Table 6.

Summary of biosensors based on SEPs for the determination of FA in various samples.

Analyte	Technique	LOD	Working Range	Sample	Ref.
Vitamin B9 in real specimens.	SPE modified with La+3/Co3O4 nano-cubes.	0.3 µM	1–600 µM	Human urine samples, tablet.	[58]
N-acetylcysteine in the presence of paracetamol and folic acid	CPE modified with Pt-Co nanoparticles and 2-(3,4 dihydroxy phenethyl) isoindoline-1,3-dione	0.04 µM	0.08–650 µM	Human urine samples, tablet.	[59]
Simultaneous determination of sulfisoxazole and folic acid.	CuO Nanoparticles decorated on SWCNT nanocomposite modified CPE.	0.8 µM	0.07–500 µM	Human urine and tablet.	[59]
Folic acid in real specimens.	SPE modified with Graphene Oxide Nanoribbons	0.02 µM	0.1–1600 µM	Human urine samples, tablet	[60]
Folic acid in real specimens.	Mn-zeolite/Graphite modified Screen-printed Carbon Electrode	0.003 µM	0.004–1 µM	Pharmaceutical samples	[61]
Folic acid in real specimens.	SPE modified using GNS-MoS2-AuNPs	38.5 nM	50 nM–1150 µM	Human urine	[62]
Simultaneous determination of folic acid and epinephrine	Graphite SPE modified with Fe3O4@SiO2	1 μM	5–1000 μM	Human blood serum and urine	[63]
Folic acid in real specimens.	SPE modified with NiFe2O4 nanoparticles	0.034 μM	0.1–500 μM	Human urine	[64]