Development of leaf-adhesive pesticide nanocapsules with pH-responsive release to enhance retention time on crop leaves and improve utilization efficiency

Chen, Hongyan; Zhi, Heng; Liang, Jie; Yu, Manli; Cui, Bo; Zhao, Xiang; Sun, Changjiao; Yan, Wang; Cui, Haixin; Zeng, Zhanghua

doi:10.1039/d0tb02430a

Cited by 52 publications

(33 citation statements)

References 42 publications

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“…The results show that as the stability of HIPEs increases (Figure S4), the UV protection and antioxidant and heat resistance of HIPEs for AVM increase. In addition, the highest residual level of AVM in HIPEs is 80.1% after UV radiation for 72 h (Figure a), which is highest in all AVM delivery systems so far (Figure c). ,− The highest residual AVM content in HIPEs is ∼20% higher than that of the dispersion in bulk oil after heat treatment for 7 days. The reason may be that lignin can easily transfer heat to the air because it emits near-infrared light after heating .…”

Section: Resultsmentioning

confidence: 92%

“…Avermectin (AVM) is one of the most widely used biological pesticides due to its wide spectrum and highly efficient insecticidal activities, low toxicity, low residue, low environmental persistence, high biosafety, etc . However, AVM has a half-life of only 3 h under ultraviolet (UV) irradiation, which would not only result in large dosage and high costs but also make them potentially dangerous to humans and the environment .…”

Section: Introductionmentioning

confidence: 99%

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Basic Amino Acid-Modified Lignin-Based Biomass Adjuvants: Synthesis, Emulsifying Activity, Ultraviolet Protection, and Controlled Release of Avermectin

et al. 2021

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Avermectin (AVM) is a highly effective and safe biopesticide but is very sensitive to ultraviolet (UV) light and exhibits poor water solubility. Developing green and multifunctional adjuvants is important for the protection and controlled release of AVM. In this work, a number of water-soluble enzymatic hydrolysis lignins (W-EHLs) were prepared via grafting basic amino acids and used as emulsifiers with co-surfactants to prepare high-internal phase emulsions (HIPEs). The results showed that W-EHLs with co-surfactants could be prepared with HIPEs that contained 90 vol % green oil phases such as turpentine, and the stability of the HIPEs first increased and then decreased when the rate of grafting of basic amino acids on lignin increased from 0.26 to 1.46 mmol/g. The more polar oil droplets were less deformable due to their higher viscosity, thereby affording a stability advantage to HIPEs. Subsequently, the relations between the stability and interfacial viscoelasticity of the emulsion were effectively correlated by interfacial rheology, droplet size, and physical stability tests. The results showed that HIPEs with smaller droplets had poor fluidity and strong interfacial viscoelasticity due to their higher droplet packing density, which resulted in good macroscopic stability. Like the AVM carrier, the retention rate of AVM in HIPEs was 80.1% after UV radiation for 72 h, which represented the highest UV protection efficiency in AVM delivery systems. The release curves showed that the rate of release of AVM from HIPEs was adjusted by controlling the pH value of the medium. In addition, the release of HIPEs is completely in accord with both diffusion and the matrix erosion mechanism. The strategy could be extended to other sensitive pesticides and used to promote the development of sustainable agriculture.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Basic Amino Acid-Modified Lignin-Based Biomass Adjuvants: Synthesis, Emulsifying Activity, Ultraviolet Protection, and Controlled Release of Avermectin

et al. 2021

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“…However, dust pollution is caused in the process of production and application, because of lacking effective protection measures, which is prone to harming non-target organisms as well. Wettable powder (WP) and emulsifiable concentrate (EC) are main pesticide formulations in conventional pesticide products [ 29 , 30 ], but their actual AIs utilization of biological target uptake is less than 0.1% after dust drift and rainwater leaching [ 31 ].…”

Section: Nanomaterials For Pesticide and Fertilizer Applicationsmentioning

confidence: 99%

Nanomaterials and nanotechnology for the delivery of agrochemicals: strategies towards sustainable agriculture

Sun

et al. 2022

J Nanobiotechnol

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168

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Nanomaterials (NMs) have received considerable attention in the field of agrochemicals due to their special properties, such as small particle size, surface structure, solubility and chemical composition. The application of NMs and nanotechnology in agrochemicals dramatically overcomes the defects of conventional agrochemicals, including low bioavailability, easy photolysis, and organic solvent pollution, etc. In this review, we describe advances in the application of NMs in chemical pesticides and fertilizers, which are the two earliest and most researched areas of NMs in agrochemicals. Besides, this article concerns with the new applications of NMs in other agrochemicals, such as bio-pesticides, nucleic acid pesticides, plant growth regulators (PGRs), and pheromone. We also discuss challenges and the industrialization trend of NMs in the field of agrochemicals. Constructing nano-agrochemical delivery system via NMs and nanotechnology facilitates the improvement of the stability and dispersion of active ingredients, promotes the precise delivery of agrochemicals, reduces residual pollution and decreases labor cost in different application scenarios, which is potential to maintain the sustainability of agricultural systems and improve food security by increasing the efficacy of agricultural inputs. Graphical Abstract

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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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Development of leaf-adhesive pesticide nanocapsules with pH-responsive release to enhance retention time on crop leaves and improve utilization efficiency

Abstract: Leaf-adhesive pesticide nanocapsules improve retention time on crop leaves and utilization efficiency of pest control.

Cited by 52 publications

References 42 publications

Basic Amino Acid-Modified Lignin-Based Biomass Adjuvants: Synthesis, Emulsifying Activity, Ultraviolet Protection, and Controlled Release of Avermectin

Basic Amino Acid-Modified Lignin-Based Biomass Adjuvants: Synthesis, Emulsifying Activity, Ultraviolet Protection, and Controlled Release of Avermectin

Nanomaterials and nanotechnology for the delivery of agrochemicals: strategies towards sustainable agriculture

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

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