4.7 Article

NIR laser-activated polydopamine-coated Fe3O4 nanoplatform used as a recyclable precise photothermal insecticide

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出版社

ELSEVIER
DOI: 10.1016/j.susmat.2022.e00456

关键词

Polydopamine-coated Fe3O4 nanoplatform; Pesticide-free; Precise photothermal insecticide; Intestinal bacteria; Environmental friendliness

资金

  1. National Natural Science Foundation of China [81572028]
  2. Youth Outstanding Reserve Talents Program of Shandong First Medical University
  3. Shandong Academy of Medical Sciences

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A NIR laser-activated pesticide-free nanoplatform was developed for precise photothermal killing of housefly larvae, demonstrating excellent biocompatibility and environmental friendliness.
Chemical pesticides are widely used in prevention and control of pests. However, low insecticidal efficacy, high environmental risks and pesticidal resistance severely constrain further applications. In this study, a near-infrared (NIR) laser-activated pesticide-free Fe3O4@PDA nanoplatform was constructed for precise photothermal killing of housefly larvae. The polydopamine (PDA) surface-functionalized Fe3O4 nanoparticles (Fe3O4@PDA NPs) were synthesized by simply mixing dopamine with Fe3O4 NPs under aerobic alkaline conditions. These Fe3O4@PDA NPs exhibited superb photothermal performance with NIR laser irradiation. Larval uptake results revealed greater in vivo uptake of Fe3O4@PDA NPs than bare Fe3O4 NPs when housefly larvae were fed a NP-treated diet. These NPs exhibited favorable biocompatibility and showed no obvious influence on larval development and intestinal microbial population. However, when irradiated with a NIR laser, the NPs efficiently induced death of housefly larvae with high temperature (T-max > 50 degrees C) damage to the intestinal wall and subsequent leakage of intestinal bacteria into the hemocoel. Furthermore, uneaten NPs can be collected by magnetic separation and show excellent thermal stability, which allowed recycling of these environmentally friendly nanoparticles. The Fe3O4-based nanoparticles integrate the independence of pesticides, pronounced photothermal control of pests, and environmental friendliness, making this nanoplatform promising for controlling vector pests and diseases.

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