title: Uptake and release of budesonide from mucoadhesive, pH-sensitive copolymers and their application to nasal delivery.
abstract: Microparticles of novel, bioadhesive graft copolymers of polymethacrylic acid and polyethylene glycol (P(MAA-g-EG)) were prepared. The aims of this study were to investigate the uptake and release kinetics of budesonide from P(MAA-g-EG) in vitro as well as the pharmacokinetics following nasal administration of the polymer contained budesonide. The loading of budesonide into the pH-sensitive polymers was examined using various ethanol solutions. Ethanol was required for drug solubilization but hindered hydrogel swelling at pH 7.2. Maximum loading of the drug in the polymer was obtained using 25% ethanol solutions. The release of budesonide from the polymer swollen in 25% ethanol solutions obeyed classical Fickian release behavior after an initial rapid drug burst. For nasal administration of budesonide-containing P(MAA-g-EG) the plasma concentration of budesonide was kept constant following a peak concentration of the drug approximately 45 min after administration.
authors.affiliation: Department of Pharmaceutics, Hoshi University, 2-4-41 Ebara, Shinagawaku, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Maitani
authors.forename: A M
authors.initials: AM
authors.lastname: Lowman
authors.forename: K
authors.initials: K
authors.lastname: Takayama
authors.forename: N A
authors.initials: NA
authors.lastname: Peppas
authors.forename: T
authors.initials: T
authors.lastname: Nagai
mesh_terms: D000268:Adhesiveness; D000281:Administration, Intranasal; D000818:Animals; D001672:Biocompatible Materials / Q000008:administration & dosage / Q000493:pharmacokinetics; D001993:Bronchodilator Agents / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics*; D019819:Budesonide / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics*; D005782:Gels; D006863:Hydrogen-Ion Concentration; D008297:Male; D009297:Nasal Mucosa / Q000378:metabolism*; D010316:Particle Size; D011092:Polyethylene Glycols / Q000008:administration & dosage / Q000493:pharmacokinetics; D011109:Polymethacrylic Acids / Q000008:administration & dosage / Q000493:pharmacokinetics; D011817:Rabbits; D012996:Solutions
chemical_list: D001672:Biocompatible Materials; D001993:Bronchodilator Agents; D005782:Gels; D011109:Polymethacrylic Acids; D012996:Solutions; D011092:Polyethylene Glycols; D019819:Budesonide