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Title: Effect of Water on Molecular Mobility and Physical Stability of Amorphous Pharmaceuticals

Journal Article · · Molecular Pharmaceutics

In this work, we investigated the influence of sorbed water concentration on the molecular mobility and crystallization behavior in a model amorphous drug and a solid dispersion. The temperature scaling ($$T_g/T$$) allowed us to simultaneously evaluate the effects of water content and temperature on the relaxation time. In the supercooled dispersions, once scaled, the relaxation times of the systems with different water content overlapped. Thus, the observed increase in mobility could be explained by the “plasticization” effect of water. This effect also explained the decrease in crystallization onset temperature brought about by water. That is, plasticization is the underlying mechanism governing the observed increase in mobility and physical instability in the supercooled state. Similar results were observed in the glassy drug substance. A single linear relationship was observed between crystallization time (time for 0.5% crystallization) and $$T_g/T$$ in both dry and water containing systems. Since fragility is unaffected by modest amounts of water, much like crystallization time, the mobility in the glass is expected to scale with $$T_g$$.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC); William and Mildred Peters; Center for Pharmaceutical Processing and Research; National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1259882
Journal Information:
Molecular Pharmaceutics, Vol. 13, Issue 4; ISSN 1543-8384
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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Physical Stability of Amorphous Solid Dispersions: a Physicochemical Perspective with Thermodynamic, Kinetic and Environmental Aspects journal April 2018
A novel drug–drug coamorphous system without molecular interactions: improve the physicochemical properties of tadalafil and repaglinide journal January 2020
Mimicked scaffolds based on coated silk woven fabric with gelatin and chitosan for soft tissue defect in oral maxillofacial area journal October 2019
Fluoroquinolone Amorphous Polymeric Salts and Dispersions for Veterinary Uses journal June 2019
Opportunities for Successful Stabilization of Poor Glass-Forming Drugs: A Stability-Based Comparison of Mesoporous Silica Versus Hot Melt Extrusion Technologies journal November 2019
Stabilisation and Growth of Metastable Form II of Fluconazole in Amorphous Solid Dispersions journal December 2019
Comparison of a Novel Miniaturized Screening Device with Büchi B290 Mini Spray-Dryer for the Development of Spray-Dried Solid Dispersions (SDSDs) journal August 2018
Advances in coamorphous drug delivery systems journal January 2019

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