Isolation and Characterization of Flavonoids and Oils from Some Saudi Plants and Their Biological Activity

Abstract

Palm pollen were macerated with aqueous ethanol at room temperature . Fractionation of the ethyl acetate extract of palm pollen over silica gel column followed by a Sephadex column gave two compounds(I and II) classified as flavonoids. The structures of these flavonoids were elucidated by a combination of spectral techniques: (UV, 1HNMR and MS). These isolates were assigned the following tentative structures:

Compound I

Compound II Fixed oils were extracted from three medicinally important species: Lepidium sativum , Nigella sativa and Peganum harmala grown in Saudi Arabia. The constituents of the oils were identified and quantified by GC-MS analysis . In cup plate agar diffusion bioassay the target oils were evaluated for antimicrobial potential and different antimicrobial responses were observed.