Antioxidant activity of phytosynthesized biomatrix-loaded noble metallic nanoparticles

doi:10.1016/j.cjche.2017.12.014

Abstract

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., 2,2'-Azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt and 1,1'-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 (-15.2 mV:Pt-NPs and -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.

Key words: Platinum, Gold-silver, Nanoparticles, Antioxidant, Free radical

摘要： 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., 2,2'-Azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt and 1,1'-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 (-15.2 mV:Pt-NPs and -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.

关键词: Platinum, Gold-silver, Nanoparticles, Antioxidant, Free radical

Preeti Dauthal, Mausumi Mukhopadhyay. Antioxidant activity of phytosynthesized biomatrix-loaded noble metallic nanoparticles[J]. Chin.J.Chem.Eng., 2018, 26(5): 1200-1208.

Preeti Dauthal, Mausumi Mukhopadhyay. Antioxidant activity of phytosynthesized biomatrix-loaded noble metallic nanoparticles[J]. Chinese Journal of Chemical Engineering, 2018, 26(5): 1200-1208.

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