木质素（碱性）属于一类复杂的有机聚合物。化学上，木质素是交联的酚聚合物。从功能上讲，木质素是维管植物和某些藻类支持组织中结构材料的主要类别之一。木质素在植物细胞壁的形成中尤其重要，尤其是在木材和树皮中，因为木质素具有刚性并且不易腐烂。 应用： 碱性木质素可用作天然纤维与石油基树脂复合材料的表面处理剂。它可用作生物吸附剂，有望用于从废水中去除有毒金属离子。 Lignin (Alkaline) is among a class of complex organic polymers. Chemically,lignins are cross-linked phenol polymers. Functionally, Lignins are one of the main classes of structural materials in the support tissues of vascular plants and some algae. Lignins are particularly important in the formation of plant cell walls, especially in wood and bark, because they lend rigidity and do not rot easily.