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. 2022 Mar 22;207:114209. doi: 10.1016/j.bios.2022.114209

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Fig. 4 — The detection of SARS-CoV-2 RNA in 120 clinical specimens using DPV and RT-PCR methods. The electrochemical signals are depicted in bar charts based on turn-off (A) and turn-on (B) strategies. Box-diagram for the quantitative detection of SARS-CoV-2 RNA in 120 clinical samples by ssDNA/FGNs/BNQDs/SPCE based on turn-off (C) and turn-on (D) strategies. ROC analysis to assess the detection capability of the biosensor based on turn-off (E) and turn-on (F) strategies.