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. 2021 Nov 23;188(12):425. doi: 10.1007/s00604-021-05092-6

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© The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 5 — Concentration effect (from 0.01 to 1.00 pg mL⁻¹ SARS-CoV-2 NP) on immunosensor signals, Inset: calibration curve for electrochemical SARS-CoV-2 NP immunosensor (potential range is + 0.0/ + 0.4 V; Parameters are frequency of 100 Hz, pulse amplitude of 25 mV, and scan increment of 5 mV)