Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/969
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dc.contributor.authorSingh, Netrapal
dc.contributor.authorDahiya, Bhawna
dc.contributor.authorRadhakrishnan
dc.contributor.authorSrinivasan, venkatraman
dc.contributor.authorPrasad, Tulika
dc.contributor.authorMehta, promod kumar
dc.date.accessioned2023-04-24T13:29:02Z
dc.date.available2023-04-24T13:29:02Z
dc.date.issued2018
dc.identifier.urihttp://hdl.handle.net/123456789/969
dc.description.abstractPurpose: Immuno-PCR (I-PCR), an ultrasensitive method, combines the versatility of ELISA with the exponential amplification capacity of PCR. Coupling of detection antibodies with the reporter DNA is a critical step of I-PCR. Gold nanoparticles (GNPs) and magnetic beads (MBs) are relatively easy to attach with the antibodies and DNA. Therefore, we designed MB-coupled GNP-based I-PCR (MB-GNP-I-PCR) assay for the detection of Mycobacterium tuberculosis antigen. Methods: GNPs were synthesized by chemical reduction and seed-mediated synthesis. Functionalized GNPs were prepared by coupling GNPs with the detection antibodies and reporter DNA and were characterized. Detection limit of M. tuberculosis-specific purified early secreted antigenic target-6 (ESAT-6) (Rv3875) was determined by MB-GNP-I-PCR. Results: Transmission electron microscopy revealed spherical and slightly polydispersed GNPs of ~20 and ~60 nm size. Coupling of antibodies to GNPs was indicated by a shift in absorption maxima from 524 to 534 nm, which was confirmed by transmission electron microscopy. A color reaction with ELISA and the presence of 76 bp product by PCR further validated the coupling of detection antibodies and signal DNA to the functionalized GNPs. Also, attachment of capture antibodies with MBs was confirmed by magneto-ELISA. Detection limit of purified ESAT-6 by MB-GNP-I-PCR was determined to be 10 fg/mL, 105-fold lower than analogous ELISA. Notably, no sample matrix effect was observed in the saliva samples of healthy individuals spiked with the purified ESAT-6. Conclusion: Unlike conventional I-PCR (solid format), MB-GNP-I-PCR (liquid format) is relatively simple with the reduced background signals, which can be further exploited for the clinical diagnosis of tuberculosis.en_US
dc.language.isoenen_US
dc.publisherInternational Journal of Nanomedicineen_US
dc.subjectMB-GNP-I-PCR, functionalized GNPs, ELISA, LODen_US
dc.titleDetection of Mycobacterium tuber culosis purified ESAT-6 (Rv3875) by magnetic bead-coupled gold nanoparticle-based immuno-PCR assayen_US
dc.typeArticleen_US
Appears in Collections:School of Interdisciplinary & Applied Sciences

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