Table 2.

The performance comparison of electrochemical biosensors for detecting miRNA

Type	Material	Capture probe	Detection limit	Linear range	References
Labeled biosensor	AuNPs	Ferrocene/methylene blue/cp-DNA	33 fM	100 fM–100 nM	[37]
	AuNPs/Graphitic carbon nitride nanosheets	Ferrocene/DNAzyme walker	4.3/78.6 aM	100 aM–100 nM	[38]
	Magnetic Nanoparticles/	Biotin/cp-DNA	0.27 aM	1 aM–1 pM	[39]
Label-free biosensor	MXene	Tetrahedral DNA nanostructures	5 pM	5 pM–10 nM	[40]
	poly(L-cysteine)/MoS2	probe DNA	78 fM	100 fM–1 nM	[41]
	ZIF-8/AuNPs	3D DNA walker	29 pM	0.1 nM–10 μM	[42]
	AuNPs/NSF	cp-DNA	46.3 fM	0.1 pM–1 μM	This work