Table 2.

Regression equation, R², linear range, LOD and LOQ of 18 amino acids.

Analyte	Regression equation	R2	Linear range (μg/mL)	LOD (μg/mL)	LOQ (μg/mL)
Asp	y=14.831x+0.133	0.9991	1.23–1.08×101	0.31	0.94
Ser	y=21.547x+0.293	0.9976	3.05–1.04×102	0.25	1.03
Glu	y=14.622x+0.218	0.9995	2.53–1.50×101	0.32	1.04
Gly	y=29.244x+0.167	0.9992	1.02–1.10×101	0.27	0.82
His	y=12.107x+0.042	0.9993	3.25–4.10×101	0.56	1.68
Arg	y=12.836x−0.051	0.9998	0.95–9.50	0.19	0.53
Thr	y=21.929x+0.030	0.9998	0.85–7.50×101	0.23	0.67
Ala	y=27.332x+0.2070	0.9994	0.45–1.05×102	0.11	0.32
Pro	y=19.77x+0.038	0.9999	4.05×101−3.00×102	0.46	1.38
Cys	y=9.189x+0.067	0.9999	0.55–1.05×102	0.12	0.34
Tyr	y=12.337x+0.035	0.9991	2.03–1.25×102	0.31	0.93
Val	y=20.83x+0.052	0.9999	1.03–2.01×101	0.27	0.82
Met	y=17.23x−0.004	0.9999	0.52–1.50×102	0.14	0.43
Lys	y=26.342x+0.229	0.9976	0.85–2.34×101	0.21	0.63
Ile	y=19.259x+0.066	0.9999	0.95–1.54×101	0.24	0.71
Leu	y=19.771x+0.018	0.9999	0.82–1.34×101	0.21	0.62
Phe	y=17.125x+0.023	0.9998	0.93–7.04×102	0.16	0.47
Trp	y=12.186x+0.044	0.9998	2.34–4.54×101	0.48	1.43