In this study, a green and clean integrated process based on microwave-assisted hydrothermal pretreatment (MHTP) and subsequent alkali post-treatment was performed to isolate and characterize water- and alkali-soluble hemicelluloses (SHs and AHs) from Hybrid Pennisetum (HP) as well as to improve the enzymatic digestibility of HP. Meanwhile, part of hemicelluloses was degraded into the value-added xylo-oligosaccharides (XOS) during the MHTP process, which would be applied to the food and pharmaceuticals industries. State-of-the-art analytical techniques (e.g., HPLC, HPAEC, GPC, and 2D-HSQC) were used to investigate the main component streams (SHs, AHs, XOS, and glucose). Results showed that the structural characteristic of SHs and AHs was mainly composed of β-(1→4)-linked xylans. Additionally, the enzymatic digestibility of the cellulose-rich substrate (A) was 92.8%, which was 3.4 times higher than that of raw material (27.4%). In short, the proposed integrated process was considered as a promising biorefinery strategy for both hemicellulose-based products and bioethanol.
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| http://dx.doi.org/10.1016/j.carbpol.2018.10.027 | DOI Listing |
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