Characterisation and stability study of emulsion loaded with zinc oxide or titanium dioxide for cosmetic applications

The aim of this study was to evaluate the physical characteristics and stability of creams formulated with a commercial thickening emulsifier (Gelinov'") that are loaded with zinc oxide or titanium dioxide. The study was done by conducting physical characteristics evaluation involving particle size analysis, texture analysis and Sun Protection Factor (SPF) analysis of the creams using Mastersizer 2000 (Malvern Instrument Ltd., UK), T A.XT Texture Analyzer (Stable Micro Systems, Goldalming, UK), and SPF-290S (Optometries Corporation, USA), respectively. The stability study of creams was conducted using LUMiFuge (L.U.M. GmbH, Berlin, Germany). The results of this study show that the loading of zinc oxide or titanium dioxide contributes to the changes on the physical characteristics of the creams significantly. Additionally, a positive correlation was observed between SPF values and the concentration of zinc oxide or titanium dioxide.All the creams are noted to be stable for 6 month accelerated study using LUMiFuge stability analyzer.