Table 2.

Stability of compounds derivatives

Compound	Sample	0 h concentration (µM)	24 h concentration (µM)	Average concentration (µM)	CV (%)
l-Arginine	QC1	4.725	4.333	4.529	8.03
	QC2	105.58	104.92	105.38	1.11
	QC3	196.67	197.19	196.93	3.01
ADMA	QC1	0.0570	0.0527	0.0548	14.65
	QC2	1.088	0.995	1.042	6.99
	QC3	2.512	2.493	2.503	1.83
SDMA	QC1	0.0593	0.0593	0.0593	9.57
	QC2	1.037	1.044	1.041	2.69
	QC3	2.546	2.496	2.521	3.81
l-Citrulline	QC1	1.014	0.982	0.998	4.67
	QC2	19.883	20.249	20.041	2.95
	QC3	50.587	50.308	50.583	3.99
DMA	QC1	0.154	0.150	0.152	3.65
	QC2	0.655	0.604	0.634	9.02
	QC3	7.152	7.513	7.33	5.48

QC quality control