Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Impact of Polymer Type on Thermal Degradation of Amorphous Solid Dispersions Containing Ritonavir

Full text
de Alvarenga, Jr., Benedito Roberto [1, 2] ; Moseson, Dana E. [1] ; Carneiro, Renato Lajarim [2] ; Taylor, Lynne S. [1]
Total Authors: 4
[1] Purdue Univ, Coll Pharm, Dept Ind & Phys Pharm, W Lafayette, IN 47907 - USA
[2] Univ Fed Sao Carlos, Dept Chem, BR-13560905 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 0

High-temperature exposure during hot melt extrusion processing of amorphous solid dispersions may result in thermal degradation of the drug. Polymer type may influence the extent of degradation, although the underlying mechanisms are poorly understood. In this study, the model compound, ritonavir (T-m = 126 degrees C), undergoes thermal degradation upon high-temperature exposure. The extent of degradation of ritonavir in amorphous solid dispersions (ASDs) formulated with poly(vinylpyrrolidone) (PVP), poly(vinylpyrrolidone vinyl acetate copolymer (PVP/VA), hydroxypropyl methylcellulose acetate succinate (HPMCAS), and hydroxypropyl methylcellulose (HPMC) following isothermal heating and hot melt extrusion was evaluated, and mechanisms related to molecular mobility and intermolecular interactions were assessed. Liquid chromatography-mass spectrometry (LC-MS/MS) studies were used to determine the degradation products and pathways and ultimately the drug- polymer compatibility. The dominant degradation product of ritonavir was the result of a dehydration reaction, which then catalyzed a series of hydrolysis reactions to generate additional degradation products, some newly reported. This reaction series led to accelerated degradation rates with protic polymers, HPMCAS and HPMC, while ASDs with aprotic polymers, PVP and PVP/VA, had reduced degradation rates. This work has implications for understanding mechanisms of thermal degradation and drug-polymer compatibility with respect to the thermal stability of amorphous solid dispersions. (AU)

FAPESP's process: 19/22048-1 - Evaluation of the degradation products of Ritonavir antiretroviral drug during hot extrusion process (HME)
Grantee:Benedito Roberto de Alvarenga Junior
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 17/13095-0 - Experimental design applied to forced degradation of Nitazoxanide and Sofosbuvir pharmaceutical drugs
Grantee:Benedito Roberto de Alvarenga Junior
Support Opportunities: Scholarships in Brazil - Doctorate