Fabrication of pH-responsive nanoparticles for high efficiency pyraclostrobin delivery and reducing environmental impact

Liang, You; Song, Jinhui; Dong, Hezhong; Huo, Zhongyang; Gao, Yunhao; Zhou, Zhiyuan; Tian, Yuyang; Li, Yan; Cao, Yongsong

doi:10.1016/j.scitotenv.2021.147422

Cited by 69 publications

(47 citation statements)

References 66 publications

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“…Accordingly, the IC50 values of Pro@BMMs-SS-Py/β-CD NPs (0.2003 ± 0.0018) were 11% lower than those of Pro TC (0.2249 ± 0.02) owing to the sustained release of Pro in the nanocomplex systems. R. solani secreted acidic substances during colonization [ 42 ], and acidification of the external environment caused the pH response of the NPs. As nanocarriers were modified by β-CD, the connection between β-CD and guest molecules was broken by H + , resulting in the release of Pro under acidic environments.…”

Section: Resultsmentioning

confidence: 99%

pH and Redox Dual-Responsive Mesoporous Silica Nanoparticle as Nanovehicle for Improving Fungicidal Efficiency

Pan

Huang

et al. 2022

Materials

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Prochloraz (Pro) controlled-release nanoparticles (NPs) based on bimodal mesoporous silica (BMMs) with redox and pH dual responses were successfully prepared in this study. BMMs was modified by a silane coupling agent containing a disulfide bond, and β-cyclodextrin (β-CD) was grafted on the surface of the NPs through host–guest interaction. Pro was encapsulated into the pores of nanoparticles by physical adsorption. NPs had a spherical structure, and their average diameter was 546.4 ± 3.0 nm as measured by dynamic light scattering. The loading rate of Pro was 28.3%, and it achieved excellent pH/redox dual-responsive release performance under acidic conditions. Foliage adhesion tests on tomato leaves showed that the NPs had good adhesion properties compared to the commercial formulation. Owing to the protection of the nanocarrier, NPs became more stable under ultraviolet light and high temperature, which improves the efficient utilization of Pro. Biological activity tests showed that the NPs exhibited effective antifungal activity, and the benign biosafety of the nanocarrier was also observed through toxicology tests on cell viability and the growth of Escherichiacoli (E. coli). This work provides a promising approach to improving the efficient utilization of pesticides and reducing environmental pollution.

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Section: Resultsmentioning

confidence: 99%

pH and Redox Dual-Responsive Mesoporous Silica Nanoparticle as Nanovehicle for Improving Fungicidal Efficiency

Pan

Huang

et al. 2022

Materials

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“…Specifically, it was reported that nearly four million tons of pesticides are consumed annually for the management of diseases and crop protection, 4 while however, most active ingredients of pesticides are lost through off-target delivery and uncontrolled release. 5,6 Recently, by applying the strategies to develop responsive nanomedicines, 7 researchers enable the release of an active ingredient of pesticide from a reservoir artificially manipulated by means of different trigger such as light, [8][9][10] temperature, [11][12][13][14] pH [15][16][17] and chemicals, 18,19 which allows the targeted plants treated with pesticide at the right time and at the right dose. These smart or intelligent pesticides are typically made of an active pesticide ingredient and an engineered carrier capable of changing or reacting in response to a specific stimulus.…”

Section: Introductionmentioning

confidence: 99%

Chitosan‐based organic/inorganic composite engineered for UV light‐controlled smart pH‐responsive pesticide through in situphoto‐induced generation of acid

