Optimization and characterization of lambda‐cyhalothrin solid nanodispersion by self‐dispersing method

Wang, Chunxin; Cui, Bo; Zhao, Xiang; Wang, Yan; Zeng, Zhanghua; Sun, Changjiao; Yang, Dong-Sheng; Liu, Guoqiang; Cui, Haixin

doi:10.1002/ps.5122

Cited by 19 publications

(15 citation statements)

References 35 publications

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“…Since the formed bifenazate particles were small and stable (Figure C), the particle size of BS tended to be stable after 2 h, and its mean particle size was smaller than that of spirodiclofen at 24 h (Figure A,E). The mean particle size of the BS nanodispersion was larger than that of the solid nanodispersion (<100.0 nm), but the size was less than that of the nanodispersion prepared by the wet milling process (233.0 nm) . It was noted that the mean particle size of spirodiclofen increased to 371.8 nm within 24 h, but it was still less than 500 nm and could be used as a nanopesticide.…”

Section: Resultsmentioning

confidence: 95%

“…Five surfactants commonly used in pesticides were selected to study their effects on nanodispersion preparation (Figure ). Particle size and PDI were two key evaluation indices of the nanodispersion. , PDI is used to describe the degree of nonuniformity of the particle size distributions. For nanoparticle formulations, an acceptable PDI value was 0.300 and below .…”

Section: Resultsmentioning

confidence: 99%

“…The statistical mean particle size of 51 particles in the TEM image was from 50.0 to 145.7 nm (Figure B), which was smaller than the size obtained by the Zetasizer Nano ZS 90. This was because the particle observed by TEM was in a dry state, while the particle size measured by Zetasizer Nano ZS 90 was hydrodynamic size …”

Section: Resultsmentioning

confidence: 99%

“…Besides, friction heat in the process would lead to high temperature and aggregation of particles, which is not suitable for pesticides with a low melting point . Bottom-up methods involve controlled precipitation, self-emulsifying, followed by solidification, etc. − The controlled precipitation, which have many influencing factors, need to precisely control the particle size growth . Self-emulsifying followed by solidification method is a simple and energy-efficient process, but it requires removal and recycle of organic solvents, which would inevitably increase the operation steps and energy consumption .…”

Section: Introductionmentioning

confidence: 99%

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Simple, Effective, and Energy-Efficient Strategy to Construct a Stable Pesticide Nanodispersion

Zhang

Gao

et al. 2021

ACS Agric. Sci. Technol.

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Nanopesticides have great impetus for enhancing the efficacy and safety of pesticides. Developing a simple and effective preparation method and controlling nanoparticle size growth during nanopesticides storage are still great challenges. In this paper, a new strategy was adopted to successfully construct nanodispersions. That is, pesticide was stored as soluble concentrate (SL), and the nanodispersion was formed by diluting with water when use. As an example, bifenazate-spirodiclofen (BS) complex SL was prepared and stable at 0 ± 2 and 54 °C ± 2 °C during 14-day storage. The mean particle size of the BS nanodispersion was less than 220 nm after standing for 24 h. The wettability and acaricidal activity of the BS nanodispersion were better than that of commercial SC. The universality of the strategy was also validated by bifenazate, spirodiclofen, abamectin, and difenoconazole. The strategy to construct a stable pesticide nanodispersion is simple, effective, and energy-efficient, which will promote the development of nanopesticides.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simple, Effective, and Energy-Efficient Strategy to Construct a Stable Pesticide Nanodispersion

Zhang

Gao

et al. 2021

ACS Agric. Sci. Technol.

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“…For each ratio, the PDI was below 0.3, which implied good nanocapsules' dispersity [51]. The use of surfactant combinations showed the potential to yield nanocapsules with smaller particle size and better physical stability [52].…”

Section: Complex Surfactantsmentioning

confidence: 96%

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

et al. 2020

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The prevention and control of pests and diseases are becoming increasingly difficult owing to extensive pesticide resistance. The synergistic use of pesticides for disease control is an effective way of slowing pesticide resistance, reducing the number of pesticide applications, and protecting the environment. In this study, a dual-functionalized pesticide nanocapsule delivery system loaded with two active ingredients (AIs)—validamycin and thifluzamide—was developed to prevent and control rice sheath blight; the nanocapsule system was based on a water–oil–water double emulsion method combined with high-pressure homogenization technology. Our results showed that the dual-functionalized pesticide nanocapsules were monodisperse spheres with a mean particle size of ~260 nm and had good storage stability. Compared with commercial formulations, the dual-functionalized pesticide nanocapsules exhibited good foliar spread owing to their small size, which is beneficial for reducing the loss of pesticides on the leaves. The 50% median effect concentration and synergistic ratio against Rhizoctonia solani of the dual-functionalized pesticide nanocapsules and commercial formulation were 0.0082 and 0.0350 μg/mL, and 2.088 and 0.917, respectively. These findings indicate that the bioactivity of the dual-functionalized system was significantly better than that of the commercial formulations and that the dual-functionalized system demonstrated a clear synergistic effect between the two AIs. The system presented here is simple, fast, and capable of dual-pesticide loading with significant synergistic effects. Our findings could help to facilitate the improvement of pesticides efficiency and the slowing of pesticide resistance.

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Preparation and characterization of a novel controlled‐release nano‐delivery system loaded with pyraclostrobin via high‐pressure homogenization

Wang

Cui

Wang

et al. 2020

Pest Management Science

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BACKGROUNDThe development of efficient and safe green pesticides is a scientific strategy to alleviate current pesticide residues, environmental pollution, and threats to non‐target organisms. Pesticide controlled‐release formulations (CRFs) have attracted wide attention because they can control the rate of release of active ingredients and prolong the effective duration. In particular, nanoscale pesticide sustained‐release systems have excellent biological activity and distribution performance because of their small particle size. Some technical difficulties remain in obtaining nanoscale CRFs.RESULTSWe successfully fabricated pyraclostrobin nanosphere CRF by combining high‐pressure homogenization technology and emulsion–solvent evaporation methods. The pyraclostrobin nanospheres had a uniform spherical shape with a mean particle size of 450 nm and polydispersity index of less than 0.3. The pyraclostrobin loading capacity reached 53.6%, with excellent storage stability. The contact angle of nanospheres on cucumber leaf surfaces demonstrated that it had good wettability. Compared with pyraclostrobin technical and commercial formulations, the nanosphere systems showed a significantly sustained release of pyraclostrobin for longer (up to 250 h). A preliminary bioassay against Penicillium ochrochloron showed that the bioactivity and long‐term efficiency of pyraclostrobin nanospheres were superior to those of the commercial formulation.CONCLUSIONThis research introduced a simple, fast, expandable method for preparing pyraclostrobin nanospheres. The results showed that pyraclostrobin nanospheres could prolong the duration of pesticide efficacy and enhance bioactivity. Furthermore, this technology provides a platform for scale‐up production of nano‐scale pesticide CRFs. © 2020 Society of Chemical Industry

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Optimization and characterization of lambda‐cyhalothrin solid nanodispersion by self‐dispersing method

Abstract: Therefore, lambda-cyhalothrin solid nanodispersion has broad application prospects in agricultural production and environmental protection. © 2018 Society of Chemical Industry.

Cited by 19 publications

References 35 publications

Simple, Effective, and Energy-Efficient Strategy to Construct a Stable Pesticide Nanodispersion

Simple, Effective, and Energy-Efficient Strategy to Construct a Stable Pesticide Nanodispersion

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

Preparation and characterization of a novel controlled‐release nano‐delivery system loaded with pyraclostrobin via high‐pressure homogenization

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