Table 2.

Comparison of specific combinations of SNAs in post-processing of PCR product.

Detection Method	Strategy	Target	Detection Limit	Aggregation Time	Ref.
Colorimetric	As-PCR ssDNA product binds to SNAs.	Template DNA	10 Pg	Several mins	[70]
Colorimetric	As-PCR product as a G-quadruplex DNAzyme.	Genomic DNA	5.6 fg/μL	10 min	[71]
Colorimetric	PCR product and SNAs form triplex DNA.	Short DNA and long DNA	0.5 pM for short DNA 1.0 Pg/L for long DNA	—	[74]
Colorimetric	T7 exonuclease to treat RT-PCR products.	RNA	1 nM	15 min	[80]
Colorimetric	5′-exonuclease treat RT-PCR products.	RNA	6 copies	—	[81]