Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 180, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2022.114704
Keywords
Corncob; Alkali-oxidation pretreatment; Hemicellulose; Mechanocatalytic depolymerization; Xylooligosaccharides
Categories
Funding
- National Key Research and Development Program of China [2019YFD1101202]
- Jiangsu Province Natural Science Foundation for Distinguished Young Scholars [BK20190035]
- Jiangsu Prov-ince Natural Science Foundation for Young Scholars [SBK2021040275]
- Program of National Natural Science Foundation of China [22178170, 21878142, 22008119, 21908205]
- Six Talent Peaks Project in Jiangsu Province [SWYY-045]
- Key Research and Development Plan of Jiangsu Province [BE2020712]
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Mechanocatalytic depolymerization of hemicellulose from corncob was achieved through a weak alkali-oxidation pretreatment. The study systematically investigated the effects of impregnation solvent, acid catalyst type and dosage, and ball-milling time on the depolymerization process. A mathematical model based on Kamlet-Taft parameters was proposed to explain the relationship between reaction conversion and solvent properties. The optimal conditions resulted in high conversion of hemicellulose to xylooligosaccharides.
Mechanocatalytic depolymerization of lignocellulose constitutes a new frontier in biorefinery. In this study, a weak alkali-oxidation pretreatment with sodium percarbonate was employed to isolate hemicellulose from corncob, which was comprehensively characterized by FTIR, H-1, C-13, and 2D HSQC NMR. The influences of impregnation solvent, the type and dosage of acid catalyst, and ball-milling time on the mechanocatalytic depolymerization of hemicellulose have been systematically investigated. A mathematical model based on Kamlet-Taft parameters was first proposed to reveal the relationship between the reaction conversion and the solvent properties, and the results suggested a solvent possessing a high polarity/polarizability and Lewis basicity is favorable for the reaction. Under the optimal conditions, 97.1% conversion of hemicellulose with 93.1% selectivity of xylooligosaccharides based on xylans could be achieved within 2 h. Qualitative high-resolution ESIMS and quantitative HPAEC analysis demonstrated the good solubility of the obtained xylooligosaccharides was ascribed to the depolymerization of hemicellulose rather than the formation of sulfonated oligosaccharides.
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