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www.nature.com/scientificreports/ Scientific RepoRtS | Vol:.(1234567890) Figure 3. Characterization of the synthesized silver nanoparticles (AgNPs) at the optimum conditions, (a) FTIR spectrum of AgNPs, (b) size distribution by intensity using light scattering technique, (c) XRD pattern, (d) SEM image of AgNPs at magnification power × 480,000, (e) SEM image of AgNPs at magnification power × 160,000, (f) SEM image of AgNPs at magnification power × 960,000. polyphenols and flavonoids were carried out for the previous samples. It was found that the best characteristics of the AgNPs were synthesized by the aid of the polyphenols rich fraction (ethyl acetate fraction). The ethyl acetate fraction was standardized using UPLC-PDA-UV method with reference to the major phe- nolic compound that was isolated from the fraction itself; which was found to be ellagic acid. The fraction was further analysed by an LC–MS–MS method that revealed tentative identification of 23 polyphenols for the first time in the leaves of pomegranate grown in Egypt (Table 1). Many studies before mentioned the role of plant polyphenols in the green synthesis of AgNPs. For example, the phenolic extracts obtained from Bilberry and Red Currant waste extracts were found to produce AgNPs with a hydrodynamic diameter of 25–65 nm26. Jigyasa and Rajput (2018) promoted the green synthesis of AgNPs for colorimetric detection of melamine in milk using different bio-polyphenols such as rutin and curcumin27. More specifically, gallic acid and quercetin mediated the synthesis of silver and bimetallic (silver and selenium) nanoparticles with antimicrobial and antitumor activities28,29. More importantly, ellagic acid was not only has (2020) 10:14851 | https://doi.org/10.1038/s41598-020-71847-5 6PDF Image | pomegranate leaves and their role in green silver nanoparticles
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