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Degradation and oligomerization of syringic acid by distinctive ecological groups of fungi

Abstract

Forty-four terrestrial and aeroaquatic and aquatic fungi, including fifteen species causing white-rot, four species causing brown-rot, and some species causing soft-rot of wood, were tested for their ability to degrade the monomer syringic acid, which is released during decay of angiosperm lignin. None of the white- or brown-rot species caused any detectable degradation of syringic acid under the test conditions; however, six typical white-rot fungi strongly oligomerized syringic acid, both with and without cosubstrate. The main polymerization product was identified as a 1,3-dimethylpyrogallol oligomer by13C-NMR. Other minor metabolic products were methylated and hydroxylated derivatives. Oligomerization depended on the presence of 1 or 2 methoxy groups in ortho position to the hydroxy group of the substrate.

Among the remaining fungi,Exophiala jeanselmei, Fusarium eumartii, andPaecilomyces variotii completely and rapidly degraded syringic acid (5 g/liter) within 48 to 100 hours. A further seven species were able to degrade syringic acid to some extent when glucose was added. Methylated and demethylated metabolic intermediates were identified by GC/MS.

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Bergbauer, M. Degradation and oligomerization of syringic acid by distinctive ecological groups of fungi. Microb Ecol 21, 73–84 (1991). https://doi.org/10.1007/BF02539145

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  • DOI: https://doi.org/10.1007/BF02539145

Keywords

  • Lignin
  • Vanillic Acid
  • Syringic Acid
  • Lignin Model Compound
  • Exophiala