Influence of aromatic compounds on biodegradation of [14C]-labeled xylan and mannan by the white-rot fungus Phlebia radiata

J Ind Microbiol Biotechnol. 2002 Mar;28(3):168-72. doi: 10.1038/sj.jim.7000221.

Abstract

Radiolabeled [14C]arabinoxylan from wheat meal and [14C]galactoglucomannan from red clover meal were prepared by using 14CO2 as a precursor. Twice as much mannan was mineralized than xylan after 14 days of incubation with Phlebia radiata. Low-molecular-weight phenolic compounds structurally related to lignin increased during mineralization of both hemicellulose fractions. Veratryl alcohol increased degradation of arabinoxylan by approximately 28.5%, whereas veratric acid increased it by only 9.0%. Vanillic acid and ferulic acid also stimulated degradation by 16.6% and 34.7%, respectively. Veratryl alcohol and ferulic acid increased degradation of galactoglucomannan by approximately 75%. Veratraldehyde in both cases repressed the degradation process (23.6% arabinoxylan, 43.8% galactoglucomannan). These results indicate that the degradation of hemicelluloses, e.g., xylan and mannan, by P. radiata is enhanced by addition of aromatic compounds.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzaldehydes / pharmacology
  • Biodegradation, Environmental
  • Carbon Radioisotopes
  • Mannans / metabolism*
  • Poaceae / metabolism
  • Polyporales / metabolism*
  • Polysaccharides / metabolism
  • Vanillic Acid / analogs & derivatives*
  • Vanillic Acid / pharmacology
  • Xylans / metabolism*

Substances

  • Benzaldehydes
  • Carbon Radioisotopes
  • Mannans
  • Polysaccharides
  • Xylans
  • veratric acid
  • hemicellulose
  • Vanillic Acid
  • veratraldehyde