The average recovery of spiking samples with 15 amino acids (spiking level, 300 μmol L−1).
| Amino acids | Mean recovery (%) (n = 5) | RSD (%) (n = 5) | ||||
|---|---|---|---|---|---|---|
| Oasis HLB | Oasis MCX | Oasis WCX | Oasis HLB | Oasis MCX | Oasis WCX | |
| Arginine | 80 | 89 | 70 | 4.5 | 3.5 | 5.1 |
| Aspartic acid | 82 | 90 | 83 | 3.5 | 2.8 | 4.6 |
| Cysteine | 90 | 98 | 85 | 2.4 | 2.5 | 3.1 |
| Glutamic acid | 71 | 79 | 70 | 4.5 | 3.9 | 3.4 |
| Histidine | 80 | 85 | 78 | 3.7 | 2.8 | 3.1 |
| Isoleucine | 75 | 82 | 73 | 4.6 | 5.7 | 4.1 |
| Leucine | 71 | 80 | 74 | 5.9 | 4.9 | 4.6 |
| Lysine | 85 | 90 | 80 | 7.8 | 4.2 | 5.2 |
| Methionine | 72 | 82 | 71 | 5.7 | 3.7 | 3.9 |
| Phenylalanine | 78 | 82 | 73 | 6.5 | 5.6 | 5.5 |
| Proline | 76 | 80 | 71 | 4.8 | 4.1 | 5.3 |
| Serine | 70 | 86 | 73 | 6.7 | 4.6 | 4.8 |
| Threonine | 76 | 91 | 75 | 5.3 | 3.8 | 3.9 |
| Valine | 88 | 96 | 80 | 2.7 | 1.9 | 2.5 |