Table 2 Comparison of the results of previous electrochemical studies for the determination of L-tryptophan.

From: Electrochemical determination of L-tryptophan in food samples on graphite electrode prepared from waste batteries

Electrode

LOD (µM)

Linear range (µM)

Method

References

aCuCoHCF/graphite electrode

6.0

10.0–900.0

bAMP

36

cNafion/TiO2-GR/GCE

0.7

5.0–140.0

dDPV

37

eCILE/GNP

4.0

5.0–900

fSWE

38

gMWNTs/MGF/GCE

0.87

5.0–30.0

60.0–500

dDPV

39

hNiCoO2/C modifed GCE

5.7

0.0–390.63

390.63–943.4

dDPV

40

Graphite electrode

1.73

5.0–150.0

dDPV

This investigation

  1. aCopper-cobalt hexacyanoferrate film modified graphite electrode; bAmperometry; cGlassy carbon electrode modified with a Nafion/TiO2-graphene composite film; dDifferential pulse voltammetry; eCarbon ionic liquid electrode (CILE) modified with gold nanoparticle (GNP); fSquare wave voltammetry; gA multi-walled carbon nanotubes (MWNTs) bridged mesocellular graphene foam (MGF) nanocomposite(MWNTs/MGF) modified glassy carbon electrode; hCarbon-supported NiCoO2 nanoparticles (NiCoO2/C) modified glassy carbon electrode (GCE).
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