Antioxidant activities and inhibitory effect of Taraxacum officinale, Cichorium intybus and Lectuca sativa on prooxidant induced lipid peroxidation in mice liver

This study reports the antioxidant and protective properties of three dietary plants, Taraxacum officinale, Cichorium intybus and Lectuca sativa on lipid peroxidation in mice liver. Extracts showed significant (p = 0.0392) inhibition against thiobarbituric acid reactive species (TBARS) induced using the pro- oxidants iron (10 μM FeSO4) and sodium nitroprusside (5 μM) in liver homogenates of mice. Free radical scavenging activity was evaluated by the quenching of DPPH radical (p=0.00236). Extracts also showed metal chelating activities (p=0.00143) and high antioxidant activity in phosphomolybdenum assay (p=0.00246). The high content (p=0.000243) of phenolics and flavonoids were detected in aqueous extracts of the plants which may be responsible for antioxidant activities. Taraxacum officinale comparatively showed higher antioxidant activities followed by Cichorium intybus and Lectuca sativa. It is concluded that polyphenolic-rich extracts of studied plants are potential sources of natural antioxidants

Antioxidant activities of aqueous extracts from nine different rose cultivars

Rose petals have been applied as food additives in teas, cakes and flavor extracts. The aim of this research study was to explore and reveal the antioxidant potential of aqueous extracts of rose petals belonging to nine genotypes of rose (wild as well as hybrid). The in vitro antioxidant activities of roses were studied by lipid peroxidation assay, DPPH radical scavenging assay, iron chelation assay, phosphomolybdenum reduction assay and total phenolic and flavonoid contents. The aqueous extract showed inhibition against lipid peroxidation (TBARS), induced by prooxidants (10 µM FeSO4) in mice liver homogenate. The free radical scavenging activities of the extracts were determined by scavenging of the DPPH radical. Extracts also showed metal chelating activities and high antioxidant activity in the phosphomolybdenum assay. The high content of phenolics and flavonoids detected in aqueous extracts may be responsible for the antioxidant activity. Amongst the different rose genotypes, screened, Rosa moschata (musk rose) was found to carry slightly higher antioxidant potential, owing to its higher phytochemical content