Abstract
Picogram levels of antibodies against the protective antigen (PA) of Bacillus anthracis were detected in an automated electrochemical sandwich-type enzyme-linked immunosorbant assay. The antibodies were captured and detected using an 8 × 3 array of 50-μm-diameter cavities. The reagent and sample volumes were as low as 200 nL in a less than 25-min assay from capture to signal generation. The electrochemical detection of the antibodies was demonstrated at 0.05–10 μg/mL containing only 10–5,000 pg antibodies. The limit of detection is 10 fg for a 200-nL sample. Detection of anti-PA immunoglobulin G performed in spiked normal human serum and fresh whole human blood did not show a significant difference from detection in a buffer. The initial automation of the assay involved the use of a digital syringe pump for the delivery of reagents to the capture surface.
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Acknowledgements
We are grateful to the National Science Foundation for financial support (NSF DMI no. 0441594). We thank the University of Arkansas for use of equipment and facilities in the Department of Chemistry and Biochemistry and for use of the microfabrication facilities at the High Density Electronics Center. We also thank the University of Arkansas Statewide Mass Spectrometry Facility for analysis of PAPP. We acknowledge Emily Clark and Prabhu Arumugam for fabrication of the chips, Jana Gertsch for maintenance of laboratory supplies, and Dmitri Brevnov for discussions.
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Aguilar, Z.P., Sirisena, M. Development of automated amperometric detection of antibodies against Bacillus anthracis protective antigen. Anal Bioanal Chem 389, 507–515 (2007). https://doi.org/10.1007/s00216-007-1448-z
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DOI: https://doi.org/10.1007/s00216-007-1448-z