Effect of Hydration on Physicochemical Properties of End-Capped PLGA
Joint Authors
Dorati, Rossella
D'Souza, Susan
DeLuca, Patrick P.
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-08-13
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
The objective of this study was to assess the physicochemical effects of hydrating a hydrophobic end-capped poly(lactide-co-glycolide) (PLGA) polymer in the liquid and vapor state.
PLGA RG503 polymer was incubated at 37°C in 0.5% polyvinyl alcohol (PVA) solution and at 90% RH.
Samples were withdrawn at predetermined intervals and changes to polymer properties like glass transition temperature (Tg), moisture uptake, molecular weight change, and % acid number were determined using differential scanning calorimetry, Karl Fisher titrimetry, gel permeation chromatography, and acid base titrimetry, respectively.
Study results showed that Tg was depressed instantaneously upon hydration, indicating that bulk water acted as a plasticizer of hydrophobic end-capped PLGA.
Tg values decreased to levels below the incubation temperature when hydrated in 0.5% PVA solution but not in 90% RH.
The drop in Tg exhibited a linear relationship (R2>0.99) to the amount of water uptake by the polymer; higher moisture uptake was noted with liquid water.
Removal of moisture from the polymer matrix resulted in recovery of Tg, only up to a period of 14 days.
Presence of water in liquid or vapor form caused a reduction in molecular weight of the polymer and a corresponding increase in % acid number over the duration of the study.
American Psychological Association (APA)
D'Souza, Susan& Dorati, Rossella& DeLuca, Patrick P.. 2014. Effect of Hydration on Physicochemical Properties of End-Capped PLGA. Advances in Biomaterials،Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-501881
Modern Language Association (MLA)
D'Souza, Susan…[et al.]. Effect of Hydration on Physicochemical Properties of End-Capped PLGA. Advances in Biomaterials No. 2014 (2014), pp.1-9.
https://search.emarefa.net/detail/BIM-501881
American Medical Association (AMA)
D'Souza, Susan& Dorati, Rossella& DeLuca, Patrick P.. Effect of Hydration on Physicochemical Properties of End-Capped PLGA. Advances in Biomaterials. 2014. Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-501881
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-501881