Journal
BIOSENSORS & BIOELECTRONICS
Volume 83, Issue -, Pages 162-168Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2016.04.054
Keywords
Electrochemical sensor; Immunosensor; Single-domain antibody; Ricin; Thermal-stability
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Funding
- NSF Nanosystems Engineering Research Centre for Advanced Self-Powered Systems of Integrated Sensors and Technologies [1160483]
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Conventional monoclonal and polyclonal antibodies are sensitive to changes in environmental factors such as temperature, pH, humidity, etc. This limits the current cost-effective and portable electrochemical immunosensors in harsh environments. Using Ricin Chain-A, a naturally occurring toxin, as a model analyte we report fabrication of a thermally stable electrochemical immunosensor. Single-domain antibodies (sdAb) or nanobodies have been employed as recognition elements for direct detection of Ricin at temperatures great than 4 degrees C. Immunosensor fabricated using the conventional Ricin monoclonal and polyclonal antibodies have also been demonstrated for comparison. In the case of sdAb immunosensor, Ricin was detected in a linear range of 1 log(fg/mL) - 1 log(mu g/mL) with a sensitivity of 0.07 mu A/log(g/mL)/cm(2) using cyclic voltammetry. The fabricated miniaturized sensors have demonstrated higher shelf life and stability at temperatures up to 40 degrees C. Therefore these electrochemical sensors can be integrated as a part of a portable device for point-of-care immunosensing. (C) 2016 Elsevier B.V. All rights reserved.
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