DNA probe functionalized QCM biosensor based on gold nanoparticle amplification for Bacillus anthracis detection
The results indicate that the DNA probe functionalized quartz crystal microbalance biosensor could recognize the target DNA fragment of B. anthracis from that of its closest species, such as Bacillus thuringiensis, and that the limit of detection reached 3.5 × 102 CFU/ml of B. anthracis vegetative cells just after asymmetric PCR amplification, but without culture enrichment
A DNA probe functionalized quartz crystal microbalance biosensor was developed to detect B. anthracis based on the recognition of its specific DNA sequences, i.e., the 168 bp fragment of the Ba813 gene in chromosomes and the 340 bp fragment of the pag gene in plasmid pXO1
A thiol DNA probe was immobilized onto the QCM gold surface through self-assembly via Au–S bond formation to hybridize with the target ss-DNA sequence obtained by asymmetric PCR
Hybridization between the target DNA and the DNA probe resulted in an increase in mass and a decrease in the resonance frequency of the QCM biosensor
To amplify the signal, a thiol-DNA fragment complementary to the other end of the target DNA was functionalized with gold nanoparticles
The results indicate that the DNA probe functionalized QCM biosensor could recognize the target DNA fragment of B. anthracis from that of its closest species, such as Bacillus thuringiensis, and that the limit of detection reached 3.5 × 102 CFU/ml of B. anthracis vegetative cells just after asymmetric PCR amplification, but without culture enrichment
The DNA probe functionalized quartz crystal microbalance biosensor demonstrated stable, pollution-free, real-time sensing, and could find application in the rapid detection of B
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