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Paper-based electroanalytical devices for accessible diagnostic testing

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Abstract

Microfluidic paper-based analytical devices (μPADs) use the passive capillary-driven flow of aqueous solutions through patterned paper channels to transport a sample fluid into distinct detection zones that contain the reagents for a chemical assay. These devices are simple, affordable, portable, and disposable; they are, thus, well suited for diagnostic applications in resource-limited environments. Adding screen-printed electrodes to the detection zones of a μPAD yields a device capable of performing electrochemical assays (an EμPAD). Electrochemical detection has the advantage over colorimetric detection that it is not affected by interference from the color of the sample and can be quantified with simple electronics. The accessibility of EμPADs, however, is limited by the requirement for an external potentiostat to power and interpret the electrochemical measurement. New developments in paper-based electronics may help loosen this requirement. This review discusses the current capabilities and limitations of EμPADs and paper-based electronics, and sketches the ways in which these technologies can be combined to provide new devices for diagnostic testing.

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Acknowledgements

This work was funded by the Bill and Melinda Gates Foundation under award number 51308, the N/MEMS S&T Fundamentals MF3 Center (DARPA), and by a postdoctoral fellowship from the Natural Sciences and Engineering Research Council of Canada (E.J.M.).

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Authors and Affiliations

  1. Department of Chemistry and Chemical Biology, Harvard University, USA

    E. Jane Maxwell

  2. Department of Mechanical and Aerospace Engineering, Rutgers University, USA

    Aaron D. Mazzeo

  3. Wyss Institute of Biologically Inspired Engineering, Harvard University, USA

    George M. Whitesides

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  1. E. Jane Maxwell
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  2. Aaron D. Mazzeo
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  3. George M. Whitesides
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Correspondence to E. Jane Maxwell.

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Maxwell, E.J., Mazzeo, A.D. & Whitesides, G.M. Paper-based electroanalytical devices for accessible diagnostic testing. MRS Bulletin 38, 309–314 (2013). https://doi.org/10.1557/mrs.2013.56

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  • DOI: https://doi.org/10.1557/mrs.2013.56

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