Sphere, honeycomb, regularly spaced droplet and fiber structures of polyion complexes of chitosan and gellan

Preparation and Characterization of Chitosan‐Gellan Hybrid Capsules Formed by Self‐Assembly at an Aqueous Solution Interface

“…[24] In the previous reports, we described the preparative methods and characterization of the chitosan-gellan capsule, [25] including the chemical and mechanical stabilities, and the dyeing and swelling properties. [23] The chitosan-gellan capsule has potential to versatile and practiced applications for closely native or physiological condition.…”

Polyion Complex Fiber and Capsule Formed by Self-Assembly of Chitosan and Poly(α,L-glutamic acid) at Solution Interfaces

“…Chitosan was prepared according to the same method as described in our earlier article, [13] and commercial chitosans (chitosan 10, 100 and 1 000) purchased from Wako Pure Chemical Ind. Japan were also used.…”

“…a) Data from ref. [13] b) From ref. [16] Two disperse dyes (Methyl Yellow and Methyl Red), two basic dyes (Crystal Violet and Methylene Blue), two direct dyes (Congo Red and Tropaeolin OO), an acid mordant dye (Alizalin Yellow), an acid dye (Tropaeolin OOO) and a dye for food (New Coccine) dyed distinctly the capsules.…”

“…Such polysaccharide polyion complexes have been widely studied, [6,7] as well as chitosan [(1e 4)-2-amino-2-deoxy-b-d-glucan] with amino functional groups [8] and gellan [(3)-b-d-glucose-(1,4)-bd-glucuronic acid-(1,4)-b-d-glucose-(1,4)-a-l-rhamnose- (1)] with carboxyl functional groups. [9] During the course of our continuing work on the chitin and chitosan [10 -12] and chitosan and gellan PIC, [13,14] we found that some of the interaction between cationic chitoFull Paper: Different characteristic surface structures such as spherical capsules, regularly spaced droplets and fibers are formed by electrostatic polysaccharide interaction between chitosan and poly(a,l-glutamic acid) via polyion complex (PIC) formation. Spherical droplet-like PIC capsules of varying diameters form in solutions.…”

Spinning Carbon Nanotube-Gel Fibers Using Polyelectrolyte Complexation

“…[1] Withdrawing this film from the interface of gellan gum (GG) and chitosan (CHIT) containing solutions resulted in fiber formation, whereas dropwise addition resulted in the formation of capsules. [2,3] Recently, Stupp and coworkers demonstrated that this principle can be used to self-assemble combination of oppositely charge molecules such as peptide-hyaluronic acid as well as GG-CHIT into hierarchically ordered sacs and membranes consisting of nanofiber bundles. [4] These linear anionic (GG) and cationic (CHIT) polysaccharides are attractive molecules as they are biocompatible and biodegradable.…”