Table 1.

Amino acid levels in L. chinense and L. barbarum.

No.	Amino Acid	Retention Time	Selected Ions 1 (m/z)			Amount (ng/mg, Mean ± SD)		Normalized Value 2
						L. barbarum	L. chinense
1	Alanine	5.17	190	218	260	2187.6 ± 67.8	565.2 ± 13.6	0.26
2	Glycine	5.40	176	204	246	36.5 ± 1.1	132.9 ± 1.0	3.64
3	α-Aminobutyric acid	6.06	130	204	232	12.9 ± 0.3	29.2 ± 0.6	2.27
4	Valine	6.51	144	218	246	290.3 ± 10.4	412.8 ± 15.2	1.42
5	Leucine	7.37	158	232	260	234.1 ± 8.0	683.4 ± 7.2	2.92
6	Isoleucine	7.62	158	232	260	55.7 ± 1.5	400.7 ± 5.7	7.19
7	Proline	8.09	142	216	244	9798.5 ± 242.4	2931.3 ± 106.0	0.30
8	γ-Aminobutyric acid	8.12	186	201	346	121.4 ± 4.2	1108.0 ± 31.3	9.13
9	Pipecolic acid	8.81	156	230	258	61.0 ± 1.7	97.6 ± 5.0	1.60
10	Pyroglutamic acid	10.25	272	300	342	653.7 ± 20.6	240.0 ± 8.7	0.37
11	Serine	11.03	216	302	348	514.0 ± 59.5	530.8 ± 42.9	1.03
12	Threonine	11.12	230	248	261	159.6 ± 33.2	146.2 ± 17.7	0.92
13	Phenylalanine	12.17	195	205	294	39.1 ± 1.7	440.7 ± 17.9	11.28
14	Cysteine	12.58	216	276	322	157.8 ± 0.5	158.7 ± 0.3	1.01
15	Aspartic acid	12.81	287	330	287	330	1079.9 ± 24.0	0.85
16	N-Methyl-DL-aspartic acid	13.01	244	287	390	40.5 ± 1.7	23.1 ± 0.5	0.57
17	Homocysteine	13.85	234	290	336	81.2 ± 7.6	56.5 ± 0.3	0.70
18	Glutamic acid	14.18	288	344	390	346.2 ± 15.3	559.5 ± 31.9	1.62
19	Asparagine	14.47	286	329	375	3460.4 ± 146.9	15211.9 ± 1141.6	4.40
20	α-Aminoadipic acid	15.36	302	358	404	33.6 ± 0.1	39.4 ± 0.7	1.17
21	Glutamine	15.71	287	343	389	7462.7 ± 588.4	1468.8 ± 119.1	0.20
22	Lysine	15.85	156	301	347	185.9 ± 6.1	897.2 ± 57.3	4.83
23	Histidine	16.35	254	267	356	565.5 ± 9.6	1441.7 ± 238.2	2.55
24	Tryptophan	18.35	130	244	333	156.8 ± 3.9	520.5 ± 118.1	3.32

¹ The bolded ions were used for quantification. ² Normalized value = amino acid amount of L. chinense/amino acid amount of L. barbarum.