Xylo-oligosaccharides and lignin production from Camellia oleifera shell by malic acid hydrolysis at mild conditions. (December 2021)

• Record Type: Journal Article
• Authors: Zhang, Leping; Zhang, Weiwei; Zhang, Fenglun; Jiang, Jianxin
• Is Part Of: Bioresource technology. Volume 341(2021)
• Publication Date: 2021-12
• Subjects: Camellia oleifera shell -- Xylo-oligosaccharide -- Pretreatment -- Milling wood lignin -- Acid-insoluble lignin; 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.2021.125897
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Xylo-oligosaccharides were obtained by malic acid pretreatment under mild conditions. The total XOS yield could be attained 67.75% at 120 ℃. The malic acid pretreatment mainly obtained xylobiose and xylotriose. The thermal stability of lignin was enhanced after malic acid pretreatment. Abstract: Camellia oleifera shell (COS), a by-product of processing woody vegetable oil, is rich in hemicellulose and lignin. In this study, we investigated the effects of acid concentration, pretreatment temperature and reaction time on the concentration and yield of xylo -oligosaccharides (XOS) and the degree of polymerization (DP) distribution of XOS when pretreating COS with malic acid (MA). Under moderate condition (2 M MA, 120 ℃, 30 min), the maximum yield of XOS with DP 2–4 was 48.78% (based on the initial xylan) with low xylose, 5-hydroxymethylfurfural (HMF) and furfural, in which xylobiose (X2 ), xylotriose (X3 ) and xylotraose (X4 ) concentrations were 5.22 g/L, 2.75 g/L and 2.91 g/L, respectively. In addition, acid-insoluble lignin (AIL) in the residue after MA pretreatment and milling wood lignin (MWL) were mainly composed of guaiacyl and syringyl. AIL has higher thermal stability than MWL, which can be the stabilizer for producing flame-resistant materials.