Amphiphilic gradient copolymers of 2-methyl- and 2-phenyl-2-oxazoline: self-organization in aqueous media and drug encapsulation

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Amphiphilic gradient copolymers of 2-methyl- and 2-phenyl-2-oxazoline: self-organization in aqueous media and drug encapsulation

Πίσπας, Στέργιος
Demetzos, Costas
Kaditi, Eleni
Milonaki, Yanna

Άρθρο σε επιστημονικό περιοδικό

2012-03-15


Gradient (or pseudo-diblock) copolymers were synthesized from 2-methyl-2-oxazoline and 2-phenyl-2-oxazoline monomer mixtures via cationic polymerization. The self-assembling properties of these biocompatible gradient copolymers in aqueous solutions were investigated, in an effort to use the produced nanostructures as nanocarriers for hydrophobic pharmaceutical molecules. Dynamic and static light scattering as well as AFM measurements showed that the copolymers assemble in different supramolecular nanostructures (spherical micelles, vesicles and aggregates) depending on copolymer composition. Fluorescence spectroscopy studies revealed a microenvironment of unusually high polarity inside the nanostructures. This observation is related partly to the gradient structure of the copolymers. The polymeric nanostructures were stable with time. Their structural properties in different aqueous mediaPBS buffer, RPMI solutionsimulating conditions used in pharmacological/medicinal studies, have been also investigated and a composition dependent behavior was observed. Finally, the hydrophobic drug indomethacin was successfully encapsulated within the gradient copolymer nanostructures and the properties of the mixed aggregates were studied in respect to the initial copolymer assemblies. The produced aggregates encapsulating indomethacin showed a significant increase of their mass and size compared to original purely polymeric ones.
MALDEN

drug delivery systems
self-assembly
cationic polymerization
polyoxazolines
Polymer Science
gradient copolymers

Αγγλική γλώσσα

John Wiley & Sons, Inc.


Journal of Polymer Science Part A-polymer Chemistry

https://rightsstatements.org/page/InC/1.0/?language=en
© 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
© 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012 (EN)




*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.