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

Table 2

Determination of cysteamine in real samples (𝑛=3).

Sample	Added (µM)	Expected (µM)	Founded (µM)	Founded [39] (µM)	𝐹ex	𝐹tab	𝑡ex	𝑡tab
Capsule	—	10.00	9.88±0.32	10.25±0.45	6.5	19	1.9	3.8
	10.00	20.00	20.55±0.56	20.68±0.75	—	—		—
	5.00	25.00	24.95±0.22	25.55±0.50	—	—		—
Urine^a	—	—	<LOD	<LOD	—	—		—
	15.00	15.00	15.65±0.75	15.87±1.00	8.9	19	2.3	3.8
	10.00	25.00	25.79±0.89	25.95±1.04	—	—		—
Urine^b	—	—	5.55±0.45	5.67±0.84	7.5	19	2.1	3.8

aHealthy person.
^bUrine samples of patients undergoing treatment with cysteamine.