方法：利用GC-MS气质联用仪对香附炮制前后的挥发油进行成分分析。
Methods: GC-MS machine was used to analyze the chemical composition in volatile oils.
方法采用GC - MS对挥发油进行成分分析。
Methods The volatile oils compositions was detected with GC-MS.
方法以水蒸气蒸馏法提取样品中挥发油，采用GC - MS联用技术对挥发油进行成分分析。
Methods Volatile oil was extracted from the sample by steam distillation, and its chemical components were analyzed and identified by GC-MS.
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