Synthesis of Aspirin-loaded Polymer–Silica Composites and their Release Characteristics

This study describes a novel approach to the synthesis of polymer–drug–silica nanocomposites via encapsulation/isolation of drug molecules, introduced into the polymer matrix by the silica gel. For the first time, tetraethoxysilane (TEOS) gelation in the vapor phase of the acidic catalyst is present...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2014-08, Vol.6 (16), p.14369-14376
Main Author: Kierys, Agnieszka
Format: Article
Language:English
Subjects:
Aspirin - chemistry
Nanocomposites - chemistry
Polymers - chemistry
Silicon Dioxide - chemistry
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Summary:This study describes a novel approach to the synthesis of polymer–drug–silica nanocomposites via encapsulation/isolation of drug molecules, introduced into the polymer matrix by the silica gel. For the first time, tetraethoxysilane (TEOS) gelation in the vapor phase of the acidic catalyst is presented as an efficient method to enter the silica gel nanoparticles into the polymer–aspirin conjugate. The conducted studies reveal that the internal structure of the polymer carrier is significantly reorganized after the embedding of aspirin molecules and the silica gel. The total porosity of the polymer–drug–silica nanocomposites and the molecular structure of the silica gel embedded in the system strongly depend on the conditions of the silica source transformation. Additionally, the release of the drug was fine-tuned by adapting the conditions of hydrolysis and condensation of the silica gel precursor. Finally, to prove the usefulness of the proposed synthesis, the controlled release of aspirin from the polymer–drug–silica nanocomposites is demonstrated.
ISSN:1944-8244
1944-8252
DOI:10.1021/am5036384