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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Fate of p-hydroxycinnamates and structural characteristics of residual hemicelluloses and lignin during alkaline-sulfite chemithermomechanical pretreatment of sugarcane bagasse

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Author(s):
Reinoso, Felipe A. M. [1] ; Rencoret, Jorge [2] ; Gutierrez, Ana [2] ; Milagres, Adriane M. F. [1] ; del Rio, Jose C. [2] ; Ferraz, Andre [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Escola Engn Lorena, Dept Biotecnol, BR-12602810 Lorena, SP - Brazil
[2] CSIC, Inst Recursos Nat & Agrobiol Sevilla, Av Reina Mercedes 10, Seville 41012 - Spain
Total Affiliations: 2
Document type: Journal article
Source: BIOTECHNOLOGY FOR BIOFUELS; v. 11, JUN 5 2018.
Web of Science Citations: 3
Abstract

Background: Preparing multiple products from lignocellulosic biomass feedstock enhances the profit and sustainability of future biorefineries. Grasses are suitable feedstocks for biorefineries as they permit a variety of possible by-products due to their particular chemical characteristics and morphology. Elucidating the fate of p-hydroxycinnamates (ferulates-FAs and p-coumarates-pCAs) and major structural components during bioprocessing helps to discriminate the sources of recalcitrance in grasses and paves the way for the recovery of p-hydroxycinnamates, which have multiple applications. To address these subjects, we assessed sugarcane bagasse biorefining under alkaline-sulfite chemithermomechanical (AS-CTM) pretreatment and enzymatic saccharification. Results: The mass balances of the major bagasse components were combined with 2D-NMR structural evaluation of process solids to advance our understanding of sugarcane bagasse changes during biorefining. AS-CTM pretreatment provided a high yield and thoroughly digestible substrates. The pretreated material was depleted in acetyl groups, but retained 62 and 79% of the original lignin and xylan, respectively. Forty percent of the total FAs and pCAs were also retained in pretreated material. After pretreatment and enzymatic hydrolysis, the residual solids contained mostly lignin and ester-linked pCAs, with minor amounts of FAs and non-digested polysaccharides. Saponification of the residual solids, at a higher alkali load, cleaved all the ester linkages in the pCAs; nevertheless, a significant fraction of the pCAs remained attached to the saponified solids, probably to lignin, through 4-0 ether-linkages. Conclusion: AS-CTM pretreatment provided soundly digestible substrates, which retain substantial amounts of xylans and lignin. Acetyl groups were depleted, but 40% of the total FAs and pCAs remained in pretreated material. Ester-linked pCAs detected in pretreated material also resisted to the enzymatic hydrolysis step. Only a more severe saponification reaction cleaved ester linkages of pCAs from residual solids; nevertheless, pCAs remained attached to the core lignin through 4-O ether-linkages, suggesting the occurrence of an alkali-stable fraction of pCAs in sugarcane bagasse. (AU)

FAPESP's process: 14/06923-6 - Sugar cane biomass recalcitrance: basic knowledge related to the cell wall construction, pretreatment and enzymatic digestion, applied for the development of innovative biorefinery models
Grantee:Andre Luis Ferraz
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants