Analysis of Particle Size Regulating the Insecticidal Efficacy of Phoxim Polyurethane Microcapsules on Leaves

Luo, Jian; Huang, Xueping; Jing, Tong-fang; Zhang, Da-xia; Li, Beixing; Liu, Feng

doi:10.1021/acssuschemeng.8b04567

Cited by 52 publications

(58 citation statements)

References 29 publications

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“…Nevertheless, there was no direct correlation between the transport efficiency of EB@PGA and the degree of functionalization. The results illustrated that NPs with 260–360 nm could be transported through phloem tissue, a size consistent with those reported in the literature 38 . PGA nanocarriers could effectively improve phloem transport of EB in the flowering cabbage.…”

Section: Resultssupporting

confidence: 89%

Targeted delivery of emamectin benzoate by functionalized polysuccinimide nanoparticles for the flowering cabbage and controlling Plutella xylostella

Liu

Zhao

et al. 2021

Pest Management Science

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BACKGROUND Plutella xylostella, one of the most destructive and cosmopolitan pests of cruciferous crops, is especially harmful to the young tissues of the flowering cabbage (Brassica campestris L.). Although emamectin benzoate (EB) has high insecticidal activity against P. xylostella, one major reason of low utilization for EB is the lack of internal transport in the young plants. RESULTS In this study, four kinds of functional EB/polysuccinimide (PSI) with glycine methylester nanoparticles (EB@PGA NPs) were prepared. The obtained EB@PGA NPs could effectively protect EB from photolysis, and the degradation rate of EB@PGA NPs was <30% in 24 h. Simulating the intestinal pH = 9 of P. xylostella, the highest cumulative release rate of EB@PGA NPs could reach 89.61% in 24 h. Furthermore, EB@PGA NPs could delivery EB into the young tissues of the flowering cabbage through the nanocarrier, and the highest transport efficiency of EB@PGA25 reached 1.437%. The bioactivity of EB@PGA25 against P. xylostella larvae (LC50 = 0.34 μg mL−1) was 1.6‐fold higher than that of EB (LC50 = 0.53 μg mL−1). EB@PGA could easily become ‘internalized’ into the intestinal wall of P. xylostella, thus increasing the penetration of the drug and enhancing the insecticidal activity. CONCLUSION The accurate delivery of insecticides by PGA nanocarriers into young tissues of plants could be a promising new method for the efficient management of field pests and diseases. © 2021 Society of Chemical Industry.

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Section: Resultssupporting

confidence: 89%

Targeted delivery of emamectin benzoate by functionalized polysuccinimide nanoparticles for the flowering cabbage and controlling Plutella xylostella

Liu

Zhao

et al. 2021

Pest Management Science

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“…Stomachtoxicity refers to that the pesticide enters the body through the mouthparts of pest and exerts its activity during the feeding process [ 31 ]. However, the limited life of active ingredients, which results in the failure to reach the larval intestine efficiently and to be absorbed by pest [ 33 ]. Mechanism research of contact toxicity and stomachtoxicity of PthII@HKUST-1 was shown in scheme Fig.…”

Section: Resultsmentioning

confidence: 99%

Sustainable nano-pesticide platform based on Pyrethrins II for prevention and control Monochamus alternatus

et al. 2022

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Background Pine wilt disease as a devastating forest disaster result from Bursaphelenchus xylophilus that spread by stem-borers Monochamus alternatus feeding on pine leaves, which has brought inestimable economic losses to the world's forestry due to lack of effective prevention and control measures. In this paper, we put forward a proposal for utilizing nanoHKUST-1 to encapusulate the Pyrethrins II that a nerve agent extracted from plant to control M. alternatus, including toxicity mechanism research, traceable biopesticide monitoring, and environment assessment for the first time. The highly biocompatible nanoHKUST-1 can solve the problems of poor water solubility, easy degradation and low control efficiency of Pyrethrins II. Results The results illustrated the biopesticide loading efficiency of PthII@HKUST-1 reached 85% and the cumulative release of pH-dependent PthII@HKUST-1 was up to 15 days (90%), and also effectively avoid photodegradation (pH 7.0, retention 60.9%). 50 nm PthII@HKUST-1 made it easily penetrate the body wall of MA larvae and transmit to tissue cells through contact and diffusion. Moreover, PthII@HKUST-1 can effectively enhance the cytotoxicity and utilization of Pyrethrins II, which will provide valuable research value for the application of typical plant-derived nerve agents in the prevention and control of forestry pests. PthII@HKUST-1 as an environmentally friendly nano-pesticide can efficiently deliver Pyrethrins II to the larval intestines and absorbed by the larvae. PthII@HKUST-1 could also be transmitted to the epidemic wood and dead wood at a low concentration (10 mg/L). Conclusion Here we speculate that nanoHKUST-1 will bring new opportunity to research biopesticide inhibition mechanism of different agricultural and forestry pests, which will break through the existing research limitations on development, utilization and traceable monitoring of biopesticide, especially for the study of targeting specific proteins. Graphical Abstract

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“…The transport efficiency of THI@BSA·NPs inside the larvae was tested according to a previously reported method with modifications [ 41 ]. The THI@BSA·NPs diluent solution (0.2 mL) at a concentration of 500 μg/mL was added into artificial feed (2 g), and the feed was put into a breeding box.…”

Section: Methodsmentioning

confidence: 99%

Self-assembled bovine serum albumin nanoparticles as pesticide delivery vectors for controlling trunk-boring pests

Liu

Cao

et al. 2020

J Nanobiotechnol

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Background Trunk-boring pests (TBPs) are an important type of forest pest, TBPs not only feed on the branches and trunks of trees, but also spread quarantine diseases in forests. However, because the larvae of TBPs live inside the trunk and are well concealed, prevention and control are difficult. The lack of effective control methods leads to the death of many trees in forests. In this study, a novel nanopesticide featuring high bioactivity and slow-release properties was developed to control TBPs. Thiacloprid (THI), which is commonly used to control Coleoptera species, was used as a model pesticide. Results The oleophobic properties of bovine serum albumin (BSA) were exploited to encapsulate the hydrophobic pesticide THI by self-assembly, and the size of the obtained nanoparticles, THI@BSA·NPs, was approximately 23 nm. The loading efficiency reached 70.4%, and THI@BSA·NPs could be released continuously for over 15 days, with the cumulative release reaching 93.5%. The fluorescein isothiocyanate (FITC)-labeled nanoparticles were evenly distributed in the digestive tract and body surface of a typical TBPs, M. alternatus, and the stomach and contact toxicities increased by 33.7% and 25.9%, respectively, compared with those of free THI. Furthermore, the results showed that the transport efficiency of THI@BSA·NPs was highest at a concentration of 50 μg/mL, and the THI@BSA·NPs content in the trunk, from to lower to higher layers, was 8.8, 8.2, 7.6, and 5.8 μg/g. At the same time, THI@BSA·NPs also exhibited high transport efficiency in dead trees. Conclusion The transport efficiency and toxicity of the active ingredients are the key factors for the control of TBPs. This work provided idea for the application of biological delivery system encapsulated hydrophobic pesticides. The novel self-assembled THI@BSA·NPs have promising potential for sustainable control of TBPs.

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Analysis of Particle Size Regulating the Insecticidal Efficacy of Phoxim Polyurethane Microcapsules on Leaves

Cited by 52 publications

References 29 publications

Targeted delivery of emamectin benzoate by functionalized polysuccinimide nanoparticles for the flowering cabbage and controlling Plutella xylostella

Targeted delivery of emamectin benzoate by functionalized polysuccinimide nanoparticles for the flowering cabbage and controlling Plutella xylostella

Sustainable nano-pesticide platform based on Pyrethrins II for prevention and control Monochamus alternatus

Self-assembled bovine serum albumin nanoparticles as pesticide delivery vectors for controlling trunk-boring pests

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