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Solid cellulose nanofiber based foams – Towards facile design of sustained drug delivery systems
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science.
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2016 (English)In: Journal of Controlled Release, ISSN 0168-3659, E-ISSN 1873-4995, Vol. 244, 74-82 p.Article in journal (Refereed) Published
Abstract [en]

Control of drug action through formulation is a vital and very challenging topic within pharmaceutical sciences. Cellulose nanofibers (CNF) are an excipient candidate in pharmaceutical formulations that could be used to easily optimize drug delivery rates. CNF has interesting physico-chemical properties that, when combined with surfactants, can be used to create very stable air bubbles and dry foams. Utilizing this inherent property, it is possible to modify the release kinetics of the model drug riboflavin in a facile way. Wet foams were prepared using cationic CNF and a pharmaceutically acceptable surfactant (lauric acid sodium salt). The drug was suspended in the wet-stable foams followed by a drying step to obtain dry foams. Flexible cellular solid materials of different thicknesses, shapes and drug loadings (up to 50 wt%) could successfully be prepared. The drug was released from the solid foams in a diffusion-controlled, sustained manner due to the presence of intact air bubbles which imparted a tortuous diffusion path. The diffusion coefficient was assessed using Franz cells and shown to be more than one order of magnitude smaller for the cellular solids compared to the bubble-free films in the wet state. By changing the dimensions of dry foams while keeping drug load and total weight constant, the drug release kinetics could be modified, e.g. a rectangular box-shaped foam of 8 mm thickness released only 59% of the drug after 24 h whereas a thinner foam sample (0.6 mm) released 78% of its drug content within 8 h. In comparison, the drug release from films (0.009 mm, with the same total mass and an outer surface area comparable to the thinner foam) was much faster, amounting to 72% of the drug within 1 h. The entrapped air bubbles in the foam also induced positive buoyancy, which is interesting from the perspective of gastroretentive drug-delivery.

Place, publisher, year, edition, pages
2016. Vol. 244, 74-82 p.
Keyword [en]
cellular solid material; cellulose nanofibers; foam; gastric retention device; Riboflavin; sustained release
National Category
Pharmaceutical Sciences Polymer Chemistry Medical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-27577DOI: 10.1016/j.jconrel.2016.11.009Scopus ID: 2-s2.0-84995938255OAI: oai:DiVA.org:ri-27577DiVA: diva2:1058290
Available from: 2016-12-20 Created: 2016-12-19 Last updated: 2017-01-05Bibliographically approved

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CiteExportLink to record
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