Date of Completion
PLGA, microspheres, IVIVC, Naltrexone, Leuprolide Acetate, Manufacturing processes
Dr. Diane J. Burgess
Dr. Jie Shen
Dr. Stephanie Choi
Dr. Bodhisatva Chaudhuri
Field of Study
Doctor of Philosophy
This work focuses on development of IVIVCs for variety of Q1/Q2 equivalent parenteral PLGA microspheres with different physicochemical and release characteristics to: 1) achieve a comprehensive understanding of impact of minor manufacturing changes on the physicochemical properties of the microspheres and their relationship with in vitro and in vivo performance; 2) establish Level A IVIVCs; and 3) determine whether release characteristic differences between microspheres can affect the development and predictability of IVIVCs for a variety of microsphere drug products.
Naltrexone and leuprolide acetate (LA) were chosen as the small molecule and peptide microsphere model drug product, respectively. Significant differences were observed in the physicochemical properties (such as particle size, porosity, and morphology) and release characteristics (such as rate and duration) of the compositionally equivalent naltrexone and LA microspheres formulations prepared with minor manufacturing changes. In addition, significant differences in the in vitro burst release and the impact of pore diameter/structure on the release rate were observed for the prepared peptide microsphere formulations. An accelerated in vitro release testing method using modified USP apparatus 4 was developed as a quality control tool for naltrexone microspheres.
The in vivo release profiles of microspheres obtained using a rabbit model were deconvoluted using the Loo-Riegelman method, and compared with the respective in vitro release profiles. The in vivo release profiles showed the same rank order as the in vitro release profiles but with overall faster in vivo release rates. In addition, LA microspheres had significantly low in vivo burst release, which is considered to be due to the masking effect of the absorption phase from the intramuscular site, and this was shown to complicate the development of an IVIVC. Despite these challenges, affirmative Level A IVIVCs were successfully developed for both microsphere products.
Moreover, Level A IVIVCs, with the ability to predict various types of burst release were developed for the compositionally equivalent risperidone and LA microspheres. It was observed that IVIVCs developed using formulations with less variation in burst release had better predictability and vice-versa.
This work provides a comprehensive understanding of developing IVIVCs for complex parenteral drug products such as microspheres.
Development of In Vitro-In Vivo Correlation of Q/1Q2 Equivalent Parenteral Microsphere Drug Products
May 12th 2019
B.Pharm, L.M.College of Pharmacy, Gujarat University, India
M.Pharm, Nirma University, India
Ph.D. University of Connecticut
Directed by: Professor Diane J. Burgess
Andhariya, Janki, "Development of In Vitro-In Vivo Correlation of Q/1Q2 Equivalent Parenteral Microsphere Drug Products" (2019). Doctoral Dissertations. 2162.
Available for download on Saturday, April 24, 2021