Ecological Requirements, Antioxidant Activity and New Chemotype Essential Oil from Achillea millefolium L. and Achillea micrantha Wild. in North of Iran (Golestan Province)

In many field observation, ecological equipment, phenology and ethnopharmacological data of Achillea millefolium L. and A. micrantha Wild. were studied. The inflorescences of plants were collected in different locations of Golestan province: Chaharbagh (۲۰۰۰ m) and Dozan (۲۲۰۰ m) respectively. Essential oils were obtained by steam distillation (Clevenger) and analyzed by gas chromatography-mass spectrometry and (GC-MS). Total phenol (TP) and total flavonoid (TF) were determined with spectro photo meteri. Antioxidant properties were obtained by three radical scavenging activity methods: reducing power (RP), total antioxidant capacity (TAC) and ۲,۲-Diphenyl-۱-picrylhydrazyl (DPPH). Field observation showed that both species of Achillea are perennial aromatic plants which can grow ۳۰ to ۷۰ cm tall, flowers appeared in mid to late of May where the annual average rainfall were ۳۹۹-۳۴۵ mm, in sandy loam to silty clay loam soil. These plants has been used in traditional medicine as antibacterial, anti infection ,anti spasm, sedative, astringent, anti nociceptive and wound healing. Flowers essential oils of A. millefoilum and A. micrantha were characterized by higher amounts of similar constituents: binapacryle (۶۳.۸۲%ˏ ۸۳.۶۳%), ۱-۸ cineol (۱۴.۹۷%ˏ ۳.۷۶%) and α-selinene (۴.۸۱%ˏ ۴.۴۹%) respectively. TP content (۱۲.۳۴±۰.۲۶۴ to ۱۸.۴۴±۰.۰۸۵ mgGAEgr-۱)and TF contents (۶۱.۰۰۳±۲.۳۸ to ‎۸۰.۳۰±۵.۷۹۳ mgQUE g-۱) were measured in A. micrantha and A. millefolium, respectively. A. micrantha had more antioxidant activity with IC۵۰ (۰.۱۸۴±۰.۰۴۷۵ ‎µg/ml in dry weight in DPPH method) than A. millefolium (IC۵۰ ‎۰.۱۷۸±۰.۱۷۸ µg/ml in dry weight in RP method). According to the results, there is a positive correlation between antioxidant activity and important secondary metabolites (TP, TF), this could help to study more about the application of these plants in traditional medicine as an antiseptic, anti spasm and antibacterial agent.

Keywords:

A. millefolium L , A micrantha Wild , Autecology , essential oil , TF , TP , antioxidant capacity , Golestan Province , Iran