A Voltammetric Sensor Based on NiO Nanoparticle-Modified Carbon-Paste Electrode for Determination of Cysteamine in the Presence of High Concentration of Tryptophan

Table 1

Interference study for the determination of 10.0 µM cysteamine under the optimized conditions.

Species	Tolerant limits; (𝑊Substance/𝑊Cysteamine)
Glucose, fructose, lactose, and sucrose	9000
Valine, methionine, glycine, lucine, histidine, glutamic acid, alanine, glycine, and phenylalanine	800
Li^+, Cl^−, CO3^2−, ClO4^−, SO4^2−, SCN^−, Na^+, Mg^2+, K^+, and Ca^+2	700
Ascorbic acid*, thiourea, urea, and uric acid	400
Starch	Saturation

∗After addition of 1 mM ascorbic oxidase.