title: The stability and controlled release of I-ascorbic acid encapsulated in poly (ethyl-2-cyanoacrylate) nanocapsules prepared by interfacial polymerization of water-in-oil microemulsions.
abstract: The L-ascorbic acid (AA) was encapsulated into biodegradable and biocompatible poly(ethyl-2-cyanoacrylate) (PECA) nanocapsules by interfacial polymerization of water-in-oil (W/O) microemulsions. The influences of surfactant concentration, pH value of the dispersed aqueous phase, and W/O ratio on nanocapsule size were discussed. The stability and in vitro release of encapsulated AA were also investigated. The results show that nanocapsules could be obtained under the conditions with low pH value, high fraction of aqueous phase, and appropriate surfactant concentration. The encapsulated AA was protected by nanocapsules from oxidation and presented superior storage stability in aqueous medium than pure AA. Releasing AA from the inner core of nanocapsules could be controlled by adjusting the enzyme hydrolysis extent of the PECA wall.
authors.forename: Su-Ning
authors.initials: SN
authors.lastname: Zhang
authors.forename: Tao
authors.initials: T
authors.lastname: Chen
authors.forename: Yi-Guang
authors.initials: YG
authors.lastname: Guo
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Xiaoqiu
authors.initials: X
authors.lastname: Song
authors.forename: Lei
authors.initials: L
authors.lastname: Zhou
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry*; D003358:Cosmetics / Q000737:chemistry; D003487:Cyanoacrylates / Q000737:chemistry*; D065546:Drug Liberation; D004655:Emulsions / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D053769:Nanocapsules / Q000737:chemistry*; D058105:Polymerization
chemical_list: D003358:Cosmetics; D003487:Cyanoacrylates; D004655:Emulsions; D053769:Nanocapsules; C558475:poly(ethylcyanoacrylate); D001205:Ascorbic Acid