Colorimetric Detection of MPT64 Antibody Based on an Aptamer Adsorbed Magnetic Nanoparticles for Diagnosis of Tuberculosis
- Authors
- Cheon, Hong Jae; Lee, Sang Min; Kim, Seong-Rok; Shin, Ho Yun; Seo, Yiel Hea; Cho, Yong Kyun; Lee, Sang Pyo; Kim, Moon Il
- Issue Date
- Feb-2019
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Tuberculosis; MPT64 Antibody; Aptamer; Magnetic Nanoparticles; Peroxidase Mimic; Colorimetric Biosensors
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.19, no.2, pp.622 - 626
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 19
- Number
- 2
- Start Page
- 622
- End Page
- 626
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/1873
- DOI
- 10.1166/jnn.2019.15905
- ISSN
- 1533-4880
- Abstract
- We have developed a colorimetric biosensing system for the detection of antibody against MPT64, a protein secreted by Mycobacterium tuberculosis, using aptamer DNA adsorbed Fe3O4 magnetic nanoparticles (MNPs) for diagnosis of tuberculosis (TB). In this system, MNPs were first incubated with single stranded (ss) DNA-type aptamer having a high affinity toward target antibody against MPT64 (anti-MPT64), resulting in quick inhibition of the peroxidase-like activity of MNPs via the adsorption of aptamer on the surface of MNPs. By the addition of sample solutions containing anti-MPT64, aptamer bound on the surface of MNPs would strongly interact with free anti-MPT64 and be detached from the MNPs, thereby increasing the available surface area of the MNPs and consequently yielding enhanced peroxidase activity. Using this strategy, target anti-MPT64 was successfully detected by displaying increased colorimetric intensities from the higher oxidation of employed peroxidase substrate, 2,2'-azino-bis(3-ethylbenzo-thiazoline-6-sulfonic acid) (ABTS). Based on these results, we anticipate that aptamer adsorbed MNPs can serve as a potent probe system for the detection of clinically important target molecules.
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