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Effects of molecular weight on permeability and microstructure of mixed ethyl-hydroxypropyl-cellulose films
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.ORCID iD: 0000-0003-0310-4465
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2013 (English)In: European Journal of Pharmaceutical Sciences, ISSN 0928-0987, E-ISSN 1879-0720, Vol. 48, no 42006, p. 240-248Article in journal (Refereed) Published
Abstract [en]

Films of ethyl cellulose (EC) and water-soluble hydroxypropyl cellulose (HPC) can be used for extended release coatings in oral formulations. The permeability and microstructure of free EC/HPC films with 30% w/w HPC were studied to investigate effects of EC molecular weight. Phase separation during film spraying and subsequent HPC leaching after immersion in aqueous media cause pore formation in such films. It was found that sprayed films were porous throughout the bulk of the films after water immersion. The molecular weight affected HPC leaching, pore morphology and film permeability; increasing the molecular weight resulted in decreasing permeability. A model to distinguish the major factors contributing to diffusion retardation in porous films showed that the trend in permeability was determined predominantly by factors associated with the geometry and arrangement of pores, independent of the diffusing species. The film with the highest molecular weight did, however, show an additional contribution from pore wall/permeant interactions. In addition, rapid drying and increasing molecular weight resulted in smaller pores, which suggest that phase separation kinetics affects the final microstructure of EC/HPC films. Thus, the molecular weight influences the microstructural features of pores, which are crucial for mass transport in EC/HPC films. © 2012 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2013. Vol. 48, no 42006, p. 240-248
Keywords [en]
Food Engineering
Keywords [sv]
Livsmedelsteknik
National Category
Food Science
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URN: urn:nbn:se:ri:diva-8529DOI: 10.1016/j.ejps.2012.11.003PubMedID: 23159668OAI: oai:DiVA.org:ri-8529DiVA, id: diva2:966401
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2018-08-20Bibliographically approved

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Stading, Mats

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