Phenylazothioformamide, the active principle in the fungitoxic action of 1‐phenylthiosemicarbazide

Abstract
SUMMARY: Laboratory trials using Aspergillus niger indicate that the antifungal effect of 1‐phenylthiosemicarbazide is based upon its conversion into an oxidation product, phenylazothioformamide. This conversion takes place much more slowly at pH 5 than at pH 7 and is completely prevented by the reducing agent sodium thioglycollate. Both acidity of the medium and the presence of reducing agents lower the fungitoxicity of 1‐phenylthiosemicarbazide.