Please use this identifier to cite or link to this item: https://doi.org/10.1002/jps.21227
Title: Characterization of spreadability of nonaqueous ethylcellulose gel matrices using dynamic contact angle
Authors: Chow, K.T.
Chan, L.W. 
Heng, P.W.S. 
Keywords: Compressibility
Contact angle
Ethylcellulose
Gel
Semisolid
Silicone elastomer
Skin
Spreadability
Viscosity
Wetting
Issue Date: Aug-2008
Source: Chow, K.T., Chan, L.W., Heng, P.W.S. (2008-08). Characterization of spreadability of nonaqueous ethylcellulose gel matrices using dynamic contact angle. Journal of Pharmaceutical Sciences 97 (8) : 3467-3482. ScholarBank@NUS Repository. https://doi.org/10.1002/jps.21227
Abstract: This study reports the characterization of spreadability of nonaqueous ethylcellulose (EC) gel matrices intended for topical drug delivery using a newly developed method based on dynamic contact angle. EC solutions were prepared using three grades of EC and propylene glycol dicaprylate/dicaprate. Dynamic contact angles of sessile drops of EC solutions on silicone elastomer were measured using a dynamic contact angle analyzer equipped with axisymmetric drop shape analysis-profile. Roughness of silicone elastomer, viscosity of EC solutions and compressibility of semisolid EC gels were determined by the atomic force microscope, cone-and-plate rheometer and tensile tester, respectively. The silicone elastomer employed as a substrate was demonstrated to have similar hydrophilic/lipophilic properties as the human skin. Spread-ability of EC solutions was dependent on EC concentration, polymeric chain length and polydispersity. EC gel spreadability was governed by viscosity and the extent of gel-substrate interaction. From the apparent contact angle values, most EC gel formulations tested were found to be moderately spreadable. Linear correlation observed between spreading parameter and compressibility of EC gel verified the applicability of dynamic contact angle to characterize EC gel spreadability. Thus, the feasibility of employing dynamic contact angle as an alternative technique to measure gel spreadability was demonstrated. The spreadability demonstrated by EC gel would facilitate application on the skin indicating its potential usefulness as a topical dosage form. © 2007 Wiley-Liss, Inc. and the American Pharmacists Association.
Source Title: Journal of Pharmaceutical Sciences
URI: http://scholarbank.nus.edu.sg/handle/10635/105719
ISSN: 00223549
DOI: 10.1002/jps.21227
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