Partition-controlled progesterone release from waterborne, in situ-gelling materials

Brent Vernon, Frank Fusaro, Brad Borden, Kelly H. Roy

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The primary goal of this work was to evaluate the long-term constant zero-order release of progesterone from a waterborne, in situ-gelling, injectable material. The motivation for this is to develop an intrafallopian tube embolization system for contraception. Poly(ethylene glycol) diacrylate (PEGDA, 575g/mol) or poly(propylene glycol) diacrylate (PPODA, 540g/mol) as a Michael-type addition acceptor was combined with pentaerythritol-tetrakis (3-mercaptopropionate; a Michael-type addition donor) to create a 75wt.% emulsion solution in 0.1M PBS (pH 7.4 for PEGDA and pH 12 for PPODA) that gels in minutes by the Michael-type reaction to form a hydrophobic solid. Samples, with ∼5.5 or 25wt.% progesterone, were formed in Tygon tubing. Samples (1.6mm × 1.0cm cylinders) showed constant, partition-controlled release of progesterone for a prolonged period (time dependent on the mass of progesterone). Cylinders with ∼25wt.% load of progesterone exhibited constant release (∼40μg per day) for more than 50 days in both the PEGDA and PPODA systems. This type of release is normally associated with preformed hydrophobic matrix systems. In contrast, these in situ-gelling materials reported here can be used to provide zero-order, partition-controlled release of progesterone and enhance the efficiency of an intrafallopian tube embolization system through progesterone release in an injectable, in situ-forming system.

Original languageEnglish (US)
Pages (from-to)191-200
Number of pages10
JournalInternational Journal of Pharmaceutics
Issue number1-2
StatePublished - Apr 15 2004


  • Contraception
  • Controlled release
  • Drug delivery systems
  • In situ-gelling
  • Michael-type addition
  • Progesterone

ASJC Scopus subject areas

  • Pharmaceutical Science


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