The critical role of lignin in lignocellulosic biomass conversion and recent pretreatment strategies: A comprehensive review

Lignin-related factor and its relationships with biomass conversion are reviewed. Roles of lignin in biological conversion process are discussed. Most recent lignin-targeting pretreatment strategies are summarized. Change of lignin properties by diverse pretreatment strategies are compared. Perspectives for future pretreatment in biorefinery process are provided.