Coupling the post-extraction process to remove residual lignin and alter the recalcitrant structures for improving the enzymatic digestibility of acid-pretreated bamboo residues. (August 2019)

• Record Type: Journal Article
• Authors: Huang, Caoxing; Lin, Wenqian; Lai, Chenhuan; Li, Xin; Jin, Yongcan; Yong, Qiang
• Is Part Of: Bioresource technology. Volume 285(2019)
• Publication Date: 2019-08
• Subjects: Bamboo residues -- Post-extraction -- Enzymatic digestibility -- Acid pretreatment -- Delignification; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.121355
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Post-extraction removed the lignin and disrupted inhibitory properties. Urea-extraction can remove 30% of lignin for enhancing the enzymatic hydrolysis. Post-extraction improved enzymatic digestibility of acid-pretreated bamboo. Physicochemical features showed correlations with enzymatic digestibility. Abstract: In this work, a mild and facile post-extraction using different reagents was evaluated to overcome these recalcitrance for improving the enzymatic digestibility of acid-pretreated bamboo residues by removing the lignin and disrupting its inhibitory properties. Results showed that the enzymatic digestibility of acid-pretreated bamboo residues can be improved from 15.4% to 61.4%, 59.7%, and 42.8% by room temperature post-extraction with phosphoric acid, urea, and ethanol, respectively. Several compelling correlations (R 2 > 0.5) were observable between enzymatic digestibility and structural changes, including delignification, reducing of substrate hydrophobicity, altering cellulose crystallinity, and elevations to the residual lignin syringyl-to-guaiacyl (S/G) ratio and functional groups. The results serve as a demonstration of the downstream value that can be gained when coupling a post-extraction process with acid pretreatment of bamboo residues, resulting in greater fermentable sugar production.