31. Lignin is thought to shield associated nutrients from digestion and hence limits degradation.32. Guaiacol is present in wood smoke, resulting from the pyrolysis of lignin . 33. This leaves behind the fibreous parts such as cellulose, lignin and hemicellulose. 34. The by-product of this process is lignin . 35. Dihydroflavonol 4-reductase is an enzyme part of the lignin biosynthesis pathway. 36. The homogeneous lignin polymer may be used as raw materials for other products. 37. Oxidative enzymes such as phenol oxidase and peroxidase mediate lignin degradation and humification. 38. Lignin removal from wood fibres conventionally relies on costly and environmentally hazardous chemicals.39. The fungus degrades the lignin present and increases the digestibility of the cellulose. 40. When lignin breaks down, the wood deteriorates.
