Table 4.

Method validation parameters.

Compound	R 2	%RSD	LOD ( μ g/L)	LOQ ( μ g/L)
13 C3-Caffeine	0.9995	1	0.03	0.102
CIP	0.9997	26.28	0.06	0.18
OFL	0.9997	18.07	0.05	0.15
NOR	0.9991	8.49	0.04	0.12
TCN	0.9994	24.72	1.66	5.02
ATE	0.9979	7.34	0.4	1.22
TCS	0.9999	101.92	0.17	0.51
TCC	0.9997	101.92	0.07	0.22
DIC	0.9992	32.08	0.05	1.23
ACE	0.9999	28.6	0.13	0.38
IBU	0.9999	12.51	0.19	0.59
KET	0.9991	67.5	0.07	0.23
E1	0.9996	25.97	0.79	2.41
E3	0.9988	10.22	1.3	3.93
β -E2	0.9993	81.07	0.38	1.71
EE2	0.9992	23.66	0.6	1.82
13 C3-E1	0.9995	4.19	0.11	0.33

LOD: limit of detection; LOQ: limit of quantification; RSD: relative standard deviation.