title: Synthesis of chitin cycloalkyl ester derivatives and their physical properties.
abstract: A series of acylated chitin derivatives was prepared by reacting chitin in a solution of trifluoroacetic anhydride and each of the cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl carboxylic acids. The degree of O-acyl substitution was in a range of 1.1-1.4 depending upon the nature of the cyclic acid added, as determined by FT-IR analysis. The solubility of the products in the organic solvents of DMF and THF increased with an increase in the cyclic chain length of the carboxylic acid. Thermal gravimetric analysis indicated that the products were stable up to 220 degrees C for chitin cyclopropanoate and cyclobutanoate, and 250 degrees C for chitin cyclopentanoate and cyclohexanoate. The surface morphology of the products by scanning electron microscopic analysis revealed porous and globular surface for chitin cyclobutanoate, cyclopentanoate, and cyclohexanoate, contrast to the dense and smooth organization for the cyclopropanoate.
authors.affiliation: Department of Bionanochemistry, School of Natural Sciences, Wonkwang University, Iksan, Chonbuk 570-749, Republic of Korea.
authors.forename: Lok Ranjan
authors.initials: LR
authors.lastname: Bhatt
authors.forename: Bo Mi
authors.initials: BM
authors.lastname: Kim
authors.forename: Chai Young
authors.initials: CY
authors.lastname: An
authors.forename: Chi chong
authors.initials: Cc
authors.lastname: Lu
authors.forename: Yong Sik
authors.initials: YS
authors.lastname: Chung
authors.forename: Min Gyu
authors.initials: MG
authors.lastname: Soung
authors.forename: Seok Hoon
authors.initials: SH
authors.lastname: Park
authors.forename: Kyu Yun
authors.initials: KY
authors.lastname: Chai
mesh_terms: D000215:Acylation; D002264:Carboxylic Acids / Q000737:chemistry; D002686:Chitin / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D008855:Microscopy, Electron, Scanning; D019906:Nuclear Magnetic Resonance, Biomolecular; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D002264:Carboxylic Acids; D002686:Chitin