Total Phenolic Content, Flavonoid Content and in vitro Antioxidant Activities of Dendrophthoe falcata (L.f.) Ettingsh

The total phenolic content(TPC) and total flavonoid content(TFC) of chloroform(CEDF), methanol(MEDF) and hydroalcoholic(HEDF) extracts of an Indian ayurvedic plant Dendrophthoe falcata (L.f) Ettingsh were measured using Folin-Ciocalteau and aluminum chloride colorimetric methods, respectively. The in vitro antioxidant activities were also investigated by using in vitro antioxidant models including 2,2´-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS + ), 1,1-diphenyl- 2-picrylhydrazyl(DPPH), nitric oxide(NO), hydroxyl radical(OH‾), super oxide(SO) and reducing power (Fe 3+ to Fe 2+ transformation) assay. The TPC were 21.78 ± 3.145, 38.66 ± 1.862 and 46.43 ± 2.55 mg gallic acid equivalents (GAE)/g extract, while TFC were 9.74 ± 1.324, 21.59 ± 1.09 and 33.42 ± 2.083 mg quercetin equivalents (QRT)/g extract sample for CEDF, MEDF and HEDF, respectively. Analysis of the free radical scavenging activities of the fractions revealed a concentration- dependent antiradical activity resulting from reduction of ABTS + , DPPH, NO, OH‾ and SO radicals to non-radical form. The scavenging activity of ascorbic acid, a known antioxidant used as positive control, was however higher and scavenging potential was in the order: ascorbic acid > HEDF > MEDF > CEDF. The reducing power of ascorbic acid, CEDF, MEDF and HEDF increased gradually with increasing concentration. The order of the reduction potential was ascorbic acid > HEDF > MEDF > CEDF. These results obtained in the present study indicate that D. falcata extracts can be a potential source of natural antioxidant with strong antiradical capacity.