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<p>In this study, eco-friendly synthesis of Cu/CuO nanoparticles (Cu/CuO NPs) and Ag/Cu based composites was described. The leaf extract of <i>Dendrophthoe falcata</i> (<i>D. falcata</i>) which is rich in phenolic and flavonoid content was used as green reducing agent for Cu and Ag ions in aqueous solution. The biosynthesis of Cu/CuO NPs is an appealing alternative to physical and chemical approaches due to its low cost, simplicity, and environmental friendliness. Biosynthesized Cu/CuO NPs were characterized by UV–Visible spectroscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction (XRD), and transmission electron microscopy (TEM). Solid state UV–Visible analysis showed a broad band of absorption centered at 580&#xa0;nm for Cu/CuO NPs. Powder XRD analysis confirmed the presence of FCC Cu(0) phase in the sample along with oxides of Cu and the crystallite size of Cu/CuO was 15.8&#xa0;nm. Morphological analysis using TEM showed aggregated particles with size in range between 10–50&#xa0;nm. Additionally, Ag/AgO NPs and Ag/Cu based composites were prepared using <i>D. falcata</i> leaf extract. All three biosynthesized materials were tested for inhibitory activity against <i>Staphylococcus aureus</i>, <i>Bacillus thuringiencis</i>, <i>Escherichia coli</i>, and <i>Pseudomonas aeruginosa</i>. In this study, Ag/Cu based composites showed activity against microorganisms classified as gram negative (<i>Pseudomonas aeruginosa</i>) and gram positive (<i>Staphylococcus aureus</i> and <i>Bacillus thuringiencis</i>). In contrast, Cu/CuO and Ag/AgO NPs were active against only a single species of gram positive bacteria. In conclusion, the biosynthesis of Cu/CuO NPs and Ag/Cu based composites described in this work is facile and the synthesized materials have the potential to be developed into antibacterial compositions that fight infectious microbes in the future.</p>

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Green synthesis of mono and binary Cu-Ag based nanostructures using Dendrophthoe falcata leaf extract and evaluation of their antibacterial activities

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Srilakshmi P. Bhaskar,
  • K. Neethu

摘要

In this study, eco-friendly synthesis of Cu/CuO nanoparticles (Cu/CuO NPs) and Ag/Cu based composites was described. The leaf extract of Dendrophthoe falcata (D. falcata) which is rich in phenolic and flavonoid content was used as green reducing agent for Cu and Ag ions in aqueous solution. The biosynthesis of Cu/CuO NPs is an appealing alternative to physical and chemical approaches due to its low cost, simplicity, and environmental friendliness. Biosynthesized Cu/CuO NPs were characterized by UV–Visible spectroscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction (XRD), and transmission electron microscopy (TEM). Solid state UV–Visible analysis showed a broad band of absorption centered at 580 nm for Cu/CuO NPs. Powder XRD analysis confirmed the presence of FCC Cu(0) phase in the sample along with oxides of Cu and the crystallite size of Cu/CuO was 15.8 nm. Morphological analysis using TEM showed aggregated particles with size in range between 10–50 nm. Additionally, Ag/AgO NPs and Ag/Cu based composites were prepared using D. falcata leaf extract. All three biosynthesized materials were tested for inhibitory activity against Staphylococcus aureus, Bacillus thuringiencis, Escherichia coli, and Pseudomonas aeruginosa. In this study, Ag/Cu based composites showed activity against microorganisms classified as gram negative (Pseudomonas aeruginosa) and gram positive (Staphylococcus aureus and Bacillus thuringiencis). In contrast, Cu/CuO and Ag/AgO NPs were active against only a single species of gram positive bacteria. In conclusion, the biosynthesis of Cu/CuO NPs and Ag/Cu based composites described in this work is facile and the synthesized materials have the potential to be developed into antibacterial compositions that fight infectious microbes in the future.