Thursday, February 14, 2013

1302.2959 (Mitchell Lerner et al.)

A Carbon Nanotube Immunosensor for Salmonella    [PDF]

Mitchell Lerner, Brett Goldsmith, Ronald McMillon, Jennifer Dailey, Shreekumar Pillai, Shree R. Singh, A. T. Charlie Johnson
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 (<1000 cfu/ml). In contrast, the carrier mobility is affected comparably by Salmonella and other bacteria types, with no sign of saturation even at much larger concentrations (10^8 cfu/ml).
View original: http://arxiv.org/abs/1302.2959

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