Abstract：
:In this study, aimed at valorization of industrial xylan-rich hemicelluloses (a by-product of dissolving pulp process), water-soluble hemicelluloses were fabricated with mild acetylation in 1-ethyl-3-methylimidazolium acetate ionic liquid (EmimAc) and dichloroacetyl chloride (Cl2AcCl) system by a facile and novel method. The structure of the acetylated hemicelluloses was characterized by FT-IR and NMR spectra. The resultant modified products could fully dissolve in water with the degree of substitution (DS) valued between 0.17 and 0.37. Structural characterization indicated that the modified hemicelluloses were chiefly composed of the (1 → 4)-linked β-D-Xylp backbone with hydroxyl or -COCH3 linked to O-2 and O-3 of the Xylp units. Moreover, the mild acetylation was achieved by one-pot method, in which the hemicelluloses reacted with mixed anhydride produced between EmimAc and Cl2AcCl rather than Cl2AcCl. Rheological behavior measurements revealed that acetylated hemicelluloses solutions showed shear-thinning behavior and indicated lower viscosity compared with those of the referenced hemicelluloses. The excellent water-solubility of industrial hemicelluloses would widen its application field and be easier for its conversion into desired chemicals.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Zhu R,Liu X,Li L,Wang Q,Zhao Q,Liu S,Feng W,Xu F,Zhang Xdoi
10.1016/j.ijbiomac.2020.06.289subject
Has Abstractpub_date
2020-11-15 00:00:00pages
457-463eissn
0141-8130issn
1879-0003pii
S0141-8130(20)33741-7journal_volume
163pub_type
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journal_title：International journal of biological macromolecules
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