Abstract

The effect of amino acids and derivatives, Krebs cycle acids and related compounds, fatty acids, and vitamins and related compounds on the toxicity of 8-quinolinol and bis(8-quinolinolato)copper(II) to Aspergillus oryzae (ATCC 1011) was studied. Only aliphatic thiol-containing compounds (cysteine, glutathione, dithioerythritol, and dithiothreitol) and DL-alpha-lipoic acid protected against 8-quinolinol but not its copper(II) bischelate. It is suggested that 8-quinolinol inhibits lipoic acid biosynthesis, and the mode of fungitoxicity of 8-quinolinol is different from that of bis(8-quinolinolato)copper(II).

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