Table 2.

UPLC-MS/MS quantitation data for six analytes.

Analyte	Linearity range (ng/mL)	R2	LOD (ng/mL)	LOQ (ng/mL)
Tryptamine	0.24–24	0.9975	0.08	0.24
5-Hydroxytryptophan	0.45–45	0.9984	0.15	0.45
Serotonin	0.36–360	0.9988	0.12	0.36
N-acetylserotonin	0.18–18	0.9985	0.06	0.18
Melatonin	0.12–1.2	0.9984	0.04	0.12
Tryptophan-ethyl ester	0.1–10	0.9979	0.03	0.1

LOD, limit of detection; LOQ, limit of quantification.