Table 2.
Identification of oxidation products from l-amino acids.
| l-Amino acid | Elution time (min) |
Reaction product | |
|---|---|---|---|
| l-Amino acid | Products (oxidation or monooxygenation) | Molecular mass (product name) | |
| l-Lysine | 8.7 | 3.8 (Oxidation) | 145.1 (6-Amino-2-oxoheanoic acid) |
| 11.5 (Monooxygenation) | 116.1 (5-Aminopentanamide) | ||
| l-Ornithine | 8.5 | 3.1 (Oxidation) | 131.1 (5-Amino-2-oxopentanoic acid) |
| 10.8 (Monooxygenation) | NDa (4-aminobutanamide) | ||
| l-Arginine | 10.8 | 3.7 (Oxidation) | 173.1 (5-Guanidino-2-oxopentanoic acid) |
| 18.7 (Monooxygenation) | 144.1 (4-Guanidinobutanamide) | ||
a
ND, not determine. MS analysis of l-ornithine monooxygenation product was not carried out, because the product was eluted at the same time as 4-aminobutanamide standard by HPLC with a TSKgel SP-2SW column.