ABTS

Present study was design to investigated In vitro antioxidant activity of hydroethanolic (HEETF), methanolic (METF) and aqueous extracts (AQETF) of Thalictrum foliolosum family-Ranuculacaece. Traditionally used for jaundice, antimalarial, antipyretic, Diuretics, dyspepsia and febrifuge was found in scientific literature. The antioxidant activity (AA) was determined by the possible four complementary test assay methods namely total phenolic content, total flavonoid content, Inhibition of  2,2 diphenyl -1 picrylhydrazyl (DPPH) radicals and ABTS (2-2’- azinobis) radical scavenging activity or quenching activity .Total phenolic content were found in HEETF, METF and AQETF 43.64±24.2, 53.64± 32.8 and 55.82±30.6 respectively, result shows as mg/GAE/ g of extract. Total flavonoid content  were found in HEETF, METF and AQETF 25.43±31.3, 33.42± 29.3 and 42.67±31.8 respectively, result shows as mg/Rutin /g of extract.  In DPPH radical scavenging activity, IC50 value were found in HEETF, METF and AQETF 4.270µg/ml, 4.90 µg/ml and 5.170 µg/ml respectively, in ABTS 2-2’- azinobis radical scavenging activity value were found in HEETF, METF and AQETF  3.35µg/ml, 3.58µg/ml and  4.86 µg/m respectively. The present study revealed that hydroethanolic extract shows significant Antioxidant, Thus it provides a platform for further research, it could be a potential candidate for further drug development

A novel antioxidant oxochromen derivative was isolated and characterized from Thespesia populnea stem bark (Linn.) with the evaluation of its in vitro antioxidant activity. The isolated compound was characterized by FTIR, 1H NMR, 13C NMR, and mass spectral technique. The spectral data revealed the structure [(2S,3R,4S,5S,6R)-2-(5,7-dihydroxy-2-methyl-4-oxochromen-6-yl)-4,5-dihydroxy-6-(hydroxyl methyl) oxan-3-yl] 3,4,5-trihydroxybenzoate. Antioxidant activity of the isolated compound was evaluated by DPPH scavenging activity, ABTS scavenging activity and Ferric reducing /antioxidant power assay. Results show that isolated compound from the acetone extract fraction of T. populnea stem bark exhibit better antioxidant activity at lower concentration in all the methods and at higher concentrations they act as prooxidants. In conclusion the present results suggested that the isolated compound could be a potential antioxidant agent for preparing functional foods and nutraceuticals applied in food and pharmaceutical industries.