title: Preparation and physicochemical properties of surfactant-free emulsions using electrolytic-reduction ion water containing lithium magnesium sodium silicate.
abstract: Surfactant-free emulsions by adding jojoba oil, squalane, olive oil, or glyceryl trioctanoate (medium chain fatty acid triglycerides, MCT) to electrolytic-reduction ion water containing lithium magnesium sodium silicate (GE-100) were prepared, and their physiochemical properties (thixotropy, zeta potential, and mean particle diameter) were evaluated. At an oil concentration of 10%, the zeta potential was ‒22.3 ‒ ‒26.8 mV, showing no marked differences among the emulsions of various types of oil, but the mean particle diameters in the olive oil emulsion (327 nm) and MCT emulsion (295 nm) were smaller than those in the other oil emulsions (452-471 nm). In addition, measurement of the hysteresis loop area of each type of emulsion revealed extremely high thixotropy of the emulsion containing MCT at a low concentration and the olive emulsion. Based on these results, since surfactants and antiseptic agents markedly damage sensitive skin tissue such as that with atopic dermatitis, surfactant- and antiseptic-free emulsions are expected to be new bases for drugs for external use.
authors.affiliation: Department of Pharmaceutical Sciences, Meiji Pharmaceutical University, Tokyo, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Okajima
authors.forename: Yuko
authors.initials: Y
authors.lastname: Wada
authors.forename: Takashi
authors.initials: T
authors.lastname: Hosoya
authors.forename: Fumio
authors.initials: F
authors.lastname: Hino
authors.forename: Yoshiyasu
authors.initials: Y
authors.lastname: Kitahara
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Shimokawa
authors.forename: Fumiyoshi
authors.initials: F
authors.lastname: Ishii
mesh_terms: D002210:Caprylates / Q000737:chemistry; D004572:Electrolysis; D004655:Emulsions / Q000138:chemical synthesis / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D017633:Magnesium Silicates / Q000737:chemistry; D000069463:Olive Oil; D010316:Particle Size; D014677:Pharmaceutical Vehicles / Q000138:chemical synthesis / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry; D012212:Rheology; D017640:Silicates / Q000737:chemistry; D013185:Squalene / Q000031:analogs & derivatives / Q000737:chemistry; D014280:Triglycerides / Q000737:chemistry; D014783:Viscosity; D014867:Water / Q000737:chemistry; D014885:Waxes / Q000737:chemistry
chemical_list: D002210:Caprylates; D004655:Emulsions; D017633:Magnesium Silicates; D000069463:Olive Oil; D014677:Pharmaceutical Vehicles; D010938:Plant Oils; D017640:Silicates; D014280:Triglycerides; D014885:Waxes; C583464:lithium magnesium sodium silicate; D014867:Water; C003637:tricaprylin; C034743:jojoba wax; D013185:Squalene; D008094:Lithium; C033214:Smectite; C019556:squalane; D008274:Magnesium; C005691:sodium silicate