Table 1.

The MS parameters for detecting 10 amino acids in CSF in ESI⁺ mode.

No.	Amino acids	Formula	Parent (m/z)	Daughter (m/z)	Cone (V)	Collision (V)	Retention time (min)
1	Tryptophan	C11H12N2O2	204.96	187.82	12	8	2.43
2	Tyrosine	C9H11NO3	181.90	135.84	20	12	3.15
3	Phenylalanine	C9H11NO2	165.96	119.83	18	10	2.46
4	Glutamate	C5H9NO4	147.90	83.84	20	12	4.32
5	Glutamine	C5H10N2O3	146.90	83.86	26	14	5.03
6	Isoleucine	C6H13NO2	131.90	85.89	28	8	2.51
7	Leucine	C6H13NO2	131.90	85.89	20	8	2.41
8	Taurine	C2H7NO3S	125.84	107.82	40	10	3.32
9	Valine	C5H11NO2	117.90	71.88	24	8	2.91
10	Alanine	C3H7NO2	89.90	43.89	18	6	3.85
11	Phenylalanine-d5 (IS)	C9H6D5NO2	171.16	125.03	22	12	2.46