Partially Acetylated Cellulose Dissolved in Aqueous Solution: Physical Properties and Enzymatic Hydrolysis

Abstract

Cellulose acetate is one of the most important cellulose derivatives. The use of ionic liquids in cellulose processing was recently found to act both as a solvent and also as a reagent. A recent study showed that cellulose dissolution in the ionic liquid 1-ethyl-3-methylimidazoliumacetate (EMIMAc) mixed with dichloromethane (DCM) resulted in controlled homogenous cellulose acetylation; yielding water-soluble cellulose acetate (WSCA). This research investigated the properties of cellulose acetate prepared in this manner, in an aqueous solution. The results revealed that WSCA fully dissolves in water, with no significant sign of molecular aggregation. Its conformation in aqueous solution exhibited a very large persistence length, estimated as over 10 nm. The WSCA exhibited surface activity, significantly reducing the surface tension of water. Because of the molecular dissolution of WSCA in water, augmented by its amphiphilicity, aqueous solutions of WSCA exhibited an overwhelmingly high rate of enzymatic hydrolysis.

Recent Advances in Applications of Cellulose Derivatives-Based Composite Membranes with Hydroxyapatite

“…Cellulose acetate is a cellulose ester formed by partial or full acetylation of the free hydroxyl groups in the anhydroglucose unit. Depending on the acetyl content that usually ranges between 29% and 48%, mono-, di-, and triacetate can be differentiated [33]. The ability of facile processing by various techniques and its broad range of applications make cellulose acetate the most commonly synthesized cellulose derivative worldwide, the global production of CA from biomass being projected by Global Industry Analysis to be 751.1 thousand metric tons until 2024 [34].…”

Incorporation of ground mustard seeds in an active packaging film: structural properties and controlled release of allyl isothiocyanate

“…These results were also in line with the elastic modulus of the samples in Table 1. Low solubility is also related poor solubility of cellulose acetate in water and better solubility in organic solvents, such as acetone used in this study to dissolve the biopolymer (Wheatley, 2007; Alfassi et al ., 2019). In addition, the increasing swelling capacity of water molecules of other films with lower ratio of ground mustard seeds (0:5, 0.5:5, and 3:5) might be observed due to the capability of higher cellulose acetate content in holding water molecules.…”

Cellulose acetate scaffold containing hydroxyapatite/graphene oxide nanocomposite by electrospinning for advanced regenerative therapies

“…6,7 Therefore, to enhance the structural and biological characteristics of these scaffolds, the combination of CA with other synthetic or natural nanocomposites has shown an increase in the mechanical, chemical, and biological properties of this biomaterial. 8,9 To achieve positive responses in damaged tissue, improved biomaterials need to demonstrate the ability to modulate the tissue development process. 3,10 Based on this, several nanoparticle incorporation strategies have been used to enhance the mechanical and biological properties, with the objective of providing a suitable environment for tissue nourishment and regeneration.…”

“…However, on its own, CA exhibits low physicochemical properties. 8,9,15 In previous studies, the Hydroxyapatite-Graphene Oxide (HAGO) nanocomposite enabled the development of new bioactive structures with better biological properties than pure Hydroxyapatite (HA). 16,17 Although HA is a bioceramic bioactive material capable of promoting favorable properties for cells, morphology, and crystallinity, it offers low physical properties.…”