Six plant essential oils, vanillin, and their mixtures were tested for repellent activities against a dengue virus vector mosquito, Aedes aegypti. Their repellency was verified with two conditions: different doses and an addition of vanillin. Among the plant essential oils, lemongrass, lemoneucalyptus and xanthoxylum oils were selected as the potential oils for tertiary mixtures. In bioassays using tertiary mixtures with two essential oils with vanillin, the composition of 1:3:1 (v/v/w) consisted of lemongrass oil, xanthoxylum oil and vanillin provided 270 min-CPT. As a practical application into spatial repellent, the mixture of 1:1:1 formulation containing lemongrass oil, xanthoxylum oil, and vanillin (v/v/w) was enclosed into the Viscopearl, porous cellulose beads that provide gradual release of volatile compounds. We composed this Viscopearl into a module and installed into the air conditioner. Apparently, repellent activity was shown that average repellency of 83.5% was observed for an hour through the chamber test. We confirmed via GC-chromatogram that linalool, geraniol, citral and vanillin were the main compounds of our oil mixture. Our study indicates that personal repellents were possibility applicable to spatial repellents.

• Hyung Wook Kwon(WCU Biomodulation Major, Department of Agricultural Biotechnology, Seoul National University)
• Sung-Hwa Lee(Heating Solution Gr. IEQ team, CTO AC R&D Lab., LG Electronics Inc.)
• Soon-Il Kim(WCU Biomodulation Major, Department of Agricultural Biotechnology, Seoul National University)
• June-Sun Yoon(WCU Biomodulation Major, Department of Agricultural Biotechnology, Seoul National University)
• Seung-Jae Beak(WCU Biomodulation Major, Department of Agricultural Biotechnology, Seoul National University)