Dimeric Prodrug Self-Assemblies Based on Carfentrazone with High Herbicidal Activity and Low Risks to Environment

Area of Science:

• Agricultural Chemistry
• Materials Science
• Nanotechnology

Background:

• Pesticide utilization needs improvement for efficacy and environmental safety.
• Self-assembly offers a novel strategy for developing advanced pesticide formulations.
• Current formulations may involve harmful adjuvants and have suboptimal delivery.

Purpose of the Study:

• To create self-assembling dimeric prodrugs of carfentrazone (CAR) into nanoparticles (CP NPs).
• To investigate the relationship between linker structure and nanoparticle properties.
• To evaluate the herbicidal efficacy and environmental safety of the developed CP NPs.

Main Methods:

• Synthesis of four dimeric prodrugs by conjugating carfentrazone with alkyl diols or dithiol.
• Formation of carfentrazone prodrug nanoparticles (CP NPs) via noncovalent self-assembly.
• Characterization of CP NP size and evaluation of herbicidal activity and crop/soil safety.

Main Results:

• CP NPs were successfully formed without harmful adjuvants.
• Nanoparticle size correlated inversely with linker carbon chain length and was influenced by linker type (dithiol vs. diol).
• CP NPs demonstrated superior herbicidal activity compared to commercial carfentrazone and showed safety for wheat and maize seedlings without impacting soil enzyme activity.

Conclusions:

• Self-assembly of dimeric prodrugs is an effective strategy for creating efficient and environmentally benign pesticide nanoparticles.
• The developed CP NPs offer enhanced physicochemical properties leading to improved herbicidal performance.
• This approach presents a promising pathway for sustainable agriculture by increasing pesticide efficacy and reducing ecological risks.