Table 1.

Analytical performances.

Metabolite		4-Nitrocatechol	6β-Hydroxytestosterone
Regressive equation		Y = 0.0184X − 0.0042	Y = 0.0880X − 0.0062
r		0.9999	0.9998
Linear range		0.8–51.2 μM	0.1–25.6 μg·mL−1
Precision (RSD, %)	High concentration	0.25	0.22
	Moderate concentration	0.35	0.46
	Low concentration	3.93	0.96
Stability (RSD, %)	High concentration	0.28	0.075
	Moderate concentration	0.80	0.17
	Low concentration	2.63	1.39