RESULTS AND DISCUSSION
1. Selection of anti-acne gel
Chemical and physical properties of 9 samples of anti-acne gel are showed in Table 1 and 2.
The result showed that pH, viscosity, L*, a* and b* of product were significantly change as the level of
Carbopol Ultrez-10 and mangosteen crude extract increased. pH value of product ranged from 5.89
to 6.27 which represented weak acidity of anti-acne gels. Viscosity of anti-acne gels increased as the
amount of Carbopol Ultrez-10 increased, while, increasing level of mangosteen crude extract had
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more effect to decrease viscosity of anit-acne gel. Color of all formulas had dark yellow color (low in
a* and b*), which were effected form yellow-brown color of mangosteen crude extract. As the amount
of crude extract increased the b* value of anti-acne gel increased.
Sensory evaluation of nine samples of anti-acne gel were showed in table 2. The result
showed that ANOVA indicates no significant differences were observed for the mean hedonic scores
of color absorption and skin moisturizer among the nine samples mean hedonic scores. Viscosity and
overall liking were significantly different among nine samples. All attributes of the samples that
contained 0.5% of Carbopol Ultrez-10 and 0.5% of mangosteen crude extract showed higher score
than other samples. It was noticed that mean score of color of all samples in the level of neither like
nor dislike to slightly–like, that was effected form some panelists did not like color of anti-acne gel.
Sample with contained 0.5% of Carbopol Ultrez-10 and 0.5% of mangosteen crude extract were
selected according to sensory analysis and cost of production.