Abstract:

In order to offer an applicating basic theory study to biopulping with David Poplar wood, and decrease environment pollution in paper industry and make full use of lignin resources, this study selected Phellinus igniarius and 5 wood-rotting fungi with higher wood degrading ability living on broad-leaf trees, I.e. Funalia gallica, Pseudotrametes gibbosa, Lenzites tricolor, Polyporellus brumalis and Pycnoporus sanguineus, FTIR spectrometer was used to measure infrared spectrograms of primitive wood sample and wood samples degraded by 6 species of fungi on 120 d respectively, a little powders shaved from the very surface of primitive wood sample and wood samples degraded by 6 species of fungi on 120 d were put into KBr powder and milled under dryness condition, then pressed to slices and put FTIR to measure infrared spectrograms, libration changes of peak location and relative absorption intensity of primitive wood sample and wood samples degraded by 6 species of fungi on 120 d were gained, then the changes of function groups of wood and lignin after rotted were analysed in order to get more study on wood biodegradation. Results showed the function groups of wood and lignin were all degraded in different degree. Although aromatic rings were not changed very much, side chains of lignin such as carbonyl groups, CH2, syringic units and guaiacyl units were partly degraded. The extents of lignin degraded by 6 species of wood white-rot fungi were different in the view of peak absorption intensity change, P. sanguineus, P. brumalis, L. tricolor and P. gibbosa had higher ability than F. gallica and P. igniarius in lignin degrading.

Key words: wood white-rot fungi, lignin function group, FTIR analysis