High strength films with gas-barrier fabricated from chitin solution dissolved at low temperature

Novel chitin/chitosan-glucan wound dressing: Isolation, characterization, antibacterial activity and wound healing properties

“…The treatment of neat ChCsGC with alkaline solution of NaOH in the presence of urea removed the hydrogen bonds between the functional groups of the complex components (chitin, chitosan and glucan) while and preparation of the ChCsGC in an acid solution generated the chemical interaction between the individual complex chains (Figure 3b-ii). It seems clear that the intermolecular interactions between polysaccharide chains and water were much stronger than between polysaccharides and isopropyl alcohol, acetone, and ethanol, thus, biopolymers self-aggregated more easily in the presence of the relatively hydrophobic isopropyl alcohol than in the water (Ding et al, 2014;Duan et al, 2013;Goussé et al, 2002). Therefore, co-adhesion between ChCsGC fibers prepared in isopropyl alcohol enhanced significantly, leading to a compact chain packing after the hot pressing (Figure 3b-iv).…”

Chitin Nanofiber Transparent Paper for Flexible Green Electronics

“…[44,49] This solvent evaporation-induced self-assembly (EISA) of ChNF is different from other bottom-up ChNF regeneration methods in that the EISA route does not require any coagulation process that indispensably uses antisolvents to recrystallize ChNF. [40][41][42] Figure 2b shows cross-sectional scanning electron microscopy (SEM) images of the ChNF paper, which reveals that the ChNF are oriented horizontally in-plane making up a nonporous as-casted transparent ChNF paper and (f) a plane origami from a ChNF paper (both scale bars = 2 cm). g) A digital photograph of a graphic image depicting 'squid pen chitin-derived flexible green electronics' printed on a ChNF paper using a normal color laser-jet printer (scale bar = 1 cm).…”

“…[36,37] Such a top-down approach is often combined with specific chemical treatments, such as TEMPO-mediated oxidation, to promote the individualization of ChNF. [38,39] Meanwhile, in a bottomup route, Zhang and co-workers recently demonstrated a pure chitin transparent paper fabricated by coagulating ChNF (regeneration) from a chitin solution dissolved in NaOH/urea/ water; [40] for this type of method nonaqueous solvent systems, such as LiCl/DMAc [41] and CaCl 2 /MeOH [42] are also available. Building on these previous efforts, we introduce here a new version of transparent paper made with bottom-up self-assembled ChNF.…”

Poriferan Chitin as a Versatile Template for Extreme Biomimetics

“…Recently, Duan et al [119] proposed a method for preparing high strength chitin films that displayed gas-barrier properties. They successfully created transparent pure chitin films by dissolving chitin in 11 wt% NaOH-4 wt% urea aqueous solvent at low temperature.…”