title: Inclusion complex of beta-chitin and aliphatic amines.
abstract: Inclusion complexation of beta-chitin with linear aliphatic amines was studied by X-ray diffraction. All tested amines, C3 to C8 monoamines and C2 to C7 diamines with terminal amino groups, reversibly formed crystalline complexes with beta-chitin by immersion of dry chitin in pure liquid. Complex formation caused linear increase in the 010 sheet spacing of beta-chitin depending on the carbon number of amine. The complexes could be classified as type I and type II according to the increment of sheet spacing against carbon number. All monoamines formed type II complexes. In dry conditions, diamine formed a type I complex though the type of diamine complex differed for guest species in wet conditions. Based on the unit cell dimension and thermogravimetry, type II and type I are likely to correspond to guest-host (amine-chitobiose) ratios of 2:1 and 1:1, respectively. These differences seem to arise from varied interactions between functional groups of chitin and amines.
authors.affiliation: Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan. noishiki@sbp.fp.a.u-tokyo.ac.jp
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Noishiki
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Nishiyama
authors.forename: Masahisa
authors.initials: M
authors.lastname: Wada
authors.forename: Shigeru
authors.initials: S
authors.lastname: Okada
authors.forename: Shigenori
authors.initials: S
authors.lastname: Kuga
mesh_terms: D000588:Amines / Q000737:chemistry*; D001704:Biopolymers / Q000737:chemistry*; D002686:Chitin / Q000737:chemistry*; D008958:Models, Molecular; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D000588:Amines; D001704:Biopolymers; D002686:Chitin