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<p>In recent years, active packaging based on nanofibers that enables on-demand release of antimicrobial agents has attracted significant attention. However, traditional systems responsive to pH or enzymes demand direct contact between nanofibers and fruit to trigger antimicrobial release, limiting their practical use as they cannot easily cover individual fruits, risking microbial growth in non-contact zones. This study introduces a novel light-responsive antimicrobial packaging material, THY@PLA/CuS-LA, consisting of porous PLA nanofibers loaded with thymol (THY), embedded with Copper(II) sulfide (CuS) nanoparticles, and further coated with a thermos responsive lauric acid (LA) layer. Under NIR light, this design enables non-contact, on-demand release of the antimicrobial agent THY. SEM and TEM confirmed the successful incorporation of CuS nanoparticles and THY. Upon exposure to near-infrared (NIR) light, the CuS nanoparticles heated the nanofibers to 41.7&#xa0;°C, triggering the phase transition of the LA coating and releasing THY. The nanofibers exhibited NIR-triggered, "on–off" controlled release of THY. Antimicrobial assays revealed enhanced antibacterial activity upon NIR activation, with inhibition zones increasing by 29.2% for <i>E. coli</i> (from 23.3 ± 1.0&#xa0;mm to 30.1 ± 0.8&#xa0;mm) and 72.5% for <i>S. aureus</i> (from 32.0 ± 0.9&#xa0;mm to 55.2 ± 2.9&#xa0;mm), indicating a superior on-demand antimicrobial response. Strawberry preservation trials showed that the group exposed to intermittent NIR light had no visible spoilage after 5&#xa0;days. This study demonstrates the successful development of NIR-responsive nanofiber films for controlled release of antimicrobial agents, offering a promising solution for fresh fruit preservation without direct contact.</p>

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Light-Triggered thymol release from phase-change lauric acid-coated porous nanofibers for active packaging

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Mengyao Yang,
  • Xiangyu Jiao,
  • Haiyu Du,
  • Xiaona Chong,
  • Guotao Liu,
  • Zhu Zhu,
  • Yongqiang Wen

摘要

In recent years, active packaging based on nanofibers that enables on-demand release of antimicrobial agents has attracted significant attention. However, traditional systems responsive to pH or enzymes demand direct contact between nanofibers and fruit to trigger antimicrobial release, limiting their practical use as they cannot easily cover individual fruits, risking microbial growth in non-contact zones. This study introduces a novel light-responsive antimicrobial packaging material, THY@PLA/CuS-LA, consisting of porous PLA nanofibers loaded with thymol (THY), embedded with Copper(II) sulfide (CuS) nanoparticles, and further coated with a thermos responsive lauric acid (LA) layer. Under NIR light, this design enables non-contact, on-demand release of the antimicrobial agent THY. SEM and TEM confirmed the successful incorporation of CuS nanoparticles and THY. Upon exposure to near-infrared (NIR) light, the CuS nanoparticles heated the nanofibers to 41.7 °C, triggering the phase transition of the LA coating and releasing THY. The nanofibers exhibited NIR-triggered, "on–off" controlled release of THY. Antimicrobial assays revealed enhanced antibacterial activity upon NIR activation, with inhibition zones increasing by 29.2% for E. coli (from 23.3 ± 1.0 mm to 30.1 ± 0.8 mm) and 72.5% for S. aureus (from 32.0 ± 0.9 mm to 55.2 ± 2.9 mm), indicating a superior on-demand antimicrobial response. Strawberry preservation trials showed that the group exposed to intermittent NIR light had no visible spoilage after 5 days. This study demonstrates the successful development of NIR-responsive nanofiber films for controlled release of antimicrobial agents, offering a promising solution for fresh fruit preservation without direct contact.