Figure 3.

Possible interference in the case of voltammetric determination of KP metabolites. Working electrode: BDDE modified with Bi film; supporting electrolyte: 0.25 M mixture of CH₃COONH₄ with CH₃COOH (pH 6.5), 0.04 M potassium sodium tartrate, and 0.5 µM Bi(III); registration technique: DPV (for details, see [42]). Concentration of analytes: 3HKyn 10 µM, 3HAA 2 µM, ascorbic acid (Vit C) 50 µM, dopamine (DOP) 20 µM, and uric acid (UA) 2 µM; tyrosine (Tyr) 20 µM, cysteine (Cys) 10 µM, tryptophan (Trp) 2 µM, kynurenine 2 µM, and anthranilic acid (AA) 10 µM.