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6 pages, 4 figures, 3 tables, 33 references.After solid-state fermentation of wheat straw with five lignocellulose-degrading fungi, lignin was extracted \udand studied by CPMAS 13C NMR.  The increase in the intensity of the signals in the 200-164 ppm range \udis evidence for the oxidative alteration of  lignin.  The lignins degraded by the white-rot fungi Ganoderma australe and Phanerochaete chrysosporium showed a decrease in the amounts of aryl carbons, \udwhereas the intensity of the 33 ppm signal from saturated alkyl structures was strongly increased by \udthe latter fungus.  The cellulolytic Chaetomium uirescens and Trichoderma Zongibrachiatum and the \udligninolytic  Fomes  fomentarius  caused  the selective  decrease  of  some signals assigned  to lignin-carbohydrate complexes.  A low molecular weight fraction  was recovered by adsorption on poly(vinylpyrrolidone).  The C=O signals of this fraction were strongly increased by the ligninolytic species, \udwhereas the accumulation of aromatic compounds was observed after straw degradation  by P. chrysosporium.Financial  support  through  CICYT  Grants  (Spain) \udBI088-185  (Biotechnology)  and  NAT89-0936,  EC \ud(ECLAIR) Contract AGRE-CT90-0047-(SMA), and BMFT \udGrant 0339137 (Germany).Peer reviewe

CPMAS carbon-13 NMR study of lignin preparations from wheat straw transformed by five lignocellulose-degrading fungi