Difenoconazole-Loaded Nanostructured Lipid Carriers: Preparation, Characterization, and Evaluation

Area of Science:

• Nanotechnology
• Drug Delivery Systems
• Agricultural Chemistry

Background:

• Difenoconazole (DFC) is a broad-spectrum fungicide with limited aqueous solubility, hindering its application.
• Nanostructured lipid carriers (NLCs) offer a promising approach to improve the delivery and efficacy of poorly soluble active ingredients.

Purpose of the Study:

• To develop and characterize difenoconazole-loaded nanostructured lipid carriers (DFC-NLCs).
• To evaluate the enhanced antifungal efficacy and safety profile of DFC-NLCs compared to commercial formulations against Rhizoctonia solani.

Main Methods:

• DFC-NLCs were prepared using the solvent diffusion method and characterized for physicochemical properties (particle size, zeta potential, encapsulation efficiency).
• Antifungal efficacy was assessed in vitro against Rhizoctonia solani, and drug uptake was visualized using fluorescence microscopy.
• Safety was evaluated in zebrafish through acute and developmental toxicity studies.

Main Results:

• DFC-NLCs were successfully prepared with nanometer-range particle sizes, high encapsulation efficiency, and spherical morphology.
• DFC-NLCs demonstrated significantly enhanced antifungal activity against R. solani compared to commercial DFC-EC and DFC-SC formulations, with lower EC50 values.
• Uptake studies confirmed effective DFC delivery into the pathogen, and DFC-NLCs exhibited a superior safety profile in zebrafish models.

Conclusions:

• Nanostructured lipid carriers provide an effective delivery system for improving the antifungal efficacy of difenoconazole.
• The DFC-NLC formulation offers enhanced target delivery, improved efficacy, and reduced environmental risks compared to conventional fungicide formulations.