Liu

Chen

Teng

et al. 2022

Pest Management Science

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BACKGROUND: Confined by the volatile property, pesticides are overused and lost significantly during and after spraying, weakening the ecological microbalance among different species of lives. Acid-responsive pesticide is a type of smartly engineered pesticides that contribute to the improvement of utilization efficiency of pesticidal active ingredients in acid-controlled manner, whilst the implementation of acidic solutions may disturb the balance of microenvironment surrounding targeted plants or cause secondary pollution, underscoring the input of acid in a more precise strategy.RESULTS: Chitosan was chemically modified with a photoacid generator (2-nitrobenzaldehyde) serving as a light-maneuvered acid self-supplier, based on which a smart pesticide was formulated by the integration of attapulgite and organophosphate insecticide chlorpyrifos. Under the irradiation of UV light (365 nm), the modified chitosan would undergo a photolytic reaction to generate an acid and pristine chitosan, which seized the labile protons and facilitated the release of chlorpyrifos based on its inherent pH-responsive flexibility. According to the pesticide release performance, the release rate of chlorpyrifos under UV light (27.2 mW/cm 2 ) reached 78%, significantly higher than those under sunlight (22%, 4.2 mW/cm 2 ) and in the dark (20%) within the same time, consistent with the pH reduction to 5.3 under UV light and no obvious pH change for the two other situations, exhibiting an attractive UV light-controlled, acid-propelled release behavior.CONCLUSION: Compared to direct acid spray approach, the proposed in situ photo-induced generation of acid locally on the spots of applied pesticide circumvents the problem of acid contamination to nontargets, demonstrating higher efficiency and biocompatibility for the controlled delivery of acid-responsive pesticides and pest management.

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“…In addition, the metal–phenolic films can respond to pH values due to the decomposition under acidic conditions. In particular, the assembly process of tannic acid and copper ions is not time-consuming and does not involve pollutants or toxic species, which is a simple and green coating strategy. , On the other hand, copper ions mixed with nematicidal compounds such as acids, amines, and carbendazim showed a synergistic nematicidal effect. − Consequently, the coordination assembly strategy of tannic acid and copper ions can be employed to prepare double-shelled silica microcapsules with a stimuli-responsive nanovalve.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Facile Synthesis of Double-Shelled Mesoporous Silica Microcapsules with an Improved Soft-Template Method for Sustainable Pest Management

Zhou

Gao

Chen

et al. 2021

ACS Appl. Mater. Interfaces

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A controlled release formulation based on silica microcapsules is an ideal selection to improve both the effective utilization and duration of pesticides to decrease ecological damage. Herein, a simple and green method for preparing double-shelled microcapsules was developed using a newly prepared quaternary ammonium ionic liquid (IL) as the functional additive to entrap avermectin (Ave) in mesoporous silica nanospheres (MSNs) and tannic acid−Cu (TA−Cu) complex as the sealing agent to form the core−shell structure (Ave-IL@MSN@ TA-Cu). The obtained microcapsules with an average size of 538 nm had pHresponsive release property and good stability in soil. The half-life of microcapsules (34.66 days) was 3 times that of Ave emulsifiable concentrate (EC) (11.55 days) in a test soil, which illustrated that microcapsules could protect Ave from rapid degradation by microorganisms by releasing TA, copper, and quaternary ammonium in the soil. Ave-IL@MSN@TA-Cu microcapsules had better nematicidal activity and antibacterial activity than Ave EC due to the synergistic effect of Ave, IL, and copper incorporated in the microcapsules. Pot experiments showed that the control efficacy of microcapsules was 87.10% against Meloidogyne incognita, which is better than that of Ave EC (41.94%) at the concentration of 1.0 mg/plant by the root-irrigation method after 60 days of treatment owing to the extended duration of Ave in microcapsules. The simple and green method for the preparation of doubleshelled microcapsules based on natural quaternary ammonium IL would have tremendous potential for the extensive development of controlled release pesticide formulations.

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Fabrication of pH-responsive nanoparticles for high efficiency pyraclostrobin delivery and reducing environmental impact

Cited by 69 publications

References 66 publications

pH and Redox Dual-Responsive Mesoporous Silica Nanoparticle as Nanovehicle for Improving Fungicidal Efficiency

pH and Redox Dual-Responsive Mesoporous Silica Nanoparticle as Nanovehicle for Improving Fungicidal Efficiency

Chitosan‐based organic/inorganic composite engineered for UV light‐controlled smart pH‐responsive pesticide through in situphoto‐induced generation of acid

One-Pot Facile Synthesis of Double-Shelled Mesoporous Silica Microcapsules with an Improved Soft-Template Method for Sustainable Pest Management

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