Development of an online μ-matrix cartridge extraction method for fipronil extraction in contaminated soils

Ying, Liu; Tian, Xinmeng; Xu, Hui; Zhang, Ganbing

doi:10.1016/j.chroma.2022.463258

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…Combining SEM images and EDS mapping, it can be speculated that the insecticide particles are not only distributed on the surface of the hydrogel skeleton but also evenly distributed within the hydrogel network. Simultaneously, considering that β-CD has a certain binding capacity toward imidacloprid, thiamethoxam, and fipronil, − some active ingredients are also encapsulated by the cavity of CDs.…”

Section: Resultsmentioning

confidence: 99%

Promising Delivery Platform for Smart Pest Control with High Water-Retaining Capacity

Zhao

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Hydrogels have been extensively used in agriculture to improve crop yields for their excellent properties. However, they are currently used either as pesticide delivery platforms or water retention agents alone; the combination of these two functions into one agricultural hydrogel formulation has never been reported, which is crucial to promote sustainable development in agriculture. Herein, using poly(β-cyclodextrin) and adamantane-grafted poly(acrylic acid) (PAA–Ada) as the host and guest, respectively, an easy operating, multi-responsive, and safer hydrogel delivery system for insecticides is fabricated by the host–guest interaction between cyclodextrin and adamantane, which can load uniformly dispersed insecticides (fipronil, imidacloprid, and thiamethoxam) up to 60%. Benefiting from the carboxyl and hydroxyl groups on polymer chains, different temperatures (25, 35, and 45 °C) and pH values (5.0, 6.8, and 10.0) change the intermolecular forces within the hydrogel network and then the diffusion of the content, finally resulting in controlled release behaviors. Besides, this platform can rapidly release the insecticides in the presence of amyloglucosidase due to its ring-opening effect on cyclodextrin. Moreover, this platform exhibits high water-retaining capacity toward soil, which can increase the maximum water absorption of nutrient soil and quartz sand by 