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Background   Launaea procumbens  (LP) has been used as a food supplement in Pakistan. In this study methanolic crude extract (LPME) of the whole plant and its different fractions; n-hexane (LPHE); ethyl acetate (LPEE) and chloroform (LPCE) were studied for the determination of total flavonoid and phenolics contents along with multifaceted  in vitro  scavenging assays.    Results  Considerable amount of flavonoid and phenolics contents were found in all the fractions. Methanol and chloroform fraction exhibited efficient scavenging of DPPH·, ABTS·+, ·OH, superoxide, lipid peroxide and nitric oxide free radicals. Significant correlation was found between DPPH·, ABTS·+, superoxide radical, β-carotene bleaching restraint and phosphomolybdenum assay with total flavonoids and phenolics contents. High performance chromatography (HPLC) of LPME revealed the presence of vitexin, orientin, rutin, hyperoside, catechin and myricetin.    Conclusion  These results reveal the presence of bioactive compounds in LPME, which might be contributed towards the various  in vitro  scavenging.

Assessment of flavonoids contents and in vitro antioxidant activity of Launaea procumbens