The absorbance and fluorescence intensity of the solutions (n = 3) resulting from the reactions between genipin (a) or fluorescamine (b), respectively, with 0.01 mg/ml 2-aminobutanol (AB) solution, 1 mg/mL ethambutol hydrochloride (ETB) solution, and a mixture solution of 0.01 mg/ml AB and 1 mg/mL ETB (AB+ETB).

 
 
  Part of: Thanayutsiri T, Patrojanasophon P, Opanasopit P, Ngawhirunpat T, Rojanarata T (2024) A novel, green and affordable semi-quantitative limit test for 2-aminobutanol impurity in ethambutol hydrochloride bulk and tablets. Pharmacia 71: 1-7. https://doi.org/10.3897/pharmacia.71.e124137