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<p>In this research, gold nanoparticles (AuNPs) were produced through an environmentally friendly approach, utilizing a methanol-based extract derived from orange peels, a plentiful and sustainable fruit byproduct. The synthesized AuNPs were comprehensively characterized using UV-Vis, XRD, FT-IR, DLS, and TEM techniques. The optimum synthesis conditions were established by evaluating the influence of precursor concentration, reaction temperature, and time. The synthesized powder displayed a FCC crystal arrangement, with an average size of 28.7&#xa0;nm, and a spherical shape, as verified through TEM analysis. The antibacterial performance of the biosynthesized AuNPs was assessed on six bacterial strains, showing strong strain-specific inhibition, particularly against Gram-positive bacteria, with a minimum inhibitory concentration (MIC) of 62.5&#xa0;µg/mL against <i>S. aureus</i>. Moreover, their photocatalytic potential was demonstrated through the efficient degradation of rhodamine b and methyl orange under UV irradiation, with maximum degradation efficiencies of 94.3% and 89.3%, respectively. The AuNPs also exhibited good reusability over five cycles with minimal loss of activity. These results illustrated the potential of orange peel-based AuNPs as effective, low-cost nanomaterials for environmental remediation and antibacterial applications and offering a promising alternative to conventional chemical synthesis routes.</p>

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Eco-Engineered Gold Nanoparticles as Dual-Functional Nanoplatforms for Microbial Inhibition and Organic Dyes Photodegradation

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Zirar M. Mizwari

摘要

In this research, gold nanoparticles (AuNPs) were produced through an environmentally friendly approach, utilizing a methanol-based extract derived from orange peels, a plentiful and sustainable fruit byproduct. The synthesized AuNPs were comprehensively characterized using UV-Vis, XRD, FT-IR, DLS, and TEM techniques. The optimum synthesis conditions were established by evaluating the influence of precursor concentration, reaction temperature, and time. The synthesized powder displayed a FCC crystal arrangement, with an average size of 28.7 nm, and a spherical shape, as verified through TEM analysis. The antibacterial performance of the biosynthesized AuNPs was assessed on six bacterial strains, showing strong strain-specific inhibition, particularly against Gram-positive bacteria, with a minimum inhibitory concentration (MIC) of 62.5 µg/mL against S. aureus. Moreover, their photocatalytic potential was demonstrated through the efficient degradation of rhodamine b and methyl orange under UV irradiation, with maximum degradation efficiencies of 94.3% and 89.3%, respectively. The AuNPs also exhibited good reusability over five cycles with minimal loss of activity. These results illustrated the potential of orange peel-based AuNPs as effective, low-cost nanomaterials for environmental remediation and antibacterial applications and offering a promising alternative to conventional chemical synthesis routes.