High-efficiency separation of hemicellulose from bamboo by one-step freeze–thaw-assisted alkali treatment. (October 2022)

• Record Type: Journal Article
• Authors: Zeng, Fanyan; Wang, Shanshan; Liang, Jiarui; Cao, Liming; Liu, Xiaoxu; Qin, Chengrong; Liang, Chen; Si, Chuanling; Yu, Zebin; Yao, Shuangquan
• Is Part Of: Bioresource technology. Volume 361(2022)
• Publication Date: 2022-10
• Subjects: Hemicellulose -- Alkali extraction -- Freeze-thawing -- Separation -- Extraction; 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.2022.127735
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Bamboo hemicellulose was separated by one-step freeze–thaw assisted alkali treatment. Separation yield of hemicellulose increased from 64.00% to 73.26%. Extraction yield of hemicellulose increased from 89.58% to 95.73%. The breakage of xylan backbone and arabinose branch chain in hemicellulose was inhibited. Abstract: The selectivity of alkali treatment (AT) for hemicellulose separation is reduced due to the alkali solubility of lignin. It was improved using freeze–thaw-assisted alkaline treatment (FT/AT). In this study, bamboo hemicellulose was separated via a one-step freeze–thaw-assisted alkali treatment (OFT/AT). The effects of freezing temperature, freezing time, alkali concentration, and treatment time on bamboo components were studied. The separation yield of hemicellulose was 73.26%, compared to 64.00% using conventional FT/AT. The separation of lignin and cellulose was inhibited as alkali concentration decreased from 7.0% to 5.0%. The extraction yield of hemicellulose increased from 46.35% to 56.12%. Structural analysis of extracted hemicellulose revealed the effective inhibition of the breakage of the xylose backbone and arabinose side chain of hemicellulose. This indicated that the molecular structure of extracted hemicellulose was relatively complete. It provides theoretical support for the efficient separation of hemicellulose by AT.