The decreased preservative effect by talc and TiO₂ 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 TiO₂ and this result was attributed to the adsorption of methyl p-hydroxybenzoate on them. Talc exhibited more decreased preservative effect than that of TiO₂. The amount of the adsorption of methyl p-hydroxybenzoate by talc at 20℃ could be represented by the following equation; a=11.511C^0.747.

Polyoxyethylene계 유화제를 이용한 유화계에 있어서 talc 및 TiO₂에 의한 methyl p-hydroxy benzoate의 흡착과 그에 따른 방부력 감소를 여러 가지 분석 방법과 미생물 실험을 통하여 측정하였다. 이 유화계에 있어서 methy1 p-hydroxy benzoate는 talc 및 TiO₂에 흡착되어 방부력이 감소함을 알 수 있었으며 방부력 저하에 미치는 영향은 TiO₂보다 talc가 더 크고, talc에 의한 methyl p-hydroxy benzoate의 흡착량은 20℃에서 다음과 같은 식으로 나타낼 수 있었다. 즉 a=11.511C^0.747

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