Co-Innovation Center for Efficient Processing and Utilization of Forest Products, College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, PR China.
Co-Innovation Center for Efficient Processing and Utilization of Forest Products, College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, PR China.
Int J Biol Macromol. 2022 Jun 15;210:716-741. doi: 10.1016/j.ijbiomac.2022.04.228. Epub 2022 May 6.
Lignin, a biopolymer obtained from agricultural/forestry residues or paper pulping wastewater, is rich in aromatic structure, which is central to its adoption as a candidate to natural antioxidants. Through insight into its structural features from biomass, different functional groups would influence lignin antioxidant activity, wherein phenolic content is the most important factor, hence massive studies have focused on its improvement via different pretreatments and post-processing methods. Besides, lignin nanoparticles and chemical modifications are also efficient methods to improve antioxidant activity via increasing free content and decreasing bond dissociation enthalpy of phenolic hydroxyl. Lignin samples exhibit comparable radicals scavenging ability to commercial ones, showing their potential as renewable alternatives of synthesized antioxidants. Besides, their applications have also been discussed, which demonstrates lignin potential as an inexpensive antioxidant additive and consequent improvements on multiple functionalities. This review is dedicated to summarize lignin antioxidants extracted from biomass resources, methods to improve their antioxidant activity and their applications, which is beneficial for realizing lignin valorization.
木质素是一种从农业/林业残余物或造纸制浆废水中获得的生物聚合物，富含芳香结构，这使其成为天然抗氧化剂的候选物质。通过深入了解生物质中的结构特征，不同的功能基团会影响木质素的抗氧化活性，其中酚类含量是最重要的因素，因此大量研究集中在通过不同的预处理和后处理方法来提高其抗氧化活性。此外，木质素纳米粒子和化学修饰也是通过增加游离含量和降低酚羟基的键离解焓来提高抗氧化活性的有效方法。木质素样品表现出与商业样品相当的自由基清除能力，表明它们作为合成抗氧化剂的可再生替代品具有潜力。此外，还讨论了它们的应用，这表明木质素作为一种廉价的抗氧化添加剂具有潜力，并能提高多种功能。本文综述了从生物质资源中提取的木质素抗氧化剂、提高其抗氧化活性的方法及其应用，这有利于实现木质素的增值。
