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KMID : 0903520050480030273
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
2005 Volume.48 No. 3 p.273 ~ p.279
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A Study on the Development of Cosmeceutical Ingredient, Rhododendron mucronulatum, and the Application of Rheology Properties
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An Bong-Jeun
Lee Jin-Tae
Lee Chang-Eon
Son Jun-Ho
Lee Jin-Young
Park Tae-Soon
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Abstract
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To develop cosmetics using Jindalae flowers (Rhododendron mucronulatum), the surface tensions of extracts were measured and the properties and stability of cream with extracts were investigated. The surface tension of 0.1% ethanol extract was 30.42 mN/m and that of distilled water was 72.2 mN/m. The surface tension of cream with 0.1% ethanol extract was similar to that of sample cream and the measured pH were weakly alkalic. The surface tension of 1% ethanol extract was the lowest value of 24.98 mN/m, the measured pH of cream with 1% ethanol extract was weakly acidic and the particle size of cream was stable. According to an oscillatory test, linear viscoelastic region was extended by adding of 1% water extract and 1% ethanol extract to cream, indicating that the cream had greater enhanced resistance for preserving inner structure as compared to outside stress. Besides, as a result of the diminished loss angle of ethanol extract cream, the elasticity of cream was increased more than that of sample cream and cream with 0.1% ethanol extract. In contrast, in the case of the increased loss angle of water extract cream, the viscosity of cream was increased. In conclusion, Rhododendron mucronulatum can be deliberated as a cosmetic material because 0.1% water and ethanol extracts showed efficacious physiological activities and cream with 1% extracts could extend linear viscoelastic region.
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KEYWORD
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Rhododendron mucronulatum, surface tension, linear viscoelastic region, cosmetic ingredients
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