Please use this identifier to cite or link to this item:
|Title:||Development of novel nonaqueous ethylcellulose gel matrices: Rheological and mechanical characterization|
|Authors:||Heng, P.W.S. |
|Citation:||Heng, P.W.S., Chan, L.W., Chow, K.T. (2005-04). Development of novel nonaqueous ethylcellulose gel matrices: Rheological and mechanical characterization. Pharmaceutical Research 22 (4) : 676-684. ScholarBank@NUS Repository. https://doi.org/10.1007/s11095-005-2484-z|
|Abstract:||Purpose. This study reports the rheological and mechanical characterization of novel non-aqueous ethylcellulose gel matrices intended for topical drug delivery. An attempt was also made to explain the molecular interaction within the gel systems from a molecular conformational approach. Methods. Nonaqueous gel matrices were prepared from three fine particle grades of ethylcellulose and propylene glycol dicaprylate/dicaprate. Continuous and oscillatory shear rheometry was performed using a cone-and-plate rheometer and mechanical characterization was performed using a universal tensile tester. Results. The gel matrices exhibited prominent viscoelastic behaviour, yield stress and thixotropy. Rheological and mechanical properties showed significant upward trends with increased polymeric chain length and polymer concentrations. Good linear correlations were obtained between rheological and mechanical properties. The solvent molecular conformation was found to play a role in affecting the formation of gel networks via intermolecular hydrogen bonding between ethylcellulose polymer chains. Conclusions. Ethylcellulose was successfully formulated as a nonaqueous gel with propylene glycol dicaprylate/dicaprate. The novel nonaqueous gel exhibited rheological profiles corresponding to a physically cross-linked three dimensional gel network, with suitable mechanical characteristics for use as a vehicle for topical drug delivery. Molecular conformation of the solvent was found to influence the molecular interactions associated with formation of ethylcellulose gel networks. © 2005 Springer Science+Business Media, Inc.|
|Source Title:||Pharmaceutical Research|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Nov 10, 2018
WEB OF SCIENCETM
checked on Oct 15, 2018
checked on Oct 19, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.