Stability of Soluble Dialdehyde Cellulose and the Formation of Hollow Microspheres: Optimization and Characterization

Abstract

The poor solubility of raw cellulose greatly limits its applications. Herein, the periodate oxidation of cellulose was conducted to obtain dialdehyde cellulose (DAC), which is a kind of soluble and configurable cellulosic derivative with great potential applications as a functional material. The oxidation of cellulose included a process of exfoliating the cellulose from its original source, and the particle size was reduced after a prolonged oxidation. The dissolved DAC, solubilized in water by heating, showed an obvious Tyndall phenomenon with a strengthening trend with aging, and the molecular weight decreased sharply at the beginning of aging and then tended to be stable after 3 months. A large change in the freeze-dried DAC solutions with different oxidation degrees, ranging from crystal string beading to hollow microspheres, was explicated by layer peeling during oxidation, while the solution was at a steady state after aging. The special structure of DAC, such as the existence of aldehydes with low molecular weight in solution-based processes and the formation of regular hollow spheres after freeze-drying, enabled it to be used in cosmetics, food, wound dressings, and drug carriers.

Interfacial assembly of self-healing and mechanically stable hydrogels for degradation of organic dyes in water

“…This method can be achieved in three steps. First, Pd NPs are immobilized on the DACO-PDA fibers to form DACO-PDA@Pd NPs rich in hydrophilic groups based on previously reported work [42][43][44] . Second, the phenolic hydroxyls on the DACO-PDA@Pd NPs were converted into semiquinone radicals, and then were oxidized to the corresponding quinone/hydroquinone in the process of converting Pd 2+ into Pd NPs ( Fig.…”

“…authors' group 55 . The bamboo pulp was reformed by mechanical treatment and used as the original cellulose fiber, which has been described in detail in our earlier work 42,43 . Then, adding NaClO 2 to the solution, the mixture was adjusted to pH 5.8 with PBS and stirred for 24 h. Then NaBH 4 was added and stirred for another 1 h to form a uniform emulsion, until no further decrease in pH, and dialyzed against for 2 days.…”

Catalytic Conversion of Biomass‐Derived 2, 5‐Dimethylfuran into Renewable p‐Xylene over SAPO‐34 Catalyst

“…Production of renewable chemicals and materials from biomass has arisen ever‐increasing public concerning due to environmental problems and energy shortages in recent years . pX, derived currently from petroleum‐based feedstock, is a very important platform chemical for its important application on producing terephthalic acid (TPA) and polyethylene terephthalate (PET).…”

Cellulose Fibrils Extracted from Bamboo Chips as a Reinforcing Material for Prolonged Drug Release

“…[16] In this regard, dialdehyde cellulose (DAC) from periodate oxidation serve as the main candidate to further convert into cellulosic polymer with many activate groups. [17][18][19] In pervious reports, polyethylenimine (PEI) with a large number of primary amine and diamine groups can form abundant amide groups within aldehydes matrixes, which could be effectively loaded with many negatively charged drug molecules. [20] Furthermore, 2-(Dimethylamino) ethyl methacrylate (DMAEMA), which is a kind of intelligent polymer with both temperature and pH sensitivity, has been a potential polycationic carrier and can adjust the phase transition at 14 ∼ 50°C with the protonation degree of the side chain tertiary amine group, both in vitro and in vivo.…”