorimetric bio-barcode method that minimizes the above requirements while detecting 30 aM concentrations of cytokines (approximately 3 orders of magnitude more sensitive than conventional nonenzymatic cytokine detection assays). The assay is based on porous microparticles, which enable loading of a large number of barcode DNA per particle, and gold nanoparticle-based colorimetric barcode detection method.

PMID:
16255599
DOI:
10.1021/ac0513764
[Indexed for MEDLINE]
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