Conversion of lignocellulosic waste by white-rot fungi into ruminant animal feed: Assessment of white-rot for selective lignin degradation
1998
Apetorgbor, M. | Darkwa, N. A. | Ofosu-Asiedu, A.
Lignin, the three-dimensional network polymer in wood inhibits its use as feed for ruminants. In order therefore to use wood waste as a source material for ruminants, the lignin has to be modified or degraded. This can be done with certain fungi. In this study, thirty-three wood decaying fungi were screened for their ability to selectively delignify wawa (Triplochiton scleroxylon K. Schum) wood. Observation of coloured zone of certain phenoloxidase reagents, the amount of lignin loss and the holocellulose content were the major criteria used to determine the fungi with superior lignin degradation while the remaining eight were brown-rot fungi. Three of these white-rot fungi (FPG 192, 209 and 217) degraded wawa wood lignin extensively (over 40% of the klason lignin) and their lignin degradation was very selective. Ligninolytic activity of most of the selected strains of fungi were however similar to that of a typical lignin degrading fungus, Trametes versicolor, (Fr) Quel.
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