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<p>Green synthesis of silver nanoparticles (AgNPs) is gaining significant attention due to their unique physicochemical characteristics and diverse applications. AgNPs can be synthesized using bacteria, yeast, plants, algae, fungi, microbial enzymes, etc. The present study focuses on the green synthesis of silver nanoparticles using <i>Spirulina platensis</i> (AgNP@SP). The formation of AgNPs was confirmed by a color change from green to red and by a surface plasmon resonance band observed at 420&#xa0;nm in the UV–visible spectrum. The synthesized silver nanoparticles were further characterized using FE-SEM, XRD, and FTIR, and EDX analysis. Their antibacterial and antifungal activities were evaluated against four different microbial strains. The presence of functional groups such as carbonyl (C = O) and carboxyl (COOH) on the nanoparticle surface was attributed to their antimicrobial activity. The presence of silver in AgNP@SP was confirmed by EDX analysis, which revealed silver and oxygen contents of 64% and 36%, respectively, indicating the predominance of silver. The crystalline nature of the nanoparticles was confirmed by XRD, showing strong diffraction peaks at 28.72°, 36.54°, 48.26°, 54.38°, 64.51°, and 77.31°. The antioxidant activity of the synthesized AgNPs was assessed using DPPH assay, and the results indicated moderate antioxidant potential, suggesting that nanoparticles may neutralize free radicals and protect against oxidative stress. Among the tested bacterial strains, <i>Pseudomonas aeruginosa</i> showed a maximum zone of inhibition (23&#xa0;mm), while <i>Staphylococcus aureus</i> exhibited a zone of inhibition 14.6&#xa0;mm. Overall, the green synthesized AgNPs using <i>S. platensis</i> extract demonstrated moderate antioxidant, antifungal, and antibacterial activity.</p>

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Antioxidant, Antibacterial and Antifungal Activities of Silver Nanoparticle Synthesized from Spirulina Platensis

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Anjali Yadav,
  • Mona Sharma,
  • Santosh Bhukal

摘要

Green synthesis of silver nanoparticles (AgNPs) is gaining significant attention due to their unique physicochemical characteristics and diverse applications. AgNPs can be synthesized using bacteria, yeast, plants, algae, fungi, microbial enzymes, etc. The present study focuses on the green synthesis of silver nanoparticles using Spirulina platensis (AgNP@SP). The formation of AgNPs was confirmed by a color change from green to red and by a surface plasmon resonance band observed at 420 nm in the UV–visible spectrum. The synthesized silver nanoparticles were further characterized using FE-SEM, XRD, and FTIR, and EDX analysis. Their antibacterial and antifungal activities were evaluated against four different microbial strains. The presence of functional groups such as carbonyl (C = O) and carboxyl (COOH) on the nanoparticle surface was attributed to their antimicrobial activity. The presence of silver in AgNP@SP was confirmed by EDX analysis, which revealed silver and oxygen contents of 64% and 36%, respectively, indicating the predominance of silver. The crystalline nature of the nanoparticles was confirmed by XRD, showing strong diffraction peaks at 28.72°, 36.54°, 48.26°, 54.38°, 64.51°, and 77.31°. The antioxidant activity of the synthesized AgNPs was assessed using DPPH assay, and the results indicated moderate antioxidant potential, suggesting that nanoparticles may neutralize free radicals and protect against oxidative stress. Among the tested bacterial strains, Pseudomonas aeruginosa showed a maximum zone of inhibition (23 mm), while Staphylococcus aureus exhibited a zone of inhibition 14.6 mm. Overall, the green synthesized AgNPs using S. platensis extract demonstrated moderate antioxidant, antifungal, and antibacterial activity.