Table 2.

Recoveries of the metabolites.

Metabolite	Original	Added	Found	Recovery (%)	RSD (%)
4-Nitrocatechol (μM)	10.9	5	15.4 ± 0.11	89.4 ± 2.27	5.02
	10.9	10	19.7 ± 0.09	87.1 ± 0.85
	10.9	15	25.5 ± 0.17	96.8 ± 1.12
6β-Hydroxytestosterone (μg·mL−1)	0.296	0.15	0.43 ± 0.01	91.5 ± 4.77	4.40
	0.296	0.30	0.55 ± 0.01	85.4 ± 1.01
	0.296	0.45	0.69 ± 0.01	86.9 ± 2.46