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<p>This study investigated the green synthesis of Ag/Bi<sub>2</sub>O<sub>3</sub> and Ag/Bi<sub>2</sub>O<sub>3</sub>-curdlan nanocomposites utilizing an aqueous extract of <i>Sargassum latifolium</i>. The optical, physicochemical, and morphological properties of the nanocomposites were studied using UV-visible spectroscopy, FTIR, Zeta potential, DLS, HR-TEM, SEM, EDX, and XRD techniques. Phytochemical analysis of <i>S. latifolium</i> extract revealed the presence of polyphenols (102.96 ± 1.57&#xa0;mg GAE/g dry extract), flavonoids (41.58 ± 1.88&#xa0;mg QE/g dry extract), and tannins (58.56 ± 1.49&#xa0;mg TAE/100&#xa0;g dry weight). The antioxidant activity, evaluated using the DPPH assay, demonstrated that <i>S. latifolium</i> extract exhibited the highest activity (IC<sub>50</sub> = 0.069 ± 1.11&#xa0;mg/mL), followed by Ag/Bi<sub>2</sub>O<sub>3</sub> NC (IC<sub>50</sub> = 0.282 ± 1.08&#xa0;mg/mL) and Ag/Bi<sub>2</sub>O<sub>3</sub>-curdlan NC (IC<sub>50</sub> = 1.228 ± 1.27&#xa0;mg/mL). Antibacterial activity against a panel of Gram-positive and Gram-negative bacteria revealed that Ag/Bi<sub>2</sub>O<sub>3</sub>-curdlan nanocomposites exhibited considerably improved activity compared to <i>S. latifolium</i> extract and Ag/Bi<sub>2</sub>O<sub>3</sub> NC. Notably, Ag/Bi<sub>2</sub>O<sub>3</sub>-curdlan NC displayed the most potent activity against <i>E. coli</i> with an inhibition zone of 17.0 ± 1.13&#xa0;mm, surpassing the inhibition zone of gentamicin against <i>S. typhimurium</i> and <i>K. pneumoniae</i> (13.0&#xa0;mm). These findings highlight the potential of <i>S. latifolium</i> extract for the green synthesis of Ag/Bi<sub>2</sub>O<sub>3</sub>-curdlan nanocomposites with enhanced antibacterial and antioxidant properties. This eco-friendly approach holds promise for the development of novel and effective antimicrobial agents with potential applications in various fields.</p>

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Harnessing the Potential of Sargassum Latifolium for Sustainable Synthesis of Ag/Bi2O3-Curdlan Nanocomposites: Phytochemical Characterization and Biological Applications

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Ibtisam Mousa,
  • Abdulrhman M. Alsharari,
  • Adel I. Alalawy,
  • Awatif R. Z. Almotairy,
  • Salwa Aljohani,
  • Raha Osailan,
  • Wael M. Alamoudi,
  • Nashwa M. El-Metwaly,
  • Nashwa El-Metwal

摘要

This study investigated the green synthesis of Ag/Bi2O3 and Ag/Bi2O3-curdlan nanocomposites utilizing an aqueous extract of Sargassum latifolium. The optical, physicochemical, and morphological properties of the nanocomposites were studied using UV-visible spectroscopy, FTIR, Zeta potential, DLS, HR-TEM, SEM, EDX, and XRD techniques. Phytochemical analysis of S. latifolium extract revealed the presence of polyphenols (102.96 ± 1.57 mg GAE/g dry extract), flavonoids (41.58 ± 1.88 mg QE/g dry extract), and tannins (58.56 ± 1.49 mg TAE/100 g dry weight). The antioxidant activity, evaluated using the DPPH assay, demonstrated that S. latifolium extract exhibited the highest activity (IC50 = 0.069 ± 1.11 mg/mL), followed by Ag/Bi2O3 NC (IC50 = 0.282 ± 1.08 mg/mL) and Ag/Bi2O3-curdlan NC (IC50 = 1.228 ± 1.27 mg/mL). Antibacterial activity against a panel of Gram-positive and Gram-negative bacteria revealed that Ag/Bi2O3-curdlan nanocomposites exhibited considerably improved activity compared to S. latifolium extract and Ag/Bi2O3 NC. Notably, Ag/Bi2O3-curdlan NC displayed the most potent activity against E. coli with an inhibition zone of 17.0 ± 1.13 mm, surpassing the inhibition zone of gentamicin against S. typhimurium and K. pneumoniae (13.0 mm). These findings highlight the potential of S. latifolium extract for the green synthesis of Ag/Bi2O3-curdlan nanocomposites with enhanced antibacterial and antioxidant properties. This eco-friendly approach holds promise for the development of novel and effective antimicrobial agents with potential applications in various fields.