The ability to detect biomarkers with ultrahigh sensitivity radically transformed biology and disease diagnosis. However, owing to incompatibilities with infrastructure in current biological and medical laboratories, recent innovations in analytical technology have not yet been adopted broadly. Here, we report a simple, universal ‘add-on’ technology (dubbed EASE) that converts the ordinary sensitivities of common bioassays to extraordinary ones, and that can be directly plugged into the routine practices of current research and clinical laboratories. The assay relies on the bioconjugation capabilities and ultrafast and localized deposition of polydopamine at the target site, which permit a large number of reporter molecules to be captured and lead to detection-sensitivity enhancements exceeding three orders of magnitude. The application of EASE in the ELISA-based detection of the HIV antigen in blood from patients leads to a sensitivity lower than 3 fg ml−1. We also show that EASE allows for the direct visualization, in tissues, of the Zika virus and of low-abundance biomarkers related to neurological diseases and cancer immunotherapy.
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This work was supported in part by the NIH (R21CA192985, R01AI100989, AI083019, AI104002, and AI060389) and the Department of Bioengineering at the University of Washington. J.L. thanks the Howard Hughes Medical Institute for a student fellowship. We are also grateful to B. Lutz and D. Leon for help with the lateral flow test, and P. Zrazhevskiy for discussions on immunostaining.
The authors declare no competing financial interests.
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Li, J., Baird, M., Davis, M. et al. Dramatic enhancement of the detection limits of bioassays via ultrafast deposition of polydopamine. Nat Biomed Eng 1, 0082 (2017). https://doi.org/10.1038/s41551-017-0082
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