Determination of Free Amino Acids in Three Species of Duckweed (Lemnaceae)

Table 3

Calibration curves, LODs, and LOQs for the 24 compounds.

Number	Compound	Calibration curve	R^2	Linear range (ng/mL)	LOQ (ng/mL)	LOD (ng/mL)
1	Tyr	y = 6534.1x + 6063.4	0.9984	1.16–5780	0.92	0.46
2	Ala	y = 7168.9x + 4932.8	0.9969	5.30–5300	3.71	1.24
3	Glu	y = 12796x + 47334	0.9960	6.41–2564	4.49	1.50
4	Phe	y = 59157 x + 42917	0.9965	0.99–992.0	0.79	0.40
5	His	y = 20263x + 247917	0.9962	5.57–5570	3.90	1.30
6	Ile	y = 70857x + 46587	0.9957	1.07–1074	0.86	0.43
7	Asp	y = 7084.7x + 86152	0.9963	5.43–5430	3.80	1.27
8	Lys	y = 4305.1x + 17648	0.9980	5.53–5530	3.87	1.94
9	Gly	y = 1063.0x + 3407.3	0.9990	0.94–4680	0.75	0.37
10	Val	y = 31972x + 35728	0.9962	1.11–1112	0.89	0.44
11	Cit	y = 8520.8x + 9811.0	0.9980	1.01–5070	0.81	0.41
12	GABA	y = 18495x + 14623	0.9981	1.10–5490	0.88	0.44
13	Cys2	y = 2389.7x + 3146.6	0.9978	1.09–5440	0.87	0.44
14	Pro	y = 51204x + 58539	0.9981	1.02–510.0	0.82	0.41
15	Trp	y = 19030x + 4465.3	0.9977	1.24–2476	0.99	0.50
16	Leu	y = 56715x + 40047	0.9974	1.01–1012	0.81	0.40
17	Arg	y = 11505x + 84828	0.9974	5.96–5960	4.17	1.39
18	Cys	y = 2496.6x + 1017.5	0.9988	1.20–6012	0.96	0.48
19	Hpro	y = 15783x + 3968.1	0.9977	0.95–1892	0.76	0.38
20	Met	y = 8626.4x + 1545.9	0.9984	1.05–5250	0.84	0.42
21	Thr	y = 8807.8x + 19073	0.9957	4.46–4460	3.12	1.56
22	Asn	y = 4939.9x + 22367	0.9967	1.20–5980	0.96	0.48
23	Gln	y = 7733.9x + 8338.4	0.9961	0.93–4650	0.74	0.37
24	Ser	y = 7731.3x + 54859	0.9977	5.09–5090	3.56	1.19