Table 1 Correlations between plasma proteinogenic amino acid concentrations in newborn piglets measured by UPLC and those measured by ¹H NMR and quantified with the R package ASICS.

Alanine

0.91

2.5e−15

Arginine

0.74

1.1e−08

Asparagine

0.59

7.5e−09

Aspartate

Only by NMR

Cysteine

Only by UPLC

Cystine

Only by NMR

Glutamate

0.79

3.3e−15

Glutamine

0.91

2.7e−23

Glycine

0.84

2.2e−11

Histidine

Only by UPLC

Isoleucine

0.58

4.1e−05

Leucine

0.77

7.1e−07

Lysine

Only by UPLC

Methionine

0.72

2.1e−13

Phenylalanine

0.84

1.7e−17

Proline

0.39

0.0213

Serine

0.76

1.4e−18

Threonine

Only by UPLC

Tryptophan

Only by UPLC

Tyrosine

0.89

1.6e−22

Valine

0.82

1.5e−09