Table 4.

Tolerable excess of different organic compounds on Kyn (0.5 µM) voltammetric signal.

Interfering compounds	Tolerable excess
Kynurenine pathway metabolites
QA, PIC	2000-fold
Kyna	1000-fold
3HAA	100-fold
XA	40-fold
3HKyn	10-fold
AA	Equal concentration
Other tryptophan metabolites
ME	100-fold
IA, 5HIAA	10-fold
IS	4-fold
5-HT	2-fold
Amino acids
Ala, Asn, Asp, Gly, Glu, Leu, Phe, Pro, Ser, Thr, Val	2000-fold
Lys	1000-fold
Arg, Cys, His	200-fold
Trp, Met	40-fold
Tyr	4-fold
Others
Glucose, TA, LA, NAm, NA	2000-fold
OA, CA	1000-fold
UA	200-fold
Vit C, DOP	10-fold