Fig. 1From: Chemical composition analysis of the essential oil of Mentha piperita L. from Kermanshah, Iran by hydrodistillation and HS/SPME methodsThe comparative diagram of the main essential oil constituents of Mentha piperita L. by HS/SPME and hydrodistillation methods of this study and the previous studies (Ref. (Rohloff 1999) and (Moradi and Najafian 2015)) in this plantBack to article page