Preparation, characterization and antifungal activity of pyraclostrobin solid nanodispersion by self‐emulsifying technique

Abstract

BACKGROUND Pathogenic fungi are the causal agents of 70–80% of plant diseases. Therefore, it is imperative to explore new and high effective fungicides. Constructing nanoscale fungicides using nanomaterial and nanotechnology has attracted wide attention in recent years. RESULTS In this research, a pyraclostrobin solid nanodispersion (PSND) was prepared using the self‐emulsifying method. The solid nanodispersion had a mean particle size of 20 nm and a zeta potential of ‐29.3 mV. The solubility and dissolution rate of the PSND increased owing to the decrease in particle size and the actions of the surfactants. The contact angle and retention volumes of the PSND on cucumber and cabbage leaf surfaces were greater than those of the commercial water dispersible granule. In addition, the median lethal concentration against Fusarium oxysporum was 0.7 43 µg mL−1. The toxicity of the nanoparticles was 4.5 times that of the water dispersible granule (WDG). The high fungicidal activity of PSND promoted the production of excess reactive oxygen species (ROS). The activity levels of the antioxidant enzymes containing superoxide dismutase (SOD) and catalase (CAT) decreased in F. oxysporum. CONCLUSION The research introduced a new method for preparing insoluble pyraclostrobin solid nanoformulation for fungicides to enhance the fungicidal activity and reduce environmental pollution. © 2019 Society of Chemical Industry

Dual-Functionalized Pesticide Nanocapsule Delivery System with Improved Spreading Behavior and Enhanced Bioactivity

“…According to these data, the prepared nanocapsules showed no clear advantage compared with other groups. This observation is likely due to the fact that no additives such as sizing and spreading agent were added to the preparation of dual-functionalized pesticide nanocapsules [56]. However, the ESEM images clearly show that the commercial formulations were spread on the leaf surface in patches, whereas the dual-functionalized pesticide nanocapsules were scattered on the leaf surface as uniform spheres.…”

A Facile Approach to Increasing the Foliage Retention of Pesticides Based on Coating with a Tannic Acid/Fe3+ Complex

“…In each experiment, an aliquot of approximately 8 µL of the pesticide solution was dropped onto the leaf using an automated micro-drop injector, and photographic images were acquired after the drop stabilized by the imaging system. The angle data were collected via ellipsometry based on analyses of these images [41,42]. Each solution was used for 10 replicate measurements.…”

Zoxamide accumulation and retention evaluation after nanosuspension technology application in tomato plant

“…[29][30][31][32][33][34][35][36][37][38][39][40][41] Besides, the number of literature data regarding nanosuspension technology in the agrochemical field is limited. Nanosuspension formulations of pyrethroid, strobilurin and avermectin compounds have been prepared in the last decade, [42][43][44][45][46][47][48][49] However, no ZO nanosuspension has been prepared or studied before. Moreover, no data have been found in the literature concerning nanocrystals pesticide residues deposition and bioavailability on vegetables.…”