Table 2.

Electrochemical biosensors previously reported to detect SARS-CoV-2.

Target analyte	Fundament	Method	L.O.D.	Analysis Time	Reference
N-gene	Electropolymerized polyaniline (PANI) nanowires	DPV	3.5 fM	1.5 h	[39]
N-gene	Gold nanoparticles capped with antisense oligonucleotides	Signal conditioning circuit	6.9 copies/µL	5 min	[40]
S and Orf1ab genes	Four-way junction (4-WJ) hybridization	SWV	5.0 ag/µL	1 h	[41]
ORF1ab	MoS2	DPV	1.01 pM	2 h	[22]
ORF1ab	Catalytic hairpin assembly	DPV	26 fM	3 h	[23]
ORF1ab	Gold nanomaterial and MB-CDs	DPV	2.2 aM	1.5 h	Present work