Composition of essential oil, antioxidant activity and pheniol and flavonoied content of different part of Postia puberula at post flowering stage

In this study, the essential oil composition, flavonoid and phenolic contents, and antioxidant activities of metanolic extract of stems, leaves and fruits in Postia puberula at post flowering stage were determinated. Essential oils were analyzed by using GC and GC/MS, The antioxidant activity were measured by 2, 2-diphenyl-1-picrylhydrazyl and β-carotene/linoleic acid assay, also phenol and flavonoid content were measured by gallic acid and quercetin as standard compound. Result showed that cadinol (13.30%), hexenyl benzoate (12.06%) and caryophyllene oxide (11.96%) were the main compuned found in the leaves while; the stems were rich of cis-3-hexenyl benzoate (7.07), hexadecanic acid (5.75%) and δ-cadinol(5.71), also the major compouned of fruits were nuciferol (8.98%), benzyl benzoate (7.39%) and hexenyl benzoate (6.55%). In both DPPH and β-carotene/linoleic acid tests the leaves have stronger antioxidant activity compare with other organes, also, the results demonstrated that the leaves have more flavonoid and phenolic contents than the others