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722 S.N. Kharat, V.D. Mendhulkar / Materials Science and Engineering C 62 (2016) 719–724 Fig. 5. Nanoparticle tracking analysis graph for AgNPs. 5. Results and discussion The present study deals with the green synthesis of silver nano- particles, their characterization and assessment of antioxidant activity. The silver nanoparticles were synthesized using fresh leaves of medici- nal plant E. scaber. The plants are an excellent source of important secondary metabolites of medicinal importance compared to bacteria and fungi, their by providing greater scope for the production of bio- compatible nanoscale particles. The mechanism of formation of AgNPs using E. scaber leaf extract is figured below which indicates the reaction path of the process for the synthesis of AgNPs in the presence of sunlight. Further, it shows the biological reduction of silver salt and the formation of AgNPs with surface capping of plant metabolite con- stituents (Fig. 3). The findings are discussed below. 5.1. UV–Vis spectroscopy The size dependent optical characterization of reducing Ag+ ions in E. scaber was determined by Shimazdu-1800 spectrophotometer, there- by confirming the formation of phytonanoparticles. The UV–Vis spectra Fig. 7. X-ray diffraction profile of AgNPs in E. scaber. of E. scaber leaf extract were also determined and it shows the stable absorbance at 320 nm (Fig. 4a). The UV–Vis absorbance of sample material was monitored from 1 min to 10 min on immediate addition of AgNO3 in the leaf extract, in the presence of sunlight (Fig. 4b). The sta- bility was accessed up to 30 min but it was observed that the rate of syn- thesis of AgNPs was enhanced from 3 min to 9 min and it was gradually declined after 10 min. A UV–Vis spectrum of the plant leaf extract reac- tion mixtures showed an absorption peak at around 440 nm. The posi- tion of the absorption peak depends on the particle size and shape [18]. The time dependent shift in the peak of absorbance indicated the initiation of reaction and synthesis of AgNPs in bulk amount. 5.2. NTA analysis NTA analysis reveals that information regarding concentration, distribution and size of nanoparticles in studied sample of E. scaber. The mean size of synthesized nanoscale particles was observed as 78 nm. The concentration of phytoreduced nanoparticle as recorded by NTA is 44.53 particles/frame, 1.66 × 108 particles/ml. The size Fig. 6. TEM images (a) 100 nm and (b) SAED of AgNPs in E. scaber.PDF Image | Antioxidant activity of Silver Nanoparticles using leaf extract
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