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Pubmed for Handhelds

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  • Title: Nanoparticle based DNA biosensor for tuberculosis detection using thermophilic helicase-dependent isothermal amplification.
    Author: Torres-Chavolla E, Alocilja EC.
    Journal: Biosens Bioelectron; 2011 Jul 15; 26(11):4614-8. PubMed ID: 21616654.
    Abstract:
    The present study describes the development of a DNA based biosensor to detect Mycobacterium tuberculosis using thermophilic helicase-dependent isothermal amplification (tHDA) and dextrin coated gold nanoparticles (AuNPs) as electrochemical reporter. The biosensor is composed of gold nanoparticles (AuNPs) and amine-terminated magnetic particles (MPs) each functionalized with a different DNA probe that specifically hybridize with opposite ends of a fragment within the IS6110 gene, which is M. tuberculosis complex (MTC) specific. After hybridization, the formed complex (MP-target-AuNP) is magnetically separated from the solution and the AuNPs are electrochemically detected on a screen printed carbon electrode (SPCE) chip. The obtained detection limit is 0.01 ng/μl of isothermally amplified target (105 bp). This biosensor system can be potentially implemented in peripheral laboratories with the use of a portable, handheld potentiostat.
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