title: Effects of conditions for preparing nanoparticles composed of aminoethylcarbamoyl-beta-cyclodextrin and ethylene glycol diglycidyl ether on trap efficiency of a guest molecule.
abstract: Nanoparticles comprising copolymers of aminoethylcarbamoyl-beta-cyclodextrin (AEC-beta-CD) and ethylene glycol diglycidyl ether (EGDGE) are prepared by an interfacial polyaddition reaction in a miniemulsion system. Polymers are formed in a W/O emulsion containing 0.25-10.0% (w/w) water and 5.0% (w/w) surfactant (MO-3S, tetraglycerin monoester, HLB 8.8), where simple particles are predominantly obtained when the water content is 1.0% and 5.0%. Notably, nano-size small particles (diameter: 0.3 microm) are formed under the condition of 5.0% water and 5.0% surfactant, which have the highest beta-CD contents (75.5 wt.%) and the most positive zeta-potential (53.6 mV). The zeta-potential measurement indicates that the obtained particles have positive charge due to protonation of their amino groups below around pH 10. Actually, uptake of 8-anilino-1-naphthalenesulfonic acid (ANS) bearing negative charge (SO(3)(-)) and moderate hydrophobicity depends on the magnitude of zeta-potential of the particles; viz., the particles with zeta-potential of 53.6 mV show the highest efficiency of uptake. The diameter and the beta-CD contents are closely related with the water/surfactant ratio, and the zeta-potentials are dependent on both the diameter and the beta-CD contents. Inclusion of ANS into the CD cavity of EGDGE/AEC-beta-CD particles can be controlled by electrostatic interaction between ANS (negatively charged) and the particle (positively charged). Namely, synergistic effect of cavity-inclusion and electrostatic interaction can dominate the uptake of guest molecules by the particles.
authors.affiliation: Institute for Biological Resources and Functions, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8566, Japan.
authors.forename: Masaru
authors.initials: M
authors.lastname: Eguchi
authors.forename: Yong-Zhong
authors.initials: YZ
authors.lastname: Du
authors.forename: Yoshikatsu
authors.initials: Y
authors.lastname: Ogawa
authors.forename: Tomoko
authors.initials: T
authors.lastname: Okada
authors.forename: Noboru
authors.initials: N
authors.lastname: Yumoto
authors.forename: Masato
authors.initials: M
authors.lastname: Kodaka
mesh_terms: D000817:Anilino Naphthalenesulfonates; D004337:Drug Carriers; D004655:Emulsions; D004853:Epoxy Resins / Q000737:chemistry*; D005456:Fluorescent Dyes; D006863:Hydrogen-Ion Concentration; D049329:Nanostructures; D036103:Nanotechnology; D011108:Polymers / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry; D013678:Technology, Pharmaceutical / Q000379:methods; D014867:Water / Q000737:chemistry; D047392:beta-Cyclodextrins
chemical_list: D000817:Anilino Naphthalenesulfonates; D004337:Drug Carriers; D004655:Emulsions; D004853:Epoxy Resins; D005456:Fluorescent Dyes; D011108:Polymers; D013501:Surface-Active Agents; C514085:aminoethylcarbamoyl-beta-cyclodextrin; D047392:beta-Cyclodextrins; D014867:Water; C035364:Quetol 651; C027132:1-anilino-8-naphthalenesulfonate