Approaches to Understanding the Solution-State Organization of Spray-Dried Dispersion Feed Solutions and Its Translation to the Solid State

Matthew K. Defrese, Matthew A. Farmer, Yuhan Long, Lucas R. Timmerman, Younsoo Bae, Patrick J. Marsac

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


It is well established that polymers adopt a range of conformations and solution-state organization in response to varying solution environments, although very little work has been done to understand how these effects might impact the physical stability and bioavailability of spray-dried amorphous dispersions (SDDs). Potentially relevant solution-state polymer-solvent/cosolute interactions include preferential solvation, hydrodynamic size (i.e., polymer swelling or collapse), and solvent quality effects (i.e., attractive or repulsive self-interactions). Of particular interest is the investigation of preferential solvation, defined as the relative attraction or rejection of a cosolvent and/or cosolute from the local environment of a solvated macromolecule, which often occurs in multicomponent macromolecular solutions. As spray drying and other solvent-based dispersion processing necessitates the use of complex media consisting of at least three or more components (drug, polymer, solvent(s), and other possible excipients), the prevalence of this phenomenon is likely. This work characterizes largely unexplored solution-state properties in model spray-dried dispersion feed solutions using light scattering and viscometric techniques to add greater context and guidance in studying these information-rich materials. These systems are found to exhibit complex non-intuitive behavior, which serves to highlight the potential utility of preferential solvation in spray-dried dispersion processing and stability. It is hypothesized that solution-state organization of the liquid feed can be engineered and translated to the solid-state for the optimization of SDD properties.

Original languageEnglish
Pages (from-to)4548-4563
Number of pages16
JournalMolecular Pharmaceutics
Issue number12
StatePublished - Dec 7 2020

Bibliographical note

Funding Information:
This work was supported by a Pre-Doctoral Fellowship in Pharmaceutics awarded by the Pharmaceutical Research and Manufacturers of America Foundations (PhRMA Foundation) and by the Center for Pharmaceutical Development (CPD). The authors declare that there is no conflict of interests in the publication of this paper.

Publisher Copyright:

Copyright 2021 Elsevier B.V., All rights reserved.


  • intrinsic viscosity
  • light scattering
  • multicomponent solutions
  • preferential solvation
  • solvent quality
  • spray-dried amorphous dispersions

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery


Dive into the research topics of 'Approaches to Understanding the Solution-State Organization of Spray-Dried Dispersion Feed Solutions and Its Translation to the Solid State'. Together they form a unique fingerprint.

Cite this