Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6592956 | Chinese Journal of Chemical Engineering | 2018 | 9 Pages |
Abstract
Biofabrication of noble monometallic platinum nanoparticles (Pt-NPs) and bimetallic gold-silver nanoparticles (AuAg-NPs) using aqueous extract of Delonix regia is presented here. Antioxidant activity of biomatrix-loaded metallic nanoparticles is estimated for scavenging of two model radicals i.e., 2,2â²-Azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt and 1,1â²-Diphenyl-2-picrylhydrazyl. Broad spectral continuum spanning from visible to ultra-violet region (Pt-NPs: 30 min) and broad high intensity absorption peak around at 500 nm (AuAg-NPs: 10 min) in two different UV-Visible spectra confirmed the biofabrication. Nanoparticles fabricated with distorted spherical shape and crystalline face-centred-cubic geometry. Strong signal around at 2.10 keV (pure-phase platinum) and typical X-ray peaks observed at 2.20 and 3 keV suggested, co-existence and alloying interaction of Au and Ag in AuAg-NPs. ζ potential (â 15.2 mV: Pt-NPs and â 13.9 mV: AuAg-NPs) values suggested surface adsorption of polyphenolic compounds to provide stability. Nanoparticles exhibited pronounced antioxidant activity against free radicals through their electron/hydrogen transfer ability.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Preeti Dauthal, Mausumi Mukhopadhyay,