NDLI: Tailored carbon nanotube immunosensors for the detection of microbial contamination.

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Tailored carbon nanotube immunosensors for the detection of microbial contamination.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Prieto-Simón, B. Bandaru, N. M. Saint, C. Voelcker, N. H.
Description	Author Affiliation: Prieto-Simón B ( Mawson Institute, University of South Australia, Australia. Electronic address: Beatriz.prietosimon@unisa.edu.au.); Bandaru NM ( School of Chemical and Physical Sciences, Flinders University, Australia.); Saint C ( SA Water Centre for Water Management and Re-use, University of South Australia, Australia.); Voelcker NH ( Mawson Institute, University of South Australia, Australia. Electronic address: nico.voelcker@unisa.edu.au.)
Abstract	The use of carbon nanotubes (CNTs) as building blocks in the design of electrochemical biosensors has been attracting attention over the last few years, mainly due to their high electrical conductivity and large surface area. Here, we present two approaches based on tailored single-walled CNTs (SWCNTs) architectures to develop immunosensors for the bacteriophage MS2, a virus often detected in sewage-impacted water supplies. In the first approach, SWCNTs were used in the bottom-up design of sensors as antibody immobilization support. Carboxy-functionalised SWCNTs were covalently tethered onto gold electrodes via carbodiimide coupling to cysteamine-modified gold electrodes. These SWCNTs were hydrazide functionalized by electrochemical grafting of diazonium salts. Site-oriented immobilization of antibodies was then carried out through hydrazone bond formation. Results showed microarray electrode behavior, greatly improving the signal-to-noise ratio. Excellent sensitivity and limit of detection (9.3 pfu/mL and 9.8 pfu/mL in buffer and in river water, respectively) were achieved, due to the combination of the SWCNTs' ability to promote electron transfer reactions with electroactive species at low overpotentials and their high surface-to-volume ratio providing a favorable environment to immobilize biomolecules. In the second approach, SWCNTs were decorated with iron oxide nanoparticles. Diazonium salts were electrochemically grafted on iron-oxide-nanoparticle-decorated SWCNTs to functionalize them with hydrazide groups that facilitate site-directed immobilization of antibodies via hydrazone coupling. These magnetic immunocarriers facilitated MS2 separation and concentration on an electrode surface. This approach minimized non-specific adsorptions and matrix effects and allowed low limits of detection (12 pfu/mL and 39 pfu/mL in buffer and in river water, respectively) that could be further decreased by incubating the magnetic immunocarriers with larger volumes of sample. Significantly, both approaches permitted the detection of MS2 to levels regularly encountered in sewage-impacted environments.
ISSN	09565663
Volume Number	67
e-ISSN	18734235
Journal	Biosensors and Bioelectronics
Language	English
Publisher	Elsevier
Publisher Date	2015-05-15
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biosensing Techniques Immunoassay Levivirus Isolation & Purification Water Microbiology Antibodies Chemistry Immunology Electric Conductivity Ferric Compounds Gold Hydrazones Nanotubes, Carbon Journal Article Research Support, Non-u.s. Gov't Discipline Biotechnology
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Medicine Biophysics Biomedical Engineering Biotechnology Electrochemistry

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