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Integrated SERS-Based Microdroplet Platform for the Automated Immunoassay of F1 Antigens in Yersinia pestis

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Department of Bionano Technology, Hanyang University, Ansan 15588, South Korea
Division of High-risk Pathogen Research, Center for Infectious Diseases, National Institute of Health, Cheongju 28159, South Korea
§ Department of Chemistry and Applied Biosciences, Institute of Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland
Cite this: Anal. Chem. 2017, 89, 16, 8413–8420
Publication Date (Web):July 24, 2017
Copyright © 2017 American Chemical Society

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    The development of surface-enhanced Raman scattering (SERS)-based microfluidic platforms has attracted significant recent attention in the biological sciences. SERS is a highly sensitive detection modality, with microfluidic platforms providing many advantages over microscale methods, including high analytical throughput, facile automation, and reduced sample requirements. Accordingly, the integration of SERS with microfluidic platforms offers significant utility in chemical and biological experimentation. Herein, we report a fully integrated SERS-based microdroplet platform for the automatic immunoassay of specific antigen fraction 1 (F1) in Yersinia pestis. Specifically, highly efficient and rapid immunoreactions are achieved through sequential droplet generation, transport, and merging, while wash-free immunodetection is realized through droplet-splitting. Such integration affords a novel multifunctional platform capable of performing complex multistep immunoassays in nL-volume droplets. The limit of detection of the F1 antigen for Yersinia pestis using the integrated SERS-based microdroplet platform is 59.6 pg/mL, a value approximately 2 orders of magnitude more sensitive than conventional enzyme-linked immunosorbent assays. This assay system has additional advantages including reduced sample consumption (less than 100 μL), rapid assay times (less than 10 min), and fully automated fluid control. We anticipate that this integrated SERS-based microdroplet device will provide new insights in the development of facile assay platforms for various hazardous materials.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.analchem.7b01822.

    • Additional figures and a table depicting experimental results as discussed in the text. (PDF)

    • Movie showing droplet merging for immunoreactions. (AVI)

    • Movie showing droplet splitting for wash-free immunoassays. (AVI)

    • Movie showing the dispersion for immunodetection. (AVI)

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