期刊
INTERNATIONAL JOURNAL OF PHARMACEUTICS
卷 256, 期 1-2, 页码 75-84出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0378-5173(03)00064-4
关键词
cream structure; contact angle; rheology; thermal analysis; evaporation of water
The object of the study was to analyse relationship between the rheological properties, thermogravimetric behaviour, physical stability, and the wetting contact angle of the lipophilic and aqueous phase of 300 creams of different compositions with a high water content (60-80%, w/w). The starting point was Junginger's theory: water is found in the cream structure in energetic (interlamellar) and steric forms (bulk water). Based on our investigations, an exponential function was found to exist between the contact angle of wetting and the slope of the TG-curves, between the contact angle of wetting and the viscosity of the creams, and between the contact angle of wetting and the evaporation rate of water. A linear relationship was found between the contact angle of wetting and the quantity of water separable by centrifugation. (C) 2003 Elsevier Science B.V. All rights reserved.
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