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A carbon nanotube immunosensor for Salmonella

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Author(s): Mitchell B. Lerner | Brett R. Goldsmith | Ronald McMillon | Jennifer Dailey | Shreekumar Pillai | Shree R. Singh | A. T. Charlie Johnson

Journal: AIP Advances
ISSN 2158-3226

Volume: 1;
Issue: 4;
Start page: 042127;
Date: 2011;
Original page

ABSTRACT
Antibody-functionalized carbon nanotube devices have been suggested for use as bacterial detectors for monitoring of food purity in transit from the farm to the kitchen. Here we report progress towards that goal by demonstrating specific detection of Salmonella in complex nutrient broth solutions using nanotube transistors functionalized with covalently-bound anti-Salmonella antibodies. The small size of the active device region makes them compatible with integration in large-scale arrays. We find that the on-state current of the transistor is sensitive specifically to the Salmonella concentration and saturates at low concentration (
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