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KMID : 1234420120400030237
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Korean Journal of Microbiololgy and Biotechnology
2012 Volume.40 No. 3 p.237 ~ p.242
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A Determination of the Moisturizing Effect and Stability of a Cream Containing Lespedeza cuneata G. Don Extracts
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Lee Hye-Jin
Gu Hyun-A
Park Soo-Nam
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Abstract
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In this study, the skin moisturing effect and stability of cream containing L. cuneata G. Don extract (ethyl acetate fraction) were evaluated. The skin hydrating effect of the cream containing extract was 1020% higher than the placebo cream, and the TWEL of the cream containing extracts was decreased to 7.7 g/m2h compared to the control (10.2 g/m2) and placebo cream (8.9 g/m2h). The pH, viscosity, and absorbance were measured under the 4, 25, 37, 45oC and the sun light during the 12 weeks. The pH change between cream containing extract and placebo cream did not show the significant difference under the 4, 25, 37, 45oC except for the sun light. Both creams showed high decrease (about 59%) of viscosity at 45oC. However, there was no significant change under other conditions. The absorbance of the cream containing the extract and the placebo cream was decreased similarly at all conditions. This decrease in absorbance was relatively small compared to the decrease of absorbance of the extract in ethanol solution under the sun light (Fig. 7). In addition, any change in color or smell of the cream was not observed during the 12 weeks. Also physical changes as creaming and cohesion were not shown. These results indicate that the cream containing L. cuneata extract has the skin moisturizing effect and is relatively stable. Therefore, it is suggested that the ethyl acetate fraction of L. cuneata extract could be applicable to cosmetics as a new cosmetic material with its antioxidative and antibacterial activities reported previously.
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KEYWORD
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Lespedeza cuneata G. Don, cream, stability test, moisture, cosmetics
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