Voltammetric Determination of Homocysteine Using Multiwall Carbon Nanotube Paste Electrode in the Presence of Chlorpromazine as a Mediator

Table 4

Concentration values obtained from the proposed and published methods for Hcy analysis in real samples.

Sample	Added (μM)	Expected (μM)	Proposed method (μmol L^−1)	Published method (μmol L^−1)	𝐹ex	𝐹tab, (0.05);2,2	𝑡ex	𝑡tab  (98%)
Urine	—	—	Less than limit of detection	Less than limit of detection	—	—	—	—
	5.00	5.00	4.85±0.31	5.42±0.51	5.8	19	2.3	3.8
	5.00	10.00	10.21±0.44	10.48±0.60	6.2	19	2.5	3.8
	20.00	30.00	30.12±0.25	30.33±0.41	5	19	2.0	3.8
Serum			Less than limit of detection	Less than limit of detection	—	—	—	—
6	50.00	50.00	50.63±0.65	50.87±0.92	8.6	19	3.5	3.8
7	20.00	70.00	70.55±0.58	70.67±0.75	7.0	19	3.0	3.8

𝐹_ex: calculated 𝐹 value; reported 𝐹 value from 𝐹-test table with 95% confidence level and 2/2 degree of freedom; 𝑡_ex: calculated 𝑡;   𝑡_tab (98%): reported 𝑡 value from student’s 𝑡-test table with 98% confidence level.