In situ biosynthesis of Ag, Au and bimetallic nanoparticles using Piper pedicellatum C.DC: green chemistry approach.

The synthesis of Ag, Au and Ag-Au bimetallic nanoparticles using Piper pedicellatum C.DC leaf extract is demonstrated here. The rapid formation of stable Ag and Au nanoparticles has been found using P.

Antioxidant activities and total phenolic and flavonoid contents in three indigenous medicinal vegetables of north-east India.

Antioxidant activities of the n-hexane, ethyl acetate and methanol extracts of three indigenous leafy vegetables of north east India viz., Polygonum microcephallum, Oxalis corniculata and Portulaca oleraceae were measured by spectroscopic methods using the 1, 1-diphenyl-2-picrylhydrazyl (DPPH*) radical assay and xanthine/xanthine oxidase assay. The total phenolic and total flavonoid contents of each extract were also measured to assess their effect on the antioxidant activity.