Behavior of methylparaben in emulsified cosmetics containing powder.
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概要
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The emulsified cosmetics containing powder are composed of such complex systems that their antimicrobial activity often becomes a problem. First, we investigated the behavior of methylparaben (MP) in these systems to estimate the concentration of the active form of parabens.Adsorption of MP by powder was expressed as a linear function of the initial concentration of MP (Co) when the powder content was constant.In the system containing powder and surfactant, the concentration of free MP in the aqueous phase (C3) was 62-65% of Co.In a model emulsion containing powder, the corresponding value (C5) was 20-27% of Co. In this system, the free MP in the aqueous phase before the powder addition was considered to be mainly adsorbed by powder.
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