Enhanced and sustained pesticidal activity of a graphene‐based pesticide delivery system against the diamondback moth Plutella xylostella

Abstract

Background Traditional abamectin (Abm) formulations have several shortcomings, such as low water solubility, burst release behavior, poor photostability, and short persistence periods, which decrease their pesticidal activity and the risks they pose to the environment. Nanomaterial‐based pesticide delivery systems (PDSs) provide new strategies for the efficient and safe application of pesticides. Here, we developed Abm‐loaded graphene oxide (Abm/GO) as a PDS for the sustained release of Abm, which shows enhanced control efficacy against Plutella xylostella. Results The hydrophobic Abm molecule was effectively loaded on GO nanocarrier by a physisorption method, which formed a uniform and stable Abm/GO nanoformulation. GO possesses high adsorption capacity and can effectively load Abm. The Abm/GO nanoformulation shows enhanced water dispersion stability and can remain stable during a 2‐year storage period in contrast to the water‐insoluble Abm. In addition, the Abm/GO nanoformulation exhibits sustained pesticide release behavior and possesses significantly improved anti‐ultraviolet properties. Thus, the Abm/GO nanoformulation shows superior pesticidal activity compared with Abm. Abm/GO showed negligible toxicity to maize seedlings, and its GO nanocarrier can reduce the cytotoxicity of Abm to A549 cells. Conclusion GO‐based PDSs can effectively overcome the disadvantages of traditional pesticides, such as their insolubility, burst release behavior, instability, and short persistence period. GO shows much future promise in agriculture in light of its industrialization potential. © 2022 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

Preparation and Characterization of Insecticide/Calix[4]arene Complexes and Their Enhanced Insecticidal Activities againstPlutella xylostella

“…6,7 Especially, the development of functional materials as synergists that help to improve the bioactivity, stability, utilization rate, and duration of pesticides has attracted increasing attention due to the feasibility and low R&D cost. 8−10 Various types of materials have been reported to have synergistic effects for pesticides, which include metal nanoparticles, 11 graphene oxide, 12 mesoporous silica nanoparticles, 13 polymers, 14 etc. The improved efficacy was majorly achieved by the controlled releasement, increased stability, and higher permeability, which consequently reduced the pesticide residue in the environment.…”

“…Therefore, the development of highly efficient pest-control methods that can reduce pesticide usage is of great importance. Many strategies have been applied to achieve the purpose, such as the discovery of new bioactive compounds − and the optimization of formulations by developing new synergetic adjuvants. , Especially, the development of functional materials as synergists that help to improve the bioactivity, stability, utilization rate, and duration of pesticides has attracted increasing attention due to the feasibility and low R&D cost. − Various types of materials have been reported to have synergistic effects for pesticides, which include metal nanoparticles, graphene oxide, mesoporous silica nanoparticles, polymers, etc . The improved efficacy was majorly achieved by the controlled releasement, increased stability, and higher permeability, which consequently reduced the pesticide residue in the environment. ,, …”

Redox/Near-Infrared Dual-Responsive Hollow Mesoporous Organosilica Nanoparticles for Pesticide Smart Delivery

“…To date, because of their nanoscale size and targeted release, nanotechnology-based pesticide delivery systems were the most widely investigated as a candidate strategy to solve these problems . Many materials were designed as nanocarriers, including mesoporous silica nanoparticles (MSNs), hollow mesoporous silica nanoparticles (HMSNs), nanogels, polymers, − carbon materials, , and graphene oxide, , which could protect pesticides and improve their delivery to some extent. Nevertheless, there are still some limitations in the nanopesticide field that need to be overcome, for instance, complex preparation procedures, high production costs, and environmental pollution caused by nanocarriers …”