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Peer-reviewedCC BY-NC-ND 4.0ACS Omega

PDA-CeO2 Functionalized Pickering Microcapsules with Enhanced Foliar Retention and UV Stability for Efficient Pesticide Delivery

  • Wenneng Wu1
  • Shuhui Hu1
  • Qin Li1
  • Bo Zhang2
  • Lin-Lin Yang1
  1. 1Guiyang University , , ,
  2. 2Shanghai Normal University , , 100 Guilin Road , ,
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Abstract

Pesticide spraying applications often encounter challenges such as inadequate foliar deposition, low retention, and rapid photodegradation, which can significantly impact pesticide utilization. Microencapsulation of pesticides offers a viable solution to these issues. In this study, we encapsulated pyraclostrobin (PYR) within polydopamine-CeO2 modified polyurea microcapsules (PYR@PDA-CeO2–PU MCs) using Pickering emulsion interfacial polymerization. The PDA-modified CeO2 nanoparticles (PDA-CeO2 NPs) acted as the primary emulsifier and ultraviolet (UV) absorber, providing enhanced adhesion, controlled release, and UV protection. The PYR@PDA-CeO2–PU MCs demonstrated an encapsulation efficiency of 82.22 ± 2.00% and a loading capacity of 41.00 ± 1.50%, with a release profile consistent with the Higuchi model. The incorporation of PDA significantly improved leaf retention and adhesion, while the covalent attachment of PDA-CeO2 to the PU shell enhanced the photostability of PYR. After 72 h of UV irradiation, PYR@PDA-CeO2–PU MCs achieved a retention rate of 82.55 ± 0.80%, compared to 74.82 ± 0.44% for Seltima and 53.11 ± 0.91% for PYR TC. In vivo tests on rice and kiwifruit leaves demonstrated superior protective and curative effects, while toxicity assessments indicated reduced toxicity to zebrafish compared to PYR TC. In conclusion, the PDA-CeO2 functionalized PU MCs exhibit remarkable foliar retention and UV stability, thereby enhancing the practical application of pesticides.

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Cite

BibTeXRIS
BibTeX
@article{wu2026pdaceo2,
  title = {{PDA-CeO2 Functionalized Pickering Microcapsules with Enhanced Foliar Retention and UV Stability for Efficient Pesticide Delivery}},
  author = {Wenneng Wu and Shuhui Hu and Qin Li and Bo Zhang and Lin-Lin Yang},
  journal = {ACS Omega},
  year = {2026},
  month = oct,
  doi = {10.1021/acsomega.6c04595},
  url = {https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c04595/5458639/PDA-CeO2-Functionalized-Pickering-Microcapsules},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - JOUR
TI  - PDA-CeO2 Functionalized Pickering Microcapsules with Enhanced Foliar Retention and UV Stability for Efficient Pesticide Delivery
AU  - Wenneng Wu
AU  - Shuhui Hu
AU  - Qin Li
AU  - Bo Zhang
AU  - Lin-Lin Yang
PY  - 2026
DA  - 2026/10/27
JO  - ACS Omega
DO  - 10.1021/acsomega.6c04595
UR  - https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c04595/5458639/PDA-CeO2-Functionalized-Pickering-Microcapsules
AB  - Pesticide spraying applications often encounter challenges such as inadequate foliar deposition, low retention, and rapid photodegradation, which can significantly impact pesticide utilization. Microencapsulation of pesticides offers a viable solution to these issues. In this study, we encapsulated pyraclostrobin (PYR) within polydopamine-CeO2 modified polyurea microcapsules (PYR@PDA-CeO2–PU MCs) using Pickering emulsion interfacial polymerization. The PDA-modified CeO2 nanoparticles (PDA-CeO2 NPs) acted as the primary emulsifier and ultraviolet (UV) absorber, providing enhanced adhesion, controlled release, and UV protection. The PYR@PDA-CeO2–PU MCs demonstrated an encapsulation efficiency of 82.22 ± 2.00% and a loading capacity of 41.00 ± 1.50%, with a release profile consistent with the Higuchi model. The incorporation of PDA significantly improved leaf retention and adhesion, while the covalent attachment of PDA-CeO2 to the PU shell enhanced the photostability of PYR. After 72 h of UV irradiation, PYR@PDA-CeO2–PU MCs achieved a retention rate of 82.55 ± 0.80%, compared to 74.82 ± 0.44% for Seltima and 53.11 ± 0.91% for PYR TC. In vivo tests on rice and kiwifruit leaves demonstrated superior protective and curative effects, while toxicity assessments indicated reduced toxicity to zebrafish compared to PYR TC. In conclusion, the PDA-CeO2 functionalized PU MCs exhibit remarkable foliar retention and UV stability, thereby enhancing the practical application of pesticides.
SN  - 2470-1343
ER  -