<![CDATA[Citronella oil (Cymbopogon nardus) is an essential oil which useful as an antibacterial that is usuallyprovided in the form of macroemulsion for topical use. absorption of macroemulsion through the skin relatively low, thermodynamically is not stable and can produce a separate phase in the storage period. The one of development emulsion system to get better characteristics is to form a microemulsion. Microemulsion is an oil and water dispersion stable thermodynamically stabilized by surfactants and in some cases a cosurfactant. The objective of this study was to formulatecitronella oil in the form of a stable microemulsion using nonionic surfactant. Optimization of the type and amount of emulsifier (surfactant) was required to formulate a stable microemulsion. In this study, microemulsion was evaluated during a month. Type and concentration of surfactant, cosurfactant, Citronella oil (Cymbopogon nardus) and water was optimized. A stable citronella oil microemulsion was successfully created with composition of 15% PEG 400 as cosurfactant, 15% tween 80 as surfactant, 2-4% Citronella oil as oil phase and 10% glycerin as humectant and distilled water as aqueous phase. From the observation, microemulsion formula has clear appearance but physically unstable during a month storage]]>
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