title: Aptamer functionalized MoS-rGO nanocomposite based biosensor for the detection of Vi antigen.
creator: Pathania, Preeti Kumari
creator: Saini, Jai Kumar
creator: Vij, Shania
creator: Tewari, Rupinder
creator: Sabherwal, Priyanka
creator: Rishi, Praveen
creator: Suri, C Raman
subject: QR Microbiology
description: We report a novel aptamer functionalized MoS-rGO based electrochemical method for Vi polysaccharide antigen mediated detection of enteric fever. Herein, highly selective anti-Vi aptamers were screened from a pool of oligonucleotides using a microtitre based SELEX approach and characterized for its specificity and stability. The MoS-rGO nanocomposite was synthesized using a liquid assisted exfoliation by taking optimum ratio of MoS and rGO. The nanocomposite presented synergistic effect owing to easy biomolecular functionalization and enhanced conductivity. The screened anti-Vi aptamers were embedded on the MoS-rGO nanocomposite via thiol linkage to give a stable biointerface. The developed aptasensor was characterized and further evaluated for its performance with different concentrations of Vi antigen using ferrocene labeled boronic acid as an electroactive probe. The aptasensor responded linearly in the range between 0.1 ng mL to 1000 ng mLwith a detection limit of 100 pg mL, and did not show any cross-reactivity with other bacterial polysaccharides indicating high specificity. The applicability of the developed aptasensor was further validated in urine and sera specimens spiked with Vi antigen.
publisher: Elsevier Science Ltd
date: 2018-12-30
type: Article
type: PeerReviewed
relation: https://linkinghub.elsevier.com/retrieve/pii/S0956-5663(18)30700-0
identifier:   Pathania, Preeti Kumari and Saini, Jai Kumar and Vij, Shania and Tewari, Rupinder and Sabherwal, Priyanka and Rishi, Praveen and Suri, C Raman  (2018) Aptamer functionalized MoS-rGO nanocomposite based biosensor for the detection of Vi antigen.  Biosensors & bioelectronics, 122.  pp. 121-126.  ISSN 1873-4235     
relation: http://crdd.osdd.net/open/2127/