Tags

Type your tag names separated by a space and hit enter

Graft copolymers of ethyl methacrylate on waxy maize starch derivatives as novel excipients for matrix tablets: drug release and fronts movement kinetics.
Eur J Pharm Biopharm. 2012 Apr; 80(3):674-81.EJ

Abstract

A previous paper deals with the physicochemical and technological characterization of novel graft copolymers of ethyl methacrylate (EMA) on waxy maize starch (MS) and hydroxypropylstarch (MHS). The results obtained suggested the potential application of these copolymers as excipients for compressed non-disintegrating matrix tablets. Therefore, the purpose of the present study was to investigate the mechanism governing drug release from matrix systems prepared with the new copolymers and anhydrous theophylline or diltiazem HCl as model drugs with different solubility. The influence of the carbohydrate nature, drying procedure and initial pore network on drug release kinetics was also evaluated. Drug release experiments were performed from free tablets. Radial drug release and fronts movement kinetics were also analysed, and several mathematical models were employed to ascertain the drug release mechanisms. The drug release markedly depends on the drug solubility and the carbohydrate nature but is practically not affected by the drying process and the initial matrix porosity. A faster drug release is observed for matrices containing diltiazem HCl compared with those containing anhydrous theophylline, in accordance with the higher drug solubility and the higher friability of diltiazem matrices. In fact, although diffusion is the prevailing drug release mechanism for all matrices, the erosion mechanism seems to have some contribution in several formulations containing diltiazem. A reduction in the surface exposed to the dissolution medium (radial release studies) leads to a decrease in the drug release rate, but the release mechanism is not essentially modified. The nearly constant erosion front movement confirms the behaviour of these systems as inert matrices where the drugs are released mainly by diffusion through the porous structure.

Links

Publisher Full Text
Aggregator Full Text

Authors+Show Affiliations

Marinich JA
Departamento de Farmacia y Tecnología Farmacéutica, Universidad de Sevilla, Sevilla, Spain.
Ferrero C
No affiliation info available
Jiménez-Castellanos MR
No affiliation info available

MeSH

CarbohydratesChemistry, PharmaceuticalDiffusionDiltiazemDrug CompoundingExcipientsKineticsMethylmethacrylatesModels, TheoreticalPolymersPorositySolubilityStarchTabletsTechnology, PharmaceuticalTheophyllineZea mays

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22210473

Citation

Marinich, J A., et al. "Graft Copolymers of Ethyl Methacrylate On Waxy Maize Starch Derivatives as Novel Excipients for Matrix Tablets: Drug Release and Fronts Movement Kinetics." European Journal of Pharmaceutics and Biopharmaceutics : Official Journal of Arbeitsgemeinschaft Fur Pharmazeutische Verfahrenstechnik E.V, vol. 80, no. 3, 2012, pp. 674-81.
Marinich JA, Ferrero C, Jiménez-Castellanos MR. Graft copolymers of ethyl methacrylate on waxy maize starch derivatives as novel excipients for matrix tablets: drug release and fronts movement kinetics. Eur J Pharm Biopharm. 2012;80(3):674-81.
Marinich, J. A., Ferrero, C., & Jiménez-Castellanos, M. R. (2012). Graft copolymers of ethyl methacrylate on waxy maize starch derivatives as novel excipients for matrix tablets: drug release and fronts movement kinetics. European Journal of Pharmaceutics and Biopharmaceutics : Official Journal of Arbeitsgemeinschaft Fur Pharmazeutische Verfahrenstechnik E.V, 80(3), 674-81. https://doi.org/10.1016/j.ejpb.2011.12.005
Marinich JA, Ferrero C, Jiménez-Castellanos MR. Graft Copolymers of Ethyl Methacrylate On Waxy Maize Starch Derivatives as Novel Excipients for Matrix Tablets: Drug Release and Fronts Movement Kinetics. Eur J Pharm Biopharm. 2012;80(3):674-81. PubMed PMID: 22210473.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Graft copolymers of ethyl methacrylate on waxy maize starch derivatives as novel excipients for matrix tablets: drug release and fronts movement kinetics. AU - Marinich,J A, AU - Ferrero,C, AU - Jiménez-Castellanos,M R, Y1 - 2011/12/21/ PY - 2011/05/02/received PY - 2011/11/20/revised PY - 2011/12/13/accepted PY - 2012/1/3/entrez PY - 2012/1/3/pubmed PY - 2012/9/13/medline SP - 674 EP - 81 JF - European journal of pharmaceutics and biopharmaceutics : official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V JO - Eur J Pharm Biopharm VL - 80 IS - 3 N2 - A previous paper deals with the physicochemical and technological characterization of novel graft copolymers of ethyl methacrylate (EMA) on waxy maize starch (MS) and hydroxypropylstarch (MHS). The results obtained suggested the potential application of these copolymers as excipients for compressed non-disintegrating matrix tablets. Therefore, the purpose of the present study was to investigate the mechanism governing drug release from matrix systems prepared with the new copolymers and anhydrous theophylline or diltiazem HCl as model drugs with different solubility. The influence of the carbohydrate nature, drying procedure and initial pore network on drug release kinetics was also evaluated. Drug release experiments were performed from free tablets. Radial drug release and fronts movement kinetics were also analysed, and several mathematical models were employed to ascertain the drug release mechanisms. The drug release markedly depends on the drug solubility and the carbohydrate nature but is practically not affected by the drying process and the initial matrix porosity. A faster drug release is observed for matrices containing diltiazem HCl compared with those containing anhydrous theophylline, in accordance with the higher drug solubility and the higher friability of diltiazem matrices. In fact, although diffusion is the prevailing drug release mechanism for all matrices, the erosion mechanism seems to have some contribution in several formulations containing diltiazem. A reduction in the surface exposed to the dissolution medium (radial release studies) leads to a decrease in the drug release rate, but the release mechanism is not essentially modified. The nearly constant erosion front movement confirms the behaviour of these systems as inert matrices where the drugs are released mainly by diffusion through the porous structure. SN - 1873-3441 UR - https://www.unboundmedicine.com/medline/citation/22210473/Graft_copolymers_of_ethyl_methacrylate_on_waxy_maize_starch_derivatives_as_novel_excipients_for_matrix_tablets:_drug_release_and_fronts_movement_kinetics_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0939-6411(11)00363-8 DB - PRIME DP - Unbound Medicine ER -