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7918950 
Journal Article 
Biogenic synthesis of silver nanoparticles and their antioxidant and antibacterial activity 
Bhakya, S; Muthukrishnan, S; Sukumaran, M; Muthukumar, M 
2016 
Springer Nature 
6 
5 
755-766 
English 
WOS:000376541600015 
Nanomedicine utilizes biocompatible nanomaterials for diagnostic and therapeutic purposes. The present study reports the use of Helicteres isora root extract for the synthesis of silver nanoparticles (AgNPs). The synthesized AgNPs were initially noticed through visual color change from yellow to reddish brown and further confirmed by surface plasmonic resonance (SPR) band at 450 nm using UV–visible spectroscopy. Morphology and size of AgNPs were determined by transmission electron microscopy (TEM) analysis. X-ray diffraction (XRD) study revealed crystalline nature of AgNPs. The prolonged stability of AgNPs was due to capping of oxidized polyphenols and carboxyl protein which was established by Fourier transform infrared spectroscopy (FTIR) study. In addition, the synthesized AgNPs were tested for antioxidant and antibacterial activities. It showed good antioxidant activity as compared to butylated hydroxytoluene (BHT) and ascorbic acid as standard antioxidant. It could be concluded that H. isora root extract can be used efficiently in the production of potential antioxidant and antibacterial AgNPs for commercial application. © 2015, The Author(s). 
Green synthesis; Silver nanoparticles; Helicteres isora; antioxidant; Antibacterial; TEM & FTIR