Table 1. Optimized multiple-reaction-monitoring (MRM) parameters for GABA, Glu, NE, ACh, DA, 5-HT, HVA, 5-HIAA, DOPAC and DHBA (IS).

Analytes	Q1 (amu)	Q3 (amu)	DP (V)	CE (eV)	tR (min)
GABA	104.1	87.0	30	15	0.83
Glu	148.1	84.1	40	18	0.90
NE	170.1	152.1	30	10	0.96
ACh	146.2	87.1	55	20	1.01
DA	154.0	137.1	20	15	1.12
5-HT	177.1	160.0	45	10	1.91
HVA	183.1	121.2	37	12	3.11
5-HIAA	192.0	146.0	55	20	5.12
DOPAC	169.0	123.0	25	12	4.21
DHBA (IS)	140.1	123.0	40	13	1.51