Essential oils refer to the active components from natural products.
挥发油是天然产物中一类重要的活性成分。
The techniques of extraction and separation for active components from natural products are summarized, and the methods of extraction and chromatography are presented emphatically.
综述天然产物中活性成分的提取分离及分析技术，并着重对萃取技术、色谱技术进行论述。
Flavonoids is a kind of main active components in natural medicinal plants with many physiological functions.
黄酮类化合物是天然药用植物的主要活性成分之一，具有多种生理功能。
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