Abstract
Mesoporous silica nanoparticles (MSN) are widely used as pesticide carriers to enhance their effective utilization, since it can promote the solubility and absorption of pesticides by plants. For plants, the particle size of pesticides influences their absorption and efficacy. Herein, is our research work of the size effect of MSN on the loading, release, and delivery behavior of pyraoxystrobin (Pyr) in cucumber plants. The well-ordered Pyr-loaded carbon quantum dots-MSN (Pyr@M) with sizes of 15, 100, and 200 nm were prepared. A comparative study among different particle sizes of Pyr@M was carried out on the aspects of control release performance, loading content, uptake, and transportation performance in cucumber plants. It was found that the loading content increased as the particle size increased. The nanoparticles as carriers increased the solubility of insoluble Pyr, but the nanoparticle size had no clear difference impact on the release rate. The efficiency of the cellular uptake strongly depended on the particle size. The smaller the MSN size, the easier it was to be absorbed and transmitted by cucumber plants. Compared to the free Pyr, the upward transportation rate of Pyr from Pyr@M in plant increased by 3.5 times. These findings provide new theoretical basis to design the MSN pesticide delivery system.
Highlights
Due to the serious ecological and environmental problems caused by the extensive use of pesticides, the world faces a serious pressure and challenge of reducing application and increasing effective utilization of pesticide
Statistical analysis showed that the average particle size of carbon loading,dots-mesoporous silica nanoparticles (MSN)
The results showed that the lowest detected concentration (LOD) of Pyr in the cucumber plants and the roots matrix was 0.1 μg/kg, and the lowest added level was used to determine the quantitative limit (LOQ)
Summary
Due to the serious ecological and environmental problems caused by the extensive use of pesticides, the world faces a serious pressure and challenge of reducing application and increasing effective utilization of pesticide. The use of nanotechnology in crops is increasing, one of the applications is the study of controlled release of pesticides and another important is to promote uptake and transport [1,2]. Particle size is one of the most important factors that endow nanomaterials with special physical, chemical, as well as biological properties, bringing a wide range of promising applications [3]. Pesticides can be transported across biological membranes through passive diffusion or ion-trapping mechanisms, the primary way to improve the transmission performance is to increase membrane permeability by optimizing the physical and chemical properties of the active ingredients. There ar studies on the size effect of nanoparticles on pesticide loading, release, and de plant
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