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KMID : 0604519850110010013
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Journal of the Society of Cosmetic Scientists of Korea
1985 Volume.11 No. 1 p.13 ~ p.20
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Inactivation of the Preservative in Cosmetic by the Addition of Inorganic Powder
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Jeong Kwang-Soo
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Abstract
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The decreased preservative effect by tale and TiO_2 for emulsions obtained with polyoxyethylene surfactant was studied by various analytical methods and biological test. The preservative effect of methyl p-hydroxybenzoate was decreased by the addition of talc and TiO_2 and this result was attributed to the adsorption of methyl p-hydroxybenzoate on them. Talc exhibited more decreased preservative effect than that of TiO_2. The amount of the adsorption of methyl p-phydroxybenzoate by talc at 20^{circ}C could be represented by the following equation; a=11.511C^{0.747}.
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