title: Partially quarternized amino functional poly(methacrylate) terpolymers: versatile drug permeability modifiers.
abstract: Partially quarternized poly(methacrylate) terpolymers (Q-BBMCs) have been synthesized, based on the basic butylated methacrylate copolymer (BBMC/EUDRAGIT E), an excipient approved by the Food and Drug Administration (FDA) and to date mainly applied for tablet coatings. Via straightforward polymer modification reactions, a series of Q-BBMCs with quarternization degrees of 22%, 42%, and 65% has been prepared. Apical to basolateral transport across Caco-2 cell monolayers was investigated, employing the paracellular transported compounds trospium and mannitol. At pH 6.5 quarternization resulted in increased permeation enhancement up to 2.8-fold compared to BBMC, that is, up to 7.3-fold compared to control. Moreover, measurements of the transepithelial electrical resistance (TEER) revealed a special advantage of the quarternized poly(methacrylate) terpolymers with respect to the pH range, in which the polymers exhibit biological activity as permeation enhancers. Whereas at pH 6.5 TEER dropped within 30 min below 30% of the initial value for all polymers, at pH 7.4 this effect solely occurred for Q-BBMCs, meaning a significant extension of the pH range relevant for drug permeation. In a subsequent period of 6 h, also excellent recovery was observed.
authors.affiliation: Institute of Organic Chemistry, Organic and Macromolecular Chemistry, Johannes Gutenberg-Universität Mainz, Mainz, Germany.
authors.forename: Boris
authors.initials: B
authors.lastname: Obermeier
authors.forename: Peter
authors.initials: P
authors.lastname: Langguth
authors.forename: Holger
authors.initials: H
authors.lastname: Frey
mesh_terms: D018938:Caco-2 Cells; D016503:Drug Delivery Systems; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D010539:Permeability; D011109:Polymethacrylic Acids / Q000138:chemical synthesis / Q000737:chemistry* / Q000493:pharmacokinetics; D013607:Tablets / Q000138:chemical synthesis / Q000737:chemistry / Q000493:pharmacokinetics; D014018:Tissue Distribution
chemical_list: D011109:Polymethacrylic Acids; D013607:Tablets; C068872:polybutyl methacrylate