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<p>As a kind of widely available agricultural waste, the utilization of coffee grounds has garnered significant interest for developing sustainable functional nanomaterials aimed at enhancing food preservation and quality. In this study, nanoparticles (NPs) derived from coffee grounds were synthesized with chitosan (CS) via a hydrothermal method. Structural analysis indicated that the nanoparticles (NPs) comprised carbonaceous architectures with a negatively charged surface and exhibited stable fluorescence properties across a pH range of 4 to 8. The optical properties of the CS-NPs were found to remain consistent with those of the pristine NPs. Furthermore, the CS-NPs exhibited synergistically enhanced antioxidant and anti-yeast activities compared with CS alone, even surpassing free NPs. The composite material significantly increased the leakage of intracellular substances, mainly nucleic acids and proteins. Moreover, the clarification transmittance of wine treated with CS‑NPs exhibited a concentration-dependent behavior, and the turbidity-causing components could be effectively precipitated, making CS-NPs an attractive option for beverage clarification.</p>

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Preparation and Structural Characterization of Chitosan-Coffee Ground-Based Nanocomposites: Antioxidant, Antimicrobial, and Wine Clarification

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Siqi Wang,
  • Yueling Wu,
  • Ying Lu,
  • Hongbo Ling,
  • Jialei Shi,
  • Yingjie Du,
  • Le Zhong,
  • Xunyu Song

摘要

As a kind of widely available agricultural waste, the utilization of coffee grounds has garnered significant interest for developing sustainable functional nanomaterials aimed at enhancing food preservation and quality. In this study, nanoparticles (NPs) derived from coffee grounds were synthesized with chitosan (CS) via a hydrothermal method. Structural analysis indicated that the nanoparticles (NPs) comprised carbonaceous architectures with a negatively charged surface and exhibited stable fluorescence properties across a pH range of 4 to 8. The optical properties of the CS-NPs were found to remain consistent with those of the pristine NPs. Furthermore, the CS-NPs exhibited synergistically enhanced antioxidant and anti-yeast activities compared with CS alone, even surpassing free NPs. The composite material significantly increased the leakage of intracellular substances, mainly nucleic acids and proteins. Moreover, the clarification transmittance of wine treated with CS‑NPs exhibited a concentration-dependent behavior, and the turbidity-causing components could be effectively precipitated, making CS-NPs an attractive option for beverage clarification.