X-Ray diffraction study of sulfuric, nitric, and halogen acid salts of chitosan

✍ Scribed by Kozo Ogawa; Saeko Inukai

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 492 KB
• Volume: 160
• Category: Article
• ISSN: 0008-6215
• DOI: 10.1016/0008-6215(87)80328-2

✦ Synopsis

Chitosan {poly-[(1--*4)-p-D-glucosamine]}, the deacetylation product of chitin, is considered to be a promising bioresource, because, unlike chitin, it is The resulting salts were studied by X-ray fiber diffraction ; salts formed with HNO 3 , HBr, and HI each gave a distinct pattern that suggested retention of the two-fold, helical conformation of untreated chitosan . Patterns of salts prepared with HF, HCI, and H2SO4 differed substantially, showing helical repeats of 40 .73 A .

Stereochemical analysis suggests that the last 3 salts form either left-or righthanded helices that have 8 residues in 3 turns . These 3 salts have identical unit-cell dimensions, despite differing anion sizes.