Table 4 Effect of pH on recovery of alkaloids (%) for 100 mL of water spiked with alkaloids (100 μg/L) loaded on MCX SPE cartridge (150 mg)
Alkaloids | pH of loading solution | ||||
|---|---|---|---|---|---|
3 | 5 | 7 | 8.5 | 10 | |
Angustifoline | 89 | 63 | 45 | 41 | 34 |
Cytisine | 94 | 81 | 60 | 50 | 45 |
Gramine | 97 | 86 | 72 | 73 | 79 |
Hydroxylupanine | 96 | 79 | 66 | 37 | 34 |
Lupanine | 96 | 86 | 61 | 46 | 30 |
Lupinine | 92 | 62 | 49 | 42 | 44 |
Matrine | 96 | 89 | 71 | 56 | 50 |
Sparteine | 89 | 74 | 69 | 44 | 47 |