JOURNAL OF COSMETIC SCIENCE 368 Table III pH and Sp Values of the Three Compared Cosmetic Creams Parameter DSO/DSAE cosmetic Standard cosmetic Commercial cosmetic pH 6.33 ± 0.72b 3.71 ± 0.02c 7.92 ± 0.01a Sp (cm2) 14.78 ± 1.92a 14.99 ± 1.55a 15.97 ± 2.82a Ct (%) 100 100 100 a,b,c Same letters on the same line indicate the absence of signifi cant difference (p ≤ 0.05) between values. The rheological behavior of the elaborated cosmetic is similar to those of certain formula- tions studied by Djuris et al. (22), who have used cetearyl glucoside as a natural emulsifi er and a mixture of lipophilic coemulsifi ers as a stabilizer of the emulsion. The power model of Ostwald-de Wealk (37) was applied for modeling rheological behav- ior of the obtained cosmetic cream. τ = kγη where, τ is the sheer strain, k the uniformity index, γ the sheer rate, and η the fl ow index. The fl ow index for the three cosmetics is below 1: standard cosmetic (n = 0.2995), cos- metic added with date seed derivatives (n = 0.4151), and commercial cosmetic (n = 0.4669). The similar values between the last products must be noticed. From point of view of rheological behavior, the obtained cosmetic is of pseudoplastic type. This fi nding is concordant with that of Guaratini et al. (37) about a cosmetic cream added with vitamins A and E. Moreover, the same authors postulated that such confi gura- tion is suitable for cosmetics. Comparative Values of pH, Sp, and Ct. Table III shows that the pH values of the three com- pared cosmetics are statistically different (p ≤ 0.05), but those of the commercial and elaborated cosmetic are similar to the required pH. In opposite, the corresponding Sp and Ct values (Table III) are not statistically different (p ≤ 0.05) and are in the suitable range. CONCLUSION Globally, results show that there is a relatively wide range of ingredient proportions that allows one to obtain a suitable moisturizing cosmetic cream, according to the Sp and Vis. In opposite to the storage time, the DSO was found to act positively on the both Vis and PI. From point of view of rheological behavior, the obtained cosmetic cream is of pseudoplas- tic type. Since the results confi rm the feasibility of the studied cosmetic, it would be interesting to deepen certain analysis (statistics, stability, and dermatological testing). Considering the potential health of natural ingredients contained in the elaborated cos- metic cream, the latter has promising prospects. In particular, it may generate interest

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