مقايسه ي اسانس و تغييرات ماده ي موثره منتول در گياه نعناع فلفلي (. Mentha.piperita L) در سه منطقه ي مختلف از استان كرمانشاه

Comparative studies of essential oil and menthol content of cultivated peppermint in three different regions of Kermanshah

Peppermint with scientific name of Mentha, piperita from Lamiaceae family is one of the medicinal and aromatic plants that its essential oil is used widely in medicinal, food, cosmetic and health industries. Peppermint cultivated in different regions of Iran. This research was aimed to investigate the identification and selection of suitable cultivation region and the effect of climate on essential oil and menthol content of peppermint in three different regions in Kermanshah. At suitable time, shoot of peppermint harvested and dried ,then volatile oil was extracted by stream distillation method. Volatile oil was analyzed by G.C and G.C/MS methods to identify and deter mine the menthol percent and another component. Result showed the change of amount essential oil and menthol contents. Change of menthol was in range 14.41-39.95 and essential oil was in range 2.26-3.41. This variation showed that essential oil and menthol content varied on different climatic condition, climatic condition affectod the qualityd and quantity essential oil in plant. Main components in three samples were menthol, menthone, pulegone, menthyl acetate and 1,8 cineole. Number of components varied in range 38-56. Karoacrol component was not in any samples of Kermanshah. This research showed that the sample of Sahneh has the highest quantity but the highest quality belongs to sample of Kermanshah. Sample of Ghilan gharb has the lowest of essential oil and the highest of menthone content that it is by reason of warmer climate.