Comparison of sequential drug release in vitro and in vivo

Sharath C. Sundararaj, Mohanad Al-Sabbagh, Cheryl L. Rabek, Thomas D. Dziubla, Mark V. Thomas, David A. Puleo

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Development of drug-delivery devices typically involves characterizing in vitro release performance with the inherent assumption that this will closely approximate in vivo performance. Yet, as delivery devices become more complex, for instance with a sequential drug release pattern, it is important to confirm that in vivo properties correlate with the expected “programming” achieved in vitro. In this work, a systematic comparison between in vitro and in vivo biomaterial erosion and sequential release was performed for a multilayered association polymer system comprising cellulose acetate phthalate and Pluronic F-127. After assessing the materials during incubation in phosphate-buffered saline, devices were implanted supracalvarially in rats. Devices with two different doses and with different erosion rates were harvested at increasing times post-implantation, and the in vivo thickness loss, mass loss, and the drug release profiles were compared with their in vitro counterparts. The sequential release of four different drugs observed in vitro was successfully translated to in vivo conditions. Results suggest, however, that the total erosion time of the devices was longer and that release rates of the four drugs were different, with drugs initially released more quickly and then more slowly in vivo. Many comparative studies of in vitro and in vivo drug release from biodegradable polymers involved a single drug, whereas this research demonstrated that sequential release of four drugs can be maintained following implantation.

Original languageEnglish
Pages (from-to)1302-1310
Number of pages9
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Issue number7
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© 2015 Wiley Periodicals, Inc.


  • Pluronic F-127
  • cellulose acetate phthalate
  • in vitro drug release
  • in vivo drug release
  • sequential drug delivery

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering


Dive into the research topics of 'Comparison of sequential drug release in vitro and in vivo'. Together they form a unique fingerprint.

Cite this