Table 2.
Solvent systems for antimalarial active pharmaceutical ingredients.
| API | Solvent system 1 (S1) | Solvent system 2 (S2) | Spraying reagent | Colour |
|---|---|---|---|---|
| Artesunate | Ethanol:ammonia (100 : 0.5) | Ethanol:toluene:ammonia (70 : 30 : 1.5) | Anisaldehyde/methanol | Purple |
| Artemether | Petrol:ethyl acetate (70 : 30) | Toluene:ethyl acetate (70 : 30) | Anisaldehyde/methanol | Purple |
| Artenimol | Toluene:ethyl acetate (60 : 40) | Toluene:ethyl acetate (70 : 30) | Anisaldehyde/methanol | Purple |
| Quinine | Methanol:ammonia (100 : 1.5) | Ethyl acetate:acetic acid:water (60 : 20 : 20) | I2/KI | Brown |
| Pyrimethamine | Ethyl acetate:methanol:ammonia (80 : 15:5) | Ethyl acetate:acetic acid:water (60 : 20 : 20) | I2/KI | Brown |
| Sulphadoxine | Ethyl acetate:methanol:ammonia (80 : 15:5) | Ethyl acetate:methanol:acetic acid (75 : 25 : 1) | I2/KI | Brown |
| Lumefantrine | Ethyl acetate:acetic acid:toluene (4 : 2 : 18) | Ethyl acetate:acetic acid (10 : 5) | I2/KI | Brown |