Related Experiment Video
Updated: Jun 1, 2026
Demonstrating a Multi-drug Resistant Mycobacterium tuberculosis Amplification Microarray
Published on: April 25, 2014
Nanoparticle based DNA biosensor for tuberculosis detection using thermophilic helicase-dependent isothermal
Edith Torres-Chavolla1, Evangelyn C Alocilja
1Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, MI 48824, USA.
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.
