September 25, 2003Science
Nanoparticle-Based Bio-Bar Codes for the Ultrasensitive Detection of Proteins
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Implication
Experimental study demonstrates attomolar protein detection using DNA bio-bar-coded nanoparticle probes, indicating a million-fold sensitivity gain over conventional clinical assays.
Key Points
- To develop an ultrasensitive protein detection platform utilizing magnetic microparticles and DNA-functionalized nanoparticle bio-bar codes.
- Target proteins (prostate-specific antigen, PSA) were captured in a sandwich format using antibody-coated magnetic microparticles and nanoparticle probes loaded with target-specific antibodies and barcode oligonucleotides.
- Target complexes were isolated magnetically, followed by thermal dehybridization to release the barcode oligonucleotides for direct quantification or subsequent polymerase chain reaction amplification.
- Achieved a limit of detection of 30 attomolar for prostate-specific antigen via direct oligonucleotide release and identification.
- Increased detection sensitivity to 3 attomolar when coupling the bio-bar-code assay with polymerase chain reaction amplification.
- Demonstrated sensitivity approximately six orders of magnitude higher than conventional clinical assays, which exhibit a detection limit of approximately 3 picomolar.
Cite This Study
Nam et al. (2003) studied this question.