Preparation and spectroscopic characterization of methoxy poly(ethylene glycol)-grafted water-soluble chitosan.
The object of this study was to test the solubility of a methoxy poly(ethylene glycol) (MPEG)-grafted chitosan copolymer in organic solvents and aqueous solution. Water-soluble chitosan with low molecular weight (LMWSC) was used in a PEG-graft copolymerization. The MPEG was conjugated to chitosan using 4-dicyclohexylcarbodimide (DCC), and N-hydroxysuccimide (NHS). Introduction of PEG was confirmed by (1)H and (13)C NMR spectroscopy and FT-IR spectroscopy. The degree of substitution (DS) of MPEG into chitosan was calculated from (1)H NMR data and also by estimating the molecular weight (MW) using gel permeation chromatography (GPC). The DS values obtained from (1)H NMR spectroscopy and GPC were similar, indicating that MPEG-grafted LMWSC was synthesized and properly characterized. Furthermore, the introduction of PEG into chitosan increases the solubility in aqueous solutions over a range of pH values (4.0-11.0) and organic solvents such as DMF, DMSO, ethanol, and acetone.
Jeong
Young-Il
YI
BioMedical Polymer Lab., Department of Nano Polymer Science and Engineering, College of Engineering, Sunchon National University, 315, Maegok-dong, Suncheon, Jeonnam 540-742, Republic of Korea.
Kim
Don-Gon
DG
Jang
Mi-Kyeong
MK
Nah
Jaw-Woon
JW
D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D011092:Polyethylene Glycols / Q000737:chemistry*; D012995:Solubility; D012997:Solvents; D013057:Spectrum Analysis; D014867:Water
D012997:Solvents; C118638:glycol-chitosan; D014867:Water; D011092:Polyethylene Glycols; D048271:Chitosan