单萜类 ，由两个异戊二稀单元组成的萜类化合物，含10个碳原子。根据碳架的特点，主要分为无环单萜，许多单萜类化合物具有令人愉快的气味，是精油的主要成分。无环单萜可看作是2，6-二甲基辛烷的衍生物，多数在2-位有双键。
这些物质主要是倍半萜类、芳香族、单萜类等化合物。
Most of these compounds were sesquiterpenoids, aromatics and monoterpenoids.
讨论了单萜类物质在球果花蝇对寄主定位和产卵过程中的诱引或驱避作用。
The role of monoterpenes in cone fly host location and oviposition in terms of attractive signals or repellent is discussed.
而含氧单萜、含氧倍半萜类则正好相反，HD法所提挥发油中含氧萜类明显高于SCFE。
Relative contents of oxygenated monoterpene and sesquiterpene were higher in the oil isolated by HD than by SCFE.
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