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<p>Valorizing agro-wastes into carbon dots (CDs) converts biomass into versatile nanomaterials, fostering sustainability and enabling advanced applications in fields like packaging and food safety. Guava leaf carbon dots (GL-CDs) were prepared by hydrothermal method and characterized. Transmission electron microscopic and particle size analyses revealed that the size of GL-CDs was &lt; 10&#xa0;nm. When subjected to UV light, the color of GL-CDs changed from yellowish-brown to blue and exhibited adaptable photoluminescence characteristics. Due to hydrothermal effect, functional groups and interaction of GL-CDs slightly differed from guava leaf powder as observed from FTIR spectra. The highest UV-A (33.80%), UV-B (79.80%) and UV-C (97.63%) barrier properties were obtained in GL-CDs at 100&#xa0;µg/mL. Antioxidant activities as tested by different assays increased with augmenting levels of GL-CDs. In both β-carotene/linoleic acid and lecithin liposome model systems, GL-CDs retarded the lipid oxidation more effectively than ascorbic acid. GL-CDs showed an excellent antibacterial activity against the selected Gram-positive and Gram-negative bacteria. Therefore, GL-CDs could be used as potential additive in food or incorporated in packaging known as active packaging.</p>

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Synthesis and Characterization of Carbon Dots from Guava Leaves (Psidium guajava L.): UV Blocking, Antioxidant and Antimicrobial Functions

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Gokulprasanth Murugan,
  • Krisana Nilsuwan,
  • Jun Tae Kim,
  • Jong-Whan Rhim,
  • Bin Zhang,
  • Tao Yin,
  • Soottawat Benjakul

摘要

Valorizing agro-wastes into carbon dots (CDs) converts biomass into versatile nanomaterials, fostering sustainability and enabling advanced applications in fields like packaging and food safety. Guava leaf carbon dots (GL-CDs) were prepared by hydrothermal method and characterized. Transmission electron microscopic and particle size analyses revealed that the size of GL-CDs was < 10 nm. When subjected to UV light, the color of GL-CDs changed from yellowish-brown to blue and exhibited adaptable photoluminescence characteristics. Due to hydrothermal effect, functional groups and interaction of GL-CDs slightly differed from guava leaf powder as observed from FTIR spectra. The highest UV-A (33.80%), UV-B (79.80%) and UV-C (97.63%) barrier properties were obtained in GL-CDs at 100 µg/mL. Antioxidant activities as tested by different assays increased with augmenting levels of GL-CDs. In both β-carotene/linoleic acid and lecithin liposome model systems, GL-CDs retarded the lipid oxidation more effectively than ascorbic acid. GL-CDs showed an excellent antibacterial activity against the selected Gram-positive and Gram-negative bacteria. Therefore, GL-CDs could be used as potential additive in food or incorporated in packaging known as active packaging.