Functional monomers and polymers. LXX. On the adsorption of iodine onto chitosan

Abstract

SUMMARY:The adsorption of bromine onto powdery chitin, chitosan and cellulose was studied in an aqueous bromine-potassium bromide solution at 30°C. Chitosan was found to show an excellent ability of adsorbing bromine as well as iodine. The chitosan film also exhibited high ability of adsorbing bromine both in methanol and in aqueous potassium bromide solutions. ZUSAMMENFASSUNG:Die Adsorption von Brom an pulverisiertem Chitin, Chitosan und an pulverisierter Cellulose wurde in einer wanrigen Brom-Kaliumbromidlosung bei 30 "C untersucht. Chitosan zeigte eine ausgezeichnete Fahigkeit, Brom und Jod zu adsorbieren. Der Chitosanfilm hat die Fahigkeit, Brom in Methanol und in wanriger Kaliumbromidlbsung zu adsorbieren.

Molecular iodine/polymer complexes

“…As revealed by the 13 C NMR spectrum of the I 2 chitosan, the effect of heavy halogen (iodine) on the chemical shifts (δ) of the carbons of the glucosamine residue was not great; only the chemical shifts of C1, C3 and C4 were displaced to lower fields, but not significantly (Δδ≈0.1-0.2 ppm). This finding would suggest that the nitrogen atom was not involved in the binding of iodine as claimed elsewhere [98,99]. Another important facet of this study was that the coloring phenomenon is believed to be related primarily to I 3¯ ions and to the cylindrically shaped assembly of extended chitosan chains including iodine/iodide molecules.…”

Research on the preparation and antibacterial properties of 2‐N‐thiosemicarbazide‐6‐O‐hydroxypropyl chitosan membranes with iodine

“…However, only little attention has been devoted to their adsorption of halogens. By contrast, the broad‐spectrum antibacterial agent‐iodine was cheap and have excellent antibacterial and antiviral effect 23,24 , the iodine was therefore used to combine with CS by some groups in some studies …”

From Chitin to Chitosan

“…This proves that water can permeate into chitin for solvating, which damages the hydrogen bonds between chitin molecules and increases the diffusivity of styrene, so that the reaction becomes easier [96]. This proves that water can permeate into chitin for solvating, which damages the hydrogen bonds between chitin molecules and increases the diffusivity of styrene, so that the reaction becomes easier [96].…”