Comparative Studies on Volatile Oil Components of Mentha haplocalyx from Different Regions in China

In this study the essential oil compositions in Mentha haplocalyx Briq.from 4 different regions(Yunnan, Guangxi,Jiangsu and Hebei Province) in China were determined by headspace GC-MS.The results showed that a total of 85 kinds of substances were detected among which alkene,alcohol and ketones are the dominant components.The sample from Jiangsu had a composition of pinene(11.10%),d-limonene(42.30%) and pulegone (25.50%);The sample from Guangxi had a composition of carvone(25.46%),d-limonene(28.75%) and eucalyptol (14.91%);The sample from Yunnan had a composition of pinene(22%),d-limonene(18.45%) and eucalyptol (16.96%) which is similar to the composition of the sample from Hebei with pinene(23%) and d-limonene (33.33%) and eucalyptol(12.45%).Conclusively,the composition of the volatile oil in M.haplocalyx was highly dependent on the regional habitat condition.M.haplocalyx in Jiangsu had relatively high content of pulegone while that in Guangxi had high content of carvone.Samples from Yunan and Hebei had similar oil compositions but different proportions of each kind of oil.