Non-thermal plasma was applied as an innovative pretreatment for the delignification of brewery by-products. The influence of different plasma gases (pure air or air/argon), time and solids concentration (7.5, 10 and 12.5%) was evaluated during the delignification tests. The levels of cellulose, hemicellulose and lignin were monitored before and after treatment. The reduction in lignin content was approximately 50% after 5 min using pure air in all tested solids concentrations. Longer pretreatment times (60 min) influenced the removal of hemicellulose (50%) and cellulose (12%), also indicated by morphological changes. After 5 and 60 min of plasma application, the physical-chemical characteristics showed minor changes in its chemical composition, mainly affected by the losses of lignocellulosic compounds. Non-thermal plasma is considered an attractive alternative for the pretreatment of brewery by-products, resulting mainly in removing lignin, assisting in subsequent processes such as the enzymatic hydrolysis of the spent solid.

非热等离子体被用作啤酒副产品脱木素的创新预处理。在脱木素测试期间评估了不同等离子气体（纯空气或空气/氩气）、时间和固体浓度（7.5、10 和 12.5%）的影响。在处理前后监测纤维素、半纤维素和木质素的水平。在所有测试的固体浓度下，使用纯空气 5 分钟后，木质素含量降低了大约 50%。较长的预处理时间 (60 分钟) 影响了半纤维素 (50%) 和纤维素 (12%) 的去除，形态变化也表明了这一点。等离子应用 5 和 60 分钟后，理化特性显示其化学成分发生微小变化，主要受木质纤维素化合物损失的影响。