Enhancement of oral bioavailability of poorly water-soluble drugs by poly(ethylene glycol)-block-poly(alkyl acrylate-co-methacrylic acid) self-assemblies

J Control Release. 2005 May 18;104(2):289-300. doi: 10.1016/j.jconrel.2005.02.010. Epub 2005 Apr 7.

Abstract

The purpose of the present study was to determine whether pH-sensitive polymeric micelles could improve the oral bioavailability of a poorly water-soluble drug. Poly(ethylene glycol)-block-poly(alkyl acrylate-co-methacrylic acid)s were synthesized by atom transfer radical polymerization and the composition of the ionizable polymer block was varied to maximize drug loading and pH-dependent release. Poorly water-soluble model drugs viz. fenofibrate (FNB) and progesterone (PRG) were incorporated in the self-assemblies by the oil-in-water emulsion or film casting methods. The pH-dependent release of several formulations was studied in vitro and the oral bioavailabilities of FNB-loaded micelles, Lipidil Micro and FNB coarse suspension were assessed in Sprague-Dawley rats at a dose of 7.5 mg/kg. Entrapment efficiency (defined as the ratio of experimental drug loading in self-assemblies to the initial amount of drug added) ranged between 55-75% and was dependent on polymer composition and drug-loading method. Hydrophobic chain composition of the polymer had tremendous impact on in vitro release kinetics, with only poly(ethylene glycol)-block-poly(n-butyl acrylate(17)-co-methacrylic acid(17)) micelles showing the desired pH-dependent drug-release profile. The oral bioavailability of FNB from these self-assemblies revealed 156% and 15% increases vs. FNB coarse suspension and Lipidil Micro, respectively. The results suggest that these pH-sensitive self-assemblies have potential for improving the oral bioavailability of poorly water-soluble drugs.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acrylates / administration & dosage
  • Administration, Oral
  • Animals
  • Biological Availability
  • Fenofibrate / administration & dosage*
  • Fenofibrate / chemistry
  • Fenofibrate / pharmacokinetics
  • Hydrogen-Ion Concentration
  • Male
  • Methacrylates / administration & dosage
  • Micelles
  • Polyethylene Glycols / administration & dosage
  • Rats
  • Rats, Sprague-Dawley
  • Solubility

Substances

  • Acrylates
  • Methacrylates
  • Micelles
  • methacrylic acid
  • Polyethylene Glycols
  • Fenofibrate