Preparation and characterization of a novel imidacloprid microcapsule via coating of polydopamine and polyurea

Gao, Zhen; Pang, Long; Feng, Haojie; Wang, Shunyi; Wang, Qiuyun; Wang, Mengyao; Xia, Yining; Hu, Shuwen

doi:10.1039/c7ra01527e

Cited by 24 publications

(16 citation statements)

References 35 publications

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“…The loading capacity (LC) is the percentage of the core material incorporated into a microcapsule relative to the total mass of the microcapsule (core and shell), which reflects the amount of core material contained in a unit mass of microcapsule; it was determined by using a previously reported method [41]. Freshly prepared microcapsule suspension was washed consecutively with methanol and water, centrifuged, and dried naturally.…”

Section: Determination Of Encapsulation Efficiency and Loading Capacitymentioning

confidence: 99%

Preparation of Polyurea Microcapsules by Interfacial Polymerization of Isocyanate and Chitosan Oligosaccharide

Wang

Zhao

et al. 2021

Materials

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(2-((1-(4-chlorophenyl)-1H-pyrazol-3-yl)oxy)-N-(3,4-dichlorophenyl)-propanamide) is a new oil-soluble compound with good fungicidal activity against Rhizoctonia solani. Chitosan oligosaccharide (COS) is the depolymerization product of chitosan and can be developed into biological pesticides, growth regulators, and fertilizers due to its various bioactivities. COS is an oligomer of β- (1 → 4)-linked d –glucosamine and can be taken as a polyamine. In this study, microcapsules were prepared by interfacial polymerization of oil-soluble methylene diphenyl diisocyanate and water-soluble COS. The effects of several key preparation parameters, e.g., emulsifier dosage, agitation rate during emulsification, and core/shell ratio, on properties of the microcapsules such as the encapsulation efficiency, particle size, and size distribution were investigated. The microcapsules were characterized by infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy, etc., and the encapsulation efficiency and release behaviors were investigated. The results show that the microcapsules have a smooth surface and 93.3% of encapsulation efficiency. The microcapsules showed slow-release behavior following a first-order kinetic equation, and the accumulative release rates of the microcapsules with core/shell mass ratios of 8.0/4.0, 8.0/5.0, and 8.0/6.0, were 95.5%, 91.4%, and 90.1%, respectively, on day 30. Due to many high biological activities, biodegradability, and the pure nature of COS, microcapsules formed from COS are promising for applications in controlled release of pesticides, growth regulators, and fertilizer.

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Section: Determination Of Encapsulation Efficiency and Loading Capacitymentioning

confidence: 99%

Preparation of Polyurea Microcapsules by Interfacial Polymerization of Isocyanate and Chitosan Oligosaccharide

Wang

Zhao

et al. 2021

Materials

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Section: Introductionmentioning

confidence: 99%

Fabrication a controlled-release pesticide for improving UV-shielding properties and reducing toxicity via coating polydopamine

Zhang

et al. 2021

Journal of Environmental Science and Health, Part B

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In modern agriculture, controlled-release formulations (CRF) is greatly desirable for achieving valid utilization and loss reduction of pesticides. It can also alleviate the adverse effect on non-target organism. In this study, we used PDA as a depositing layer, constructed pyraclostrobin@SiO 2 @polydopamine microcapsule (Pyr@SiO 2 @PDA MC). The resulting microcapsule is a near-rod shape (about 1.152μm), which has a drug-loading e ciency of 55%. FT-IR and TG analysis revealed the successful entrapment of the pesticide. The microencapsulation had important function in the slowrelease rate of the pyraclostrobin and superior UV-shielding properties. Moreover, bioactivity of the microcapsule against Fusarium oxysporum f.sp.vasinfectum was determined and it exhibited better inhibition activity than pyraclostrobin technical in the later stage. At last, acute toxicity tests demonstrated that Pyr@SiO 2 @PDA MC on zebra sh with lower toxicity on the rst day. These results showed that Pyr@SiO 2 @PDA MC may process broader application potential in agriculture.

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“…Xin prepared a PDA coated avermectin microcapsules (Av@PDA MC) with prominent sustained-release performance and good adhesion properties 26 . Gao fabricated a novel imidacloprid microcapsule with PDA followed by PU exhibited excellent dispersion stability 27 . Undeniably, PDA is considered to be a promising pesticide encapsulant for obtaining novel controlled release formulation 28-30 . Microcapsules are one of the microparticulate systems which have shown tremendous potential and are used for controlled-release formulation and to improve the environment security and persistence of agrochemicals 31,32 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication a controlled-release pesticide for improving UV-shielding properties and reducing toxicity via coating polydopamine

Zhang

et al. 2020

Preprint

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In modern agriculture, controlled-release formulations (CRF) is greatly desirable for achieving valid utilization and loss reduction of pesticides. It can also alleviate the adverse effect on non-target organism. In this study, we used PDA as a depositing layer, constructed pyraclostrobin@SiO 2 @polydopamine microcapsule (Pyr@SiO 2 @PDA MC). The resulting microcapsule is a near-rod shape (about 1.152μm), which has a drug-loading efficiency of 55%. FT-IR and TG analysis revealed the successful entrapment of the pesticide. The microencapsulation had important function in the slow-release rate of the pyraclostrobin and superior UV-shielding properties. Moreover, bioactivity of the microcapsule against Fusarium oxysporum f.sp.vasinfectum was determined and it exhibited better inhibition activity than pyraclostrobin technical in the later stage. At last, acute toxicity tests demonstrated that Pyr@SiO 2 @PDA MC on zebrafish with lower toxicity on the first day. These results showed that Pyr@SiO 2 @PDA MC may process broader application potential in agriculture.

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Preparation and characterization of a novel imidacloprid microcapsule via coating of polydopamine and polyurea

Abstract: A novel method to encapsulate imidacloprid with step self-polymerization of dopamine and IPDI was developed, which no organic solvent or surfactant was used in the preparation process.

Cited by 24 publications

References 35 publications

Preparation of Polyurea Microcapsules by Interfacial Polymerization of Isocyanate and Chitosan Oligosaccharide

Preparation of Polyurea Microcapsules by Interfacial Polymerization of Isocyanate and Chitosan Oligosaccharide

Fabrication a controlled-release pesticide for improving UV-shielding properties and reducing toxicity via coating polydopamine

Fabrication a controlled-release pesticide for improving UV-shielding properties and reducing toxicity via coating polydopamine

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