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. 2022 Jan 10;10:100105. doi: 10.1016/j.biosx.2022.100105

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© 2022 Published by Elsevier B.V.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 4 — (a) The portable PoC device with a smartphone connection by a USB-C connection including sensor attachment. (b) DPVs of the AuNPs-LSG sensor showing ΔIox (the oxidation current change) after each modification and after detecting 200 ng/mL of SARS-CoV-2 S1 and S2 antigens. (c) DPVs showing AuNPs-LSG sensor response for the swabs obtained from COVID-19 positive (+) and negative (−) patients by (i) the portable PoC device and (ii) the commercial potentiostat. (Error bars: ± SD for n = 3 for different sensors). 5.0 mM [Fe (CN)₆]^3–/4– containing 0.1 M PBS and 0.1 M KCl was used as redox buffer at 50 mV/s scan rate.