Accuracy of amino acid analysis.

Table 2: Accuracy of amino acid analysis.

Amino acid	Asp	Glu	Ser	His	Gly	Thr	Arg	Ala	Tyr	Val	Met	Trp	Phe	Ise	Leu	Lys
*(m/m%)*	0.438	2.25	0.375	0.162	0.342	0.241	0.322	0.323	0.231	0.343	0.139	0.092	0.373	0.270	0.550	0.103
$\|\bar{X} - A_{c}\|$	0.026	0.058	0.02	0.01	0.014	0.008	0.032	0.019	0.031	0.030	0.018	0.002	0.016	0.013	0.040	0.015
$2 \sqrt{μ_{B}^{2} + μ_{D}^{2}}$	0.042	0.172	0.051	0.027	0.027	0.014	0.054	0.034	0.046	0.030	0.018	0.028	0.028	0.019	0.040	0.036
s	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes

$A_{c}$ : Assigned value of the certified reference material (CRM); $\bar{X}$ : Mean value obtained for the CRM; $μ_{B}^{2}$ : Uncertainty associated with the certified reference value; $μ_{D}^{2}$ : Uncertainty associated with the analytical method for the particular analyte; Acceptance criteria: $|\bar{X} - A_{c}| \leq 2 \sqrt{μ_{B}^{2} + μ_{D}^{2}}$ ; Asp: Aspartic acid; Glu: Glutamic acid; Ser: Serine; His: Histidine; Gly: Glycine; Thr: Threonine; Arg: Arginine; Ala: Alanine; Tyr: Tyrosine; Val: Valine; Met: Methionine; Trp: Tryptophan; Phe: Phenylalanine; Ile: Isoleucine; Leu: Leucine; Lys: Lysine