Preparation of chitosan nanofibers from completely deacetylated chitosan powder by a downsizing process

Characterization of Chitosan Nanofiber Sheets for Antifungal Application

“…We prepared chitosan NF using the Star Burst system, which employs high-pressure water-jet technology [ 8 , 9 , 10 ]. Chitin or chitosan dispersed in water were passed through waterjet system equipped with a ball-collision chamber and then slurry was ejected from a small nozzle under high pressure.…”

“…Mechanical treatment did not affect DDA, but M w was decreased ( Table 1 ). It was reported that a large number of passes causes depolymerization [ 9 , 10 ]. Interestingly, the surfaces of the chitosan NFs and SDCNF were positively charged, even though these were prepared under neutral conditions.…”

“…Moreover, SDCNF, whose surface was chitosan and whose core part was maintained as chitin crystal, showed the best mechanical properties. Chitosan NF and SDCNF showed low thermal expansion and high density [ 9 , 10 , 12 ]. These results indicate that the mechanical properties of chitosan were improved by nanofibrillation.…”

“…The sample was passed through a grinder (MKCA6–3; Masuko Sangyo Co., Kawaguchi, Japan) once at 1500 rpm and then passed through a high-pressure water-jet system as described above. Chitosan NFs were prepared as described previously [ 9 , 10 ].…”

“…Due to its biocompatibility and biodegradability, chitosan has great potential in various fields, and thus chemical and structural modifications have been made to widen its applicability [ 2 , 3 , 4 , 5 , 6 , 7 ]. We recently developed chitosan nanofiber (NF) and chitin NF (CNF) using the Star Burst system, which employs high-pressure water-jet technology [ 8 , 9 , 10 ]. NF has a highly uniform structure of 10–20 nm diameters and shows high dispersibility in water due to its submicron size and high surface-to-volume ratio [ 11 ].…”