不同采收期对广藿香产量及挥发油成分的影响

应用GC／MS联用技术分析比较了不同采收期对高要产广藿香的产量(平均单株干重)、含油率以及茎和叶中14个主要成分含量的影响。结果表明，11月份采收的全株含油率较高，与传统采收期相符。叶油中广藿香酮以7月和9月最高，以后逐渐降低，广藿香醇含量则以9～11月较高，其它月份相对较低；茎油中，广藿香酮含量以7月、10月和1月为高峰期，11月最低，而广藿香醇含量全年变化不显著，11月份之后含量较高。其它成分未显示其规律性变化。

Influence of Different Collection Time on Yield and Constituents of Essential Oil of Herba Pogostemonis from Gaoyao County

The constituents of the volatile oil of Herba Pogostemonis from Gaoyao county collected at various different time by GC/MS combination technology were analysed and compared. The results showed that the average dry weight of single plant (i.e. yield) increased gradually from July to next April, the content of volatile oil was highest in November.The contents of pogostemone in the leaf oil were higher in July and September,then decreased gradually with growth time; pachouli alcohol was higher in September, October and November,lower in other months.The contents of pogostmone in stem oil were higher in July,October and next January,lowest in November.The content change of pachouli alcohol in stem oil were not obvious in all growth time, higher slightly only after November. Other compounds were not showed their variation law. So the quality of Herba Pogostemonis collected in November was higher if the content of volatile oil was used as a standard of quality evaluation,the result was in accordance with traditional collection experience.