| Measure out 225 mL of ethanol and add to ninhydrin. |
| In case ethambutol is present, stain the chromatoplate with ninhydrin for its detection. |
| Another common method involves ninhydrin, which works like invisible ink: when you douse paper with it, the chemical brings out any sweat that may have been left by fingertips. |
| Fixed-dose combination products containing also ethambutol would require staining with ninhydrin solution as this drug cannot be detected with UV light of any wavelenght whatsoever. |
| Standards were visualized by ninhydrin reagent and the chromatogram containing phosphorylated proteins was autoradiographed. |
| Total free amino acids in the leaf extracts and in the phloem exudate were analysed with the ninhydrin reagent. |
