Table 3.
Recovery percentages (% ± SD) for atropine (At) and scopolamine (Sc) testing different amounts of thyme spiked with TAs at 0.01 µg/g under SLE * followed by dSPE or SPE, using different amounts of HMS or SBA-15-functionalized mesostructured silicas as sorbents.
| Sample (g) |
Sorbent (mg) |
SBA-15-SO3− | HMS-SO3− | ||||||
|---|---|---|---|---|---|---|---|---|---|
| dSPE a | SPE b | dSPE a | SPE b | ||||||
| At c | Sc d | At c | Sc d | At c | Sc d | At c | Sc d | ||
| 0.5 | 150 | 54 ± 2 | 37 ± 9 | 77 ± 3 | 61 ± 1 | 56 ± 2 | 49 ± 2 | 78 ± 2 | 74 ± 3 |
| 0.25 | 150 | 87 ± 8 | 73 ± 8 | 90 ± 3 | 88 ± 6 | 88 ± 8 | 79 ± 5 | 100 ± 3 | 98 ± 3 |
| 0.25 | 100 | 58 ± 0 | 43 ± 2 | 67 ± 3 | 48 ± 8 | 58 ± 10 | 47 ± 2 | 94 ± 3 | 82 ± 1 |
| 0.25 | 75 | - | - | - | - | - | - | 101 ± 6 | 83 ± 4 |
| 0.25 | 50 | - | - | - | - | - | - | 79 ± 7 | 64 ± 13 |
* SLE (solid–liquid extraction) conditions: 0.25 g thyme + 8 mL acidified water (pH 1.0, HCl), re-extraction with 1 mL of acidified water. a dSPE: dispersive solid phase extraction; for experimental conditions see Figure 3. b SPE: solid phase extraction; for experimental conditions see Figure 3. c At: atropine, recovery ± SD (%). d Sc: scopolamine, recovery ± SD (%)—not analysed.