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<p>The study investigates the green synthesis of silver nanoparticles (AgNPs) using <i>Calathea ornata</i> extract and their potential applications. GC–MS analysis revealed 18 phytocomponents, including ethanol, propanoic acid 2,2-dimethyl-phenylmethyl ester, and methoxyacetyl chloride, contributing to the extract's antimicrobial properties. FTIR spectroscopy indicated the involvement of carbonyl and hydroxyl groups in the reduction and stabilization of AgNPs. UV–Visible spectroscopy confirmed the formation of AgNPs with a surface plasmon resonance peak shift from 462 to 480&#xa0;nm. Dynamic light scattering (DLS) and TEM analysis demonstrated uniform particle sizes ranging from 20 to 50&#xa0;nm with high monodispersity. The AgNPs exhibited significant antibacterial activity, with a 99.99% reduction rate against <i>Staphylococcus aureus</i> and a 97% reduction rate against <i>Escherichia coli</i>. Cytotoxicity tests on HeLa cells showed a dose-dependent decrease in cell survival, with an IC<sub>50</sub> value of approximately 935&#xa0;µg/ml. The findings highlight the potential of green-synthesized AgNPs for antimicrobial applications with reduced environmental impact.</p> Graphical abstract <p></p>

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Green synthesis of silver nanoparticles using Calathea ornata extract: Characterization, antimicrobial properties, and cytotoxicity assessment

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Mahfuza Tahsin Shoily,
  • Maliha Mumtaj  Hossain,
  • Shohag Chandra Das,
  • Sultana Bedoura

摘要

The study investigates the green synthesis of silver nanoparticles (AgNPs) using Calathea ornata extract and their potential applications. GC–MS analysis revealed 18 phytocomponents, including ethanol, propanoic acid 2,2-dimethyl-phenylmethyl ester, and methoxyacetyl chloride, contributing to the extract's antimicrobial properties. FTIR spectroscopy indicated the involvement of carbonyl and hydroxyl groups in the reduction and stabilization of AgNPs. UV–Visible spectroscopy confirmed the formation of AgNPs with a surface plasmon resonance peak shift from 462 to 480 nm. Dynamic light scattering (DLS) and TEM analysis demonstrated uniform particle sizes ranging from 20 to 50 nm with high monodispersity. The AgNPs exhibited significant antibacterial activity, with a 99.99% reduction rate against Staphylococcus aureus and a 97% reduction rate against Escherichia coli. Cytotoxicity tests on HeLa cells showed a dose-dependent decrease in cell survival, with an IC50 value of approximately 935 µg/ml. The findings highlight the potential of green-synthesized AgNPs for antimicrobial applications with reduced environmental impact.

Graphical abstract