A strategy for co-extracting hydroxycinnamic acids with hemicellulose, cellulose and lignin from wheat residues in an integrated biorefinery.

Autor: Ceaser R; Chemical Engineering Department, Stellenbosch University, Private Bag X1, Stellenbosch 7602, South Africa., Chimphango AFA; Chemical Engineering Department, Stellenbosch University, Private Bag X1, Stellenbosch 7602, South Africa. Electronic address: achimpha@sun.ac.za.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2024 Dec 18; Vol. 290, pp. 138925. Date of Electronic Publication: 2024 Dec 18.
DOI: 10.1016/j.ijbiomac.2024.138925
Abstrakt: Cross-linkages with polysaccharides and lignin compromise hydroxycinnamic acid yields and purity in integrated biorefineries. A two-stage-alkaline-based process was sequentially optimised in a wheat straw (WS) and wheat bran (WB)-based biorefinery setup for selective co-production of hydroxycinnamic acids (p-Coumaric acid & ferulic acid) with hemicellulose at the mild-alkaline stage (MAS), and with lignin & cellulose-rich residues at severe-alkaline stage (SAS). The optimum MAS biorefining conditions gave hemicellulose, lignin, and hydroxycinnamic acid yields of 35, 60, and 85 % for WS, and 37, 72, and 66 % for WB, respectively. The WS hydroxycinnamic acids contained p-Coumaric acid (64 %) and ferulic acid (29 %), whereas WB's contained ferulic acid (95 %). At the SAS optimum conditions, cellulose and lignin yields were 76 and 60 % for WS ∼ 48 and 62 % for WB, respectively. The cellulose content and crystallinity of MAS WB residues increased by 111 and 100 %, respectively >55 and 14 % for WS. However, the SAS WS and WB residues' cellulose content and crystallinity increases were > 30 % and 10-20 %, respectively. Therefore, sequential optimization enabled selective hydroxycinnamic acid extraction and increased hemicellulose, lignin, and cellulose-rich residue yields. Furthermore, the optimal conditions for WS and WB at the two stages overlapped, allowing potential co-processing in integrated biorefineries.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier B.V.)
Databáze: MEDLINE
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