title: Hydrazones of isoniazid for colorimetric analysis.
abstract: Two sensitive color reactions of isoniazid are described. They are based on the formation of hydrazone Schiff bases when isoniazid is reacted with 4-nitrobenzaldehyde or pyridoxal. Linear curves were obtained with both reagents when absorbance values were plotted against concentrations.
mesh_terms: D001547:Benzaldehydes; D003124:Colorimetry; D006835:Hydrazones / Q000138:chemical synthesis; D007538:Isoniazid / Q000031:analogs & derivatives* / Q000032:analysis; D008722:Methods; D011730:Pyridoxal; D012545:Schiff Bases / Q000138:chemical synthesis
chemical_list: D001547:Benzaldehydes; D006835:Hydrazones; D012545:Schiff Bases; D011730:Pyridoxal; D007538:Isoniazid