title: Structure and self-assembly properties of a new chitosan-based amphiphile.
abstract: A new chitosan-based amphiphile, octanoyl-chitosan-polyethylene glycol monomethyl ether (acylChitoMPEG), has been prepared using both hydrophobic octanoyl and hydrophilic polyethylene glycol monomethyl ether (MPEG) substitutions. The success of synthesis was confirmed by Fourier transform infrared (FT-IR) and (1)H NMR spectroscopy. The synthesized acylChitoMPEG exhibited good solubility in either aqueous solution or common organic solvents such as ethanol, acetone, and CHCl(3). The self-aggregation behavior of acylChitoMPEG in solutions was studied by a combination of pyrene fluorescence technique, dynamic light scattering, atomic force microscopy, and small-angle X-ray scattering (SAXS). The critical aggregation concentration (CAC) and hydrodynamic diameter were found to be 0.066 mg/mL and 24.4 nm, respectively. SAXS results suggested a coiled structure of the triple helical acylChitoMPEG backbone with the hydrophobic moieties hiding in the center of the backbone, and the hydrophilic MPEG chains surrounding the acylChitoMPEG backbone in a random Gaussian chain conformation. Cytotoxicity results showed that acylChitoMPEG exhibited negligible cytotoxicity even at concentrations as high as 1.0 mg/mL. All results implied that acylChitoMPEG has the potential to be used for biological or medical applications.
authors.affiliation: Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, USA.
authors.forename: Yuping
authors.initials: Y
authors.lastname: Huang
authors.forename: Hailong
authors.initials: H
authors.lastname: Yu
authors.forename: Liang
authors.initials: L
authors.lastname: Guo
authors.forename: Qingrong
authors.initials: Q
authors.lastname: Huang
mesh_terms: D002152:Calorimetry, Differential Scanning; D048271:Chitosan / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity; D056945:Hep G2 Cells; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D009682:Magnetic Resonance Spectroscopy; D011092:Polyethylene Glycols / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity; D053838:Scattering, Small Angle; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C553818:octanoylchitosan-polyethylene glycol monomethyl ether; D011092:Polyethylene Glycols; C028210:monomethoxypolyethylene glycol; D048271:Chitosan