SKIN CARE
Table 4: Test formulations compared to baseline (p-values <0.05; 95% confidence level). Test formulation
Zemea vs. glycerin
Zemea vs. Zemea/glycerin mix Glycerin vs. Zemea/glycerin mix
the test sites and the untreated site prior to application of the test formulations, confirming the validity of the study. All three test formulations produced statistically significant increases in hydration of the skin at the 1-hour and 4-hour assessments compared to the baseline. At the 24-hour assessment, the glycerin and the biobased propanediol/ glycerin mix produced statistically significant increases in hydration. These conclusions are supported by p-values which are less than 0.05 in Table 3. The glycerin and the biobased propanediol/glycerin mix showed statistical differences in skin hydration vs. biobased propanediol. No statistical differences in skin hydration were observed between glycerin and the biobased propanediol/ glycerin mix at any time-points. These conclusions are supported by p-values which are less than 0.05 in Table 4.
0.0014 0.0043 0.3009
Between-treatment comparison 1 hour 4 hours 24 hours 0.0089
0.0240 0.3391
Consumer sensory perception
Consumer sensory ratings for the lotion containing biobased propanediol were higher on all of the attributes than the lotions containing glycerin and the biobased propanediol glycerin mix. Eight out of the ten attributes, listed in Table 5, were rated more favourably for the biobased propanediol/glycerin mix vs. glycerin. The mean Consumer Sensory ratings for all three test formulations are shown in Figure 2.
Conclusions
In repeated consumer sensory studies, lotions formulated with Zemea are rated higher on all sensory attributes than lotions formulated with glycerin. Zemea provides good skin hydration results when used in a formulation at both a 5% concentration as well as a higher concentration level of 20%.
0.0033 0.0393 0.1298
Table 5: Attributes rated more favourably for biobased propanediol/glycerin mix vs. glycerin.
•Spreads easily when I apply it on my skin •Skin feels moisturised after using •Has a smooth feel as I apply it on my skin •Leaves a soft feeling on the skin •Does not feel tacky or sticky after application •Does not form a film on the skin •Had a pleasant experience using it •Absorbs into my skin
The addition of Zemea to glycerin-based formulations can improve the consumer perceived aesthetics without compromising hydration performance of the formulation. In addition, all test formulations produced statistically significant increases in hydration of the skin vs. the control for the 1 hour and 4 hour assessments. No statistical differences in skin hydration were observed between the glycerin and the Zemea/glycerin mix at all time-points. Even at 24 hours, the Zemea/glycerin mix and the glycerin formulations were statistically the same in hydration.
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www.siltechpersonalcare.com September 2015 PERSONAL CARE 75
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