title: Synthesis and characterization of poly(methoxyl ethylene glycol-caprolactone-co-methacrylic acid-co-poly(ethylene glycol) methyl ether methacrylate) pH-sensitive hydrogel for delivery of dexamethasone.
abstract: In this work, a novel pH-sensitive hydrogels based on macromonomer of methoxyl poly(ethylene glycol)-poly(caprolactone)-acryloyl chloride (MPEG-PCL-AC, PCE-AC), poly(ethylene glycol) methyl ether methacrylate (MPEGMA), and methacrylic acid (MAA) were successfully synthesized by heat-initiated free radical polymerization method. The obtained macromonomers and hydrogels were characterized by (1)H NMR and FT-IR, respectively. Morphology study, swelling behavior, in vitro drug release behavior, acute oral toxicity of hydrogels, and cytotoxicity of PCE-AC macromonomer were also investigated in this paper. Finally, the hydrogels demonstrated that the sharp change in different pH value, thus believing to be promising the suitability of the candidate for oral drug-delivery systems.
authors.affiliation: State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Wang
authors.forename: Xu
authors.initials: X
authors.lastname: Xu
authors.forename: YuJun
authors.initials: Y
authors.lastname: Wang
authors.forename: Xi
authors.initials: X
authors.lastname: Yan
authors.forename: Gang
authors.initials: G
authors.lastname: Guo
authors.forename: MeiJuan
authors.initials: M
authors.lastname: Huang
authors.forename: Feng
authors.initials: F
authors.lastname: Luo
authors.forename: Xia
authors.initials: X
authors.lastname: Zhao
authors.forename: YuQuan
authors.initials: Y
authors.lastname: Wei
authors.forename: ZhiYong
authors.initials: Z
authors.lastname: Qian
mesh_terms: D000818:Animals; D002626:Chemistry, Pharmaceutical / Q000379:methods; D003907:Dexamethasone / Q000008:administration & dosage* / Q000009:adverse effects; D004337:Drug Carriers / Q000737:chemistry*; D005260:Female; D005938:Glucocorticoids / Q000008:administration & dosage* / Q000009:adverse effects; D020100:Hydrogels; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008689:Methacrylates / Q000737:chemistry; D051379:Mice; D008807:Mice, Inbred BALB C; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D023382:Toxicity Tests, Acute
chemical_list: D004337:Drug Carriers; D005938:Glucocorticoids; D020100:Hydrogels; D008689:Methacrylates; D011108:Polymers; D011092:Polyethylene Glycols; D003907:Dexamethasone