Carboxymethyl Chitosan-Modified Graphene Oxide as a Multifunctional Vector for Deltamethrin Delivery and pH-Responsive Controlled Release, Enhanced Leaf Affinity, and Improved Mosquito-Killing Activity

Song, Saijie; Wan, Minghui; Luo, Yi; Shen, He; Shen, Jian

doi:10.1021/acs.langmuir.2c01669

Cited by 18 publications

(5 citation statements)

References 48 publications

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“…Chilo suppressalis , one of the most serious pests on rice that injures the rice stems and has appeared frequently in recent years (Figure A,B), was utilized to study the control efficacy. , The comparison between FPP and common SCs on the control efficacy against Chilo suppressalis in 48 h was evaluated via the rice spraying method according to the China national standard. However, because of the severe coalescent and agglomeration during long-term storage (3 months), F-SC and SDBS (lack of dispersant) were absent from subsequent evaluations.…”

Section: Resultsmentioning

confidence: 99%

Using a Dynamic Hydrophilization Strategy to Achieve Nanodispersion, Full Wetting, and Precise Delivery of Hydrophobic Pesticide

Zhao

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Various strategies have been developed to improve the applicability of hydrophobic pesticides for better effectiveness in agriculture. However, existing formulations of hydrophobic pesticides still suffer from complicated processing, abused organic solvents, indispensable surfactants, or inescapable ecotoxicity, which strictly limit their applications. Herein, a dynamic covalent bond tailored pesticide (fipronil) amphiphile is constructed to address the above issues, which accomplishes the nanodispersion, full wetting, and precise delivery without organic solvents, surfactants, and materials simultaneously. By introducing a hydrophilic ligand on the hydrophobic fipronil through an imine bond, the cleavable fipronil amphiphile (FPP) exhibits superior water solubility and can even self-assemble into micelles at higher concentrations, which can be directly applied in powder form without organic solvents. Attributed to the suitable hydrophilic/ hydrophobic ratio, FPP achieves full wetting and effective deposition on superhydrophobic rice leaves without surfactants. Moreover, benefiting from the unique dynamic nature of the imine bond, FPP maintains good storage stability while sensitively releasing back to fipronil under the humidity and pH trigger, consequently implementing the precise delivery for nontarget Apis cerana and target Chilo suppressalis without materials. To our knowledge, this dynamic covalent bond tailored amphiphile strategy is the first idea that simultaneously takes the dispersibility, wettability, and responsiveness of hydrophobic pesticides into account, providing a possibility to control the entire journey of field application and even promising to be incorporated into the synthesis process, thus paving the way for modern sustainable agriculture.

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Section: Resultsmentioning

confidence: 99%

Using a Dynamic Hydrophilization Strategy to Achieve Nanodispersion, Full Wetting, and Precise Delivery of Hydrophobic Pesticide

Zhao

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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“…Enhancing the adhesion of pesticides on foliage can effectively improve pesticide utilization. − Based on the potential adhesion and prominent viscoelasticity of JNSs-stabilized Pickering emulsions presented in rheological measurement, an adhesive pesticide emulsion is prepared by loading the model pesticide Av (termed Av-Emul). Along the route reported in our previous work, the adhesion ability of the Av-Emul is evaluated by comparing the amounts of samples remaining on interfaces before and after simulating rainwash.…”

Section: Resultsmentioning

confidence: 99%

Versatile Pickering Emulsions Stabilized by Polyphenolic 2D Janus Nanosheets Enhance Foliar Deposition of Agrochemicals

Li,

Zhang,

Sheng

et al. 2023

ACS Appl. Nano Mater.

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Pesticide emulsion, as an important agrochemical formulation, usually suffers from poor stability, weak foliar deposition, and pollution caused by too much dosage of conventional surfactants. Herein, we propose an effective strategy to solve these issues via designing a green and functional surfactant, 2D Janus nanosheets (JNSs), based on adhesive catecholamine compounds to stabilize a pesticide-loaded Pickering emulsion. First, amphipathic 2D octadecylamine−polypyrogallol JNSs (ODA−PPG JNSs) are prepared by a facile and one-step route and are applied to construct a versatile Pickering emulsion. The JNSs-stabilized Pickering emulsions present a remarkable tolerance stability toward ultra-pH (pH = 3, 11) and can achieve an unusual phase inversion accompanying the variation of emulsion viscoelasticity. Owing to the outstanding adhesivity and surfactivity endowed by ODA−PPG JNSs, the pesticide emulsion loaded with a model pesticide avermectin (Av-Emul) performs significantly enhanced foliar deposition than the commercial Av-Tech. Combined with the theoretical calculation, the adhesion mechanism involved in the synergistic action of π−π stacking and H-bonds is unraveled in a molecular scale. The "JNSs-stabilized pesticide emulsions" not only present excellent adhesion on both the hydrophilic and hydrophobic surfaces but also outperform the other conventional pesticide emulsions stabilized by small-molecule surfactants in wettability and spreadability to reduce droplets bouncing on the foliage. This work provides an insight into the structure−adhesivity relationship derived from the non-covalent interaction of polyphenolic JNSs. The proposed innovative strategy for facilitating pesticide utilization demonstrates great promise in formulating agrochemicals.

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“…Along with population growth, global climate change has increased the challenges facing food security and agricultural fields . One of the challenges facing the agricultural field is low crop yields, where fungi, viruses, harmful insects, and organisms can all affect food production. , So far, pesticides that have quick action properties effectively safeguard crops against pests and diseases, resulting in a significant increase in crop yields by up to 30 to 40%. , However, conventional pesticide formulations still face significant drawbacks, including low adhesion to target foliar surfaces, short effective time in the field, nontarget toxicity, and negative environmental impacts. , Consequently, reducing the quantity of pesticide applications without compromising their effectiveness is a crucial issue that needs to be addressed. Fortunately, controlled and slow-release micro/nanocarriers can meet the challenge of pesticide misuse …”

Section: Introductionmentioning

confidence: 99%

“…2,3 So far, pesticides that have quick action properties effectively safeguard crops against pests and diseases, resulting in a significant increase in crop yields by up to 30 to 40%. 4,5 However, conventional pesticide formulations still face significant drawbacks, including low adhesion to target foliar surfaces, short effective time in the field, nontarget toxicity, and negative environmental impacts. 6,7 Consequently, reducing the quantity of pesticide applications without compromising their effectiveness is a crucial issue that needs to be addressed.…”

Section: ■ Introductionmentioning

confidence: 99%

Multifunctional Mesoporous Silica Nanosheets for Smart Pesticide Delivery and Enhancing Pesticide Deposition

Lv,

Hong,

Wan

et al. 2023

Langmuir

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A multifunctional nanopesticide delivery system is considered to be a novel and efficient tool for controlling pests in modern agriculture. In this study, a mesoporous silica nanosheet (H-MSN) carrier for intelligent delivery of pesticides was prepared by the sol−gel method. The prepared H-MSN carrier had obvious hexagonal flat structure, with a specific surface area of 759.9 m 2 /g, a transverse diameter of about 340 nm, a thickness of about 80 nm, and regular channels being perpendicular to the plane. Polyethylene glycol diacrylate (PEGDA) and sulfhydryl-modified polyethylenimide (PEI-SH) were used to block the insecticide after loading the insecticide imidacloprid (IMI). The introduction of hydrophilic PEI-SH/PEGDA greatly improved the leaf wettability and adhesion ability of H-MSN.

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Carboxymethyl Chitosan-Modified Graphene Oxide as a Multifunctional Vector for Deltamethrin Delivery and pH-Responsive Controlled Release, Enhanced Leaf Affinity, and Improved Mosquito-Killing Activity

Cited by 18 publications

References 48 publications

Using a Dynamic Hydrophilization Strategy to Achieve Nanodispersion, Full Wetting, and Precise Delivery of Hydrophobic Pesticide

Using a Dynamic Hydrophilization Strategy to Achieve Nanodispersion, Full Wetting, and Precise Delivery of Hydrophobic Pesticide

Versatile Pickering Emulsions Stabilized by Polyphenolic 2D Janus Nanosheets Enhance Foliar Deposition of Agrochemicals

Multifunctional Mesoporous Silica Nanosheets for Smart Pesticide Delivery and Enhancing Pesticide Deposition

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