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Blends of reverse enteric polymer with Enteric and pH-independent polymers: mechanistic investigations for tailoring drug release.
- Source :
-
Biomacromolecules [Biomacromolecules] 2007 Jan; Vol. 8 (1), pp. 240-51. - Publication Year :
- 2007
-
Abstract
- Blends of conventional reverse enteric polymer with enteric polymers result in insoluble polyelectrolyte complexes and hence cannot be used in film coatings. We report a new set of miscible blends of a new reverse enteric polymer (NREP) synthesized by us with enteric and pH-independent polymers. The nature of interactions between polymers in the blends has been established by analyzing Fourier transform infrared (FTIR) spectra. The extent of interaction has been investigated by thermal analysis and quantified in terms of parameters K1 and K2 in the Schneider equation. Based on these values, the interactions between NREP and these polymers have been ranked in the order EC (ethylcellulose) < ES (Eudragit S) < HPMCP (hydroxypropyl methylcellulose phthalate). The quantification of interactions in blends helps explain the release pattern of cefuroxime axetil (CA) at gastric pH and tailor the release of other drugs according to their pharmacokinetic characteristics. The understanding also provides a more rational approach for selection of polymers and their content in the coating compositions, rather than an empirical approach.
- Subjects :
- Cellulose chemistry
Chemistry, Pharmaceutical methods
Delayed-Action Preparations
Hydrogen-Ion Concentration
Kinetics
Macromolecular Substances chemistry
Methylcellulose analogs & derivatives
Methylcellulose chemistry
Models, Chemical
Molecular Conformation
Spectroscopy, Fourier Transform Infrared
Time Factors
Polymers chemistry
Tablets, Enteric-Coated chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1525-7797
- Volume :
- 8
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Biomacromolecules
- Publication Type :
- Academic Journal
- Accession number :
- 17206813
- Full Text :
- https://doi.org/10.1021/bm060540+