Inter and intra GC-MS differential analysis of the essential oils of three Mentha species growing in Egypt

Identification of the chemical components of the studied essential oils depends on their retention time, their Kovat retention index and their mass spectrum supported by the data from Wiley library. Results obtained revealed an obvious inter or intra differences in the chemical composition of the three mentioned Mentha species. The common components in all species (in one or more organ) are 35 components, the major of which is P-menthone (32.24%) in Mentha piperita leaf. Regarding the unique components it was found that Mentha piperita contain 7 unique components the major of which is 2,4-(10)-thujadien (3.88%), while Mentha spicata has 18 unique components the major one is Cymene (24.44%) and finally Mentha pulegum has 11 unique components the major one is (+)-Isomenthol (16.64%).