title: Synthesis and characterization of carboxymethylated cyclosophoraose, and its inclusion complexation behavior.
abstract: Carboxymethylated cyclosophoraoses (CM-Cys) were synthesized by chemical modification of a family of neutral cyclosophoraoses isolated from Rhizobium leguminosarum biovar trifolii. Structural analyses of the CM-Cys were carried out using NMR and FTIR spectroscopies, and the molecular weight distributions were confirmed with MALDI-TOF mass spectrometry. Based on structural characterization, native cyclosophoraoses were successfully substituted with carboxymethyl groups at the OH-4 and OH-6 of the glucose residues with degrees of substitution (DS) ranging from 0.012 to 0.290. CM-Cys was also used as a host for the inclusion complexation with hydrobenzoin (HB) and N-acetyltryptophan (N-AcTrp) as guest molecules. NMR spectroscopic analyses of the complexes showed that the CM-Cys induced chemical shifts of some protons of the guest molecules upon the complexation. Phase solubility studies of the guest molecules by CM-Cys were performed using HPLC, and the results were compared with those of native cyclosophoraoses. The solubility of HB and N-AcTrp was enhanced by the CM-Cys about 5.1- and 299-fold, respectively.
authors.affiliation: Department of Microbial Engineering and Bio/Molecular Informatics Center, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, South Korea.
authors.forename: Sanghoo
authors.initials: S
authors.lastname: Lee
authors.forename: Heylin
authors.initials: H
authors.lastname: Park
authors.forename: Donghyuk
authors.initials: D
authors.lastname: Seo
authors.forename: Youngjin
authors.initials: Y
authors.lastname: Choi
authors.forename: Seunho
authors.initials: S
authors.lastname: Jung
mesh_terms: D002236:Carbohydrate Conformation; D005936:Glucans / Q000138:chemical synthesis* / Q000737:chemistry* / Q000302:isolation & purification; D002479:Inclusion Bodies / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D016961:Rhizobium leguminosarum / Q000737:chemistry; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D005936:Glucans; C003328:sophorose