Ionic liquid-mediated regeneration of cellulose dramatically improves decrystallization, TEMPO-mediated oxidation and alkyl/alkenyl succinylation

Li, Z., Zhan, G., Charalampopoulos, D. ORCID: https://orcid.org/0000-0003-1269-8402 and Guo, Z. (2023) Ionic liquid-mediated regeneration of cellulose dramatically improves decrystallization, TEMPO-mediated oxidation and alkyl/alkenyl succinylation. International Journal of Biological Macromolecules, 236. 123983. ISSN 0141-8130 doi: 10.1016/j.ijbiomac.2023.123983

Abstract/Summary

This work demonstrated a successful strategy that simple ionic liquids (ILs) mediated pretreatment could effectively reduce crystallinity of cellulose from 71 % to 46 % (by C2MIM.Cl) and 53 % (by C4MIM.Cl). The IL-mediated regeneration of cellulose greatly promoted its reactivity for TEMPO-catalyzed oxidation, which the resulting COO− density (mmol/g) increased from 2.00 for non-IL-treated cellulose to 3.23 (by C2MIM.Cl) and 3.42 (C4MIM.Cl); and degree of oxidation enhanced from 35 % to 59 % and 62 %, respectively. More significantly, the yield of oxidized cellulose increased from 4 % to 45–46 %, by 11-fold. IL-regenerated cellulose can also be directly subjected to alkyl/alkenyl succinylation without TEMPO-mediated oxidation, producing nanoparticles with properties similar to oxidized celluloses (55-74 nm in size, −70–79 mV zeta-potential and 0.23–0.26 PDI); but in a much higher overall yield (87–95 %) than IL-regeneration-coupling-TEMPO-oxidation (34–45 %). Alkyl/alkenyl succinylated TEMPO-oxidized cellulose showed 2–2.5 times higher ABTS* scavenging ability than non-oxidized cellulose; however, alkyl/alkenyl succinylation also resulted in a significant decline in Fe2+ chelating property.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/111181
Identification Number/DOI	10.1016/j.ijbiomac.2023.123983
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
Publisher	Elsevier
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