Table 2.

Linearity, limit of detection (LOD) and limit of quantification (LOQ) of barbiturates.

	Compound	Linearity	r 2	LOQ (ng/mg)	LOD (ng/mg)
UHPLC condition I	Barbital	y = 0.007856x − 0.005332	0.9997	0.02	0.01
	Phenobarbital	y = 0.010555x − 0.01244	0.9998	0.02	0.01
	Amobarbital	y = 0.020249x + 0.023212	0.9991	0.02	0.01
	Pentobarbital	y = 0.00801162x − 0.003577	0.9991	0.02	0.01
	Secobarbital	y = 0.010223x − 0.019752	0.9993	0.02	0.01
	Butalbital	y = 0.011896x − 0.026402	0.9999	0.02	0.01
	Thiopental sodium	y = 0.008356x − 0.043479	0.9995	0.02	0.01
UHPLC condition II	Amobarbital	y = 0.00841701x − 0.01249	0.9999	0.02	0.01
	Pentobarbital	y = 0.00875395x + 0.00236192	0.9998	0.02	0.01