Table 3.
Amino acid content in spinach, kale, and purslane [10] (Mean mg/100 g ± SD; n = 3), dry weight.
| Amino acids | Spinach | Kale | Purslane |
|---|---|---|---|
| Aspartic acid | 1987 ± 20.82 b | 3017 ± 47.26 c | 1640 ± 0 a |
| * Threonine | 952 ± 10.02 b | 1417 ± 11.55 c | 759 ± 5.51 a |
| Serine | 858 ± 3.51 b | 1247 ± 11.55 c | 756 ± 5.29 a |
| Glutamic acid | 2630 ± 20.00 b | 3747 ± 45.09 c | 2187 ± 11.55 a |
| Proline | 943 ± 13.20 b | 1360 ± 26.46 c | 824 ± 2.08 a |
| Glycine | 1153 ± 5.77 b | 1573 ± 11.55 c | 918 ± 7.55 a |
| Alanine | 1187 ± 5.77 a | 1730 ± 20.00 b | 1213 ± 15.28 a |
| * Valine | 1153 ± 11.55 b | 1727 ± 15.28 c | 976 ± 9.85 a |
| * Isoleucine | 902 ± 12.58 b | 1320 ± 10.00 c | 801 ± 9.17 a |
| * Leucine | 1770 ± 17.32 b | 2593 ± 23.09 c | 1463 ± 5.77 a |
| Tyrosine | 905 ± 11.36 a | 1197 ± 11.55 b | 677 ± 1.73 a |
| * Phenylalanine | 1113 ± 5.77 b | 1663 ± 20.82 c | 853 ± 7.51 a |
| * Lysine | 928 ± 15.00 b | 1813 ± 25.17 c | 978 ± 13.50 a |
| * Histidine | 481 ± 3.21 b | 650 ± 1.73 c | 346 ± 3.21 a |
| Arginine | 1313 ± 101.6 b | 1770 ± 10.00 c | 957 ± 2.00 a |
| Cystine | 266 ± 8.08 b | 295 ± 2.52 c | 290 ± 13.75 a |
| * Methionine | 379 ± 25.11 b | 462 ± 26.23 c | 316 ± 27.68 a |
| Total non-essential amino acids | 11,242 | 15,935 | 9461 |
| Total essential amino acids | 7679 | 11,645 | 6492 |
| Total amino acids | 18,921 | 27,581 | 15,953 |
Note: Values followed by different letters denote significant difference at p < 0.05 for each analyte of spinach, kale, and purslane across rows; those followed by the same letters denote no significant difference. * Indicates essential amino acid.