Depolymerization of chitin and chitosan in the course of base deacetylation

Physiochemical Properties of Caulobacter crescentus Holdfast: A Localized Bacterial Adhesive

“…In contrast, the effects of basic pH were irreversible (Figure 5D). Since the drop of affinity at basic pH occurs for both holdfast and PGA on both surfaces and is irreversible (Figure 5D) we hypothesize that the decrease in affinity at basic pH may involve degradation of the N -acetylglucosamine matrix, likely through base hydrolysis 40 .…”

Synthesis of high molecular weight chitosan from chitin by mechanochemistry and aging

“…We thus explored the use of aging, in dry and humid environments since it has been hypothesized that water plays a large role in depolymerization by activating the glycosidic bond for nucleophilic attack in a basic environment. 69 Humidity levels in the samples during aging were monitored thanks to controlled humidity chambers. Salt saturated aqueous solution prepared with K2CO3, NaCl, and K2SO4 were able to afford stable 43, 75, and 98% relative humidity (RH) environments inside a sealed enclosure, respectively.…”

Manufacture and performance of ethylamine hydroxyethyl chitosan/cellulose fiber in N -methylmorpholine- N -oxide system

“…Peak at 1022 cm À1 was assigned to the stretching vibration of secondary amine group, illuminating that amination reacted at -NH 2 simultaneously. Due to the introducing of numerous -NH 2 , compared with HEC, the peaks at 1618 cm À1 (N-H bend) and 3428 cm À1 (N-H stretch) were enhanced [26].…”