title: Modification of wheat straw lignin by solid state fermentation with white-rot fungi.
abstract: The potential of crude enzyme extracts, obtained from solid state cultivation of four white-rot fungi (Trametes versicolor, Bjerkandera adusta, Ganoderma applanatum and Phlebia rufa), was exploited to modify wheat straw cell wall. At different fermentation times, manganese-dependent peroxidase (MnP), lignin peroxidase (LiP), laccase, carboxymethylcellulase (CMCase), avicelase, xylanase and feruloyl esterase activities were screened and the content of lignin as well as hydroxycinnamic acids in fermented straw were determined. All fungi secreted feruloyl esterase while LiP was only detected in crude extracts from B. adusta. Since no significant differences (P>0.05) were observed in remaining lignin content of fermented straw, LiP activity was not a limiting factor of enzymatic lignin removal process. The levels of esterified hydroxycinnamic acids degradation were considerably higher than previous reports with lignocellulosic biomass. The data show that P. rufa, may be considered for more specific studies as higher ferulic and p-coumaric acids degradation was observed for earlier incubation times.
authors.affiliation: CECAV-Universidade de Trás-os-Montes e Alto Douro, Department of Animal Science, Vila Real, Portugal.
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Dinis
authors.forename: Rui M F
authors.initials: RM
authors.lastname: Bezerra
authors.forename: Fernando
authors.initials: F
authors.lastname: Nunes
authors.forename: Albino A
authors.initials: AA
authors.lastname: Dias
authors.forename: Cristina V
authors.initials: CV
authors.lastname: Guedes
authors.forename: Luís M M
authors.initials: LM
authors.lastname: Ferreira
authors.forename: John W
authors.initials: JW
authors.lastname: Cone
authors.forename: Guilhermina S M
authors.initials: GS
authors.lastname: Marques
authors.forename: Ana R N
authors.initials: AR
authors.lastname: Barros
authors.forename: Miguel A M
authors.initials: MA
authors.lastname: Rodrigues
mesh_terms: D001487:Basidiomycota / Q000201:enzymology / Q000378:metabolism*; D003373:Coumaric Acids / Q000378:metabolism; D004950:Esterases / Q000378:metabolism; D004951:Esterification; D005285:Fermentation; D006868:Hydrolysis; D008031:Lignin / Q000378:metabolism*; D010636:Phenols / Q000032:analysis; D013997:Time Factors; D014908:Triticum / Q000378:metabolism*
chemical_list: D003373:Coumaric Acids; D010636:Phenols; D008031:Lignin; D004950:Esterases