| Research Abstract |
1) For volatile-trapping, adsorbents should be chosen on the basis of their selective adsorption characteristics. Charcoal has wide adsorption capacity, but Tenax-GC is effecient for trapping in the adsorption of oxygenated terpenes and sesquiterpens. With Serial-trapping of Tenax-GC・Charcoal, terpene hydrocarbons, oxygenated terpenes and sesquiterpenes were fractionated.
2) The essential oil of Shiroyanagi Navel(Citrus sinensis OSBECK,cv. SHIROYANAGI) was prepared from the peel by Simultaneous distillation-extraction, and separated into fractions of hydrocarbon and oxygenated compounds. Sixty-eight compounds, including 9 hydrocarbons, 20 alcohols, 20 aldehydes, 9 esters, 2 phenols, 4 ethers, and 4 ketones, were identified by GC/MS and Kovats Indices.
3) Characteristic Flavor compounds were evaluated in the Shiroyanagi Navel. The most important flavor compounds were in oxygenated fraction, and evaluated by an omission test in the components. Octnal,nonanal,linalool, decanal, neral, geranial, dodecanal, <beta>-sinensal and <alpha>-sinensal were the most significant volatiles for the Shiroyanagi Navel. Also 93 volatile compounds were identified in the peel oil of Citrus sudachi.
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