オシメン

解説

C10H16(136.23)．非環式モノテルペン．オシメンは，シソ科メボウキOcimum basilicum，そのほかの芳香をもつ精油に含まれている．"1,3,6位に二重結合のあるβ形と，1,3,7位に二重結合のあるα形があり，また，それぞれについて3位の二重結合につき，シス，トランスの異性体がある．通常，α,βそれぞれは，シス，トランスの混合物である．　cis-α形　　n²⁰_D 1.4789，λmax 235 nm(ε 21600)．　cis-β形　　n²⁰_D 1.4877，λmax 238 nm(ε 21000)．　trans-α形　n²⁰_D1.4802，λmax 231 nm(ε 27300)．　trans-β形　n²⁰_D 1.4893，λmax 232 nm(ε 27600)．

森北出版「化学辞典（第2版）

説明

β-Ocimene is a monoterpene that has been found in a variety of plants and is a volatile compound involved in plant-plant signaling and plant defense against pests. It is emitted by tea (C. sinensis) plants in response to a jasmonic acid combined with mechanical damage (JAMD) model of herbivore attack. β-Ocimene reduces the number of winged aphids (M. persicae) that settle on Chinese cabbage and the feeding time and number of nymphs produced by aphids on leaves. The aphid endoparasitoid A. gifuensis demonstrates a preference for β-ocimene-treated Chinese cabbage over control plants in a wind tube two-choice test. β-Ocimene (100-1,000 ppm) also has antioxidant activity in a thiobarbituric acid reactive substances (TBARS) assay.

化学的特性

3,7-Dimethyl-1,3,6-octatrine has a warm herbaceous odor.

天然物の起源

Reported found in black currants, currant leaves, mentha pulegium oil, origanum oil, passion fruit, citrus peel oils, guava, strawberry jam, cinnamon bark, Thymus vulgaris, hop oil, tea, soybean, parsnips, tarragon, origanum, Ocimum basilicum, curcuma, ouzo and pimento berry