Distillation extraction method is used for extracting the volatile constituents of the Herba Selaginellae. The average oil yield obtained is 2.85%.

报道了用水蒸汽蒸馏萃取法提取卷柏中挥发性物质，测得卷柏挥发油的含量为2.85%。

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Walnut oil obtained by three extraction methods was researched on the yield, physicochemical properties, content of total flavone and unsaturated fatty acid.

研究了三种提取方法对核桃油得率、理化性能、总黄酮含量、不饱和脂肪酸含量的影响。

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Objective: To establish the relationship equation of yield and extraction time of plant volatile oil.

目的：建立植物挥发油提取量与提取时间关系式。

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