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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)

From: Natural alkaloids from narrow-leaf and yellow lupins transfer to soil and soil solution in agricultural fields

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