中文摘要：

目的分析藏荆芥Nepeta angustifolia C.Y.Wu不同药用部位及荆芥Schizonepeta tenuifalia Briq中的挥发性成分,并比较其差异。方法取藏荆芥全草、花穗、叶、茎和荆芥,分别密封于顶空进样瓶中,顶空气相色谱-质谱联用（HS-GC/MS）法测定挥发性成分,并检索NIST标准谱库,面积归一化法计算其相对含有量。结果藏荆芥的挥发性成分种类以叶中最多（21个）,而全草中最少（17个）。茎中主要为荆芥内酯,相对含有量达73.24%。荆芥中鉴定出18个挥发性成分,主要为异薄荷酮、胡薄荷酮和柠檬烯。结论藏荆芥与荆芥中的挥发性成分存在较大差异。

英文摘要：

AIM To analyze the volatile constituents in different medicinal parts of Nepeta angustifolia C. Y.Wu and Schizonepeta tenuifalia Briq and to compare their differences. METHODS The whole grass,spikes,leaves and stems of N. angustifolia and S. tenuifalia were sealed in the headspace bottle and analyzed by headspace gas chromatography-mass spectrometry（ HS-GC / MS）. The NIST library was searched. Then the relative contents of them were calculated by area normalization method. RESULTS The kinds of volatile constituents in N. angustifolia were the most in leaves（ twenty-one） and the least in whole grass（ seventeen）. Stems mainly contained nepetalactone with the relative content of 73. 24%. There were eighteen volatile constituents in S. tenuifalia,mainly of which were menthone,pulegone and cinene. CONCLUSION There are significant differences in the volatile constituents in N. angustifolia and S. tenuifalia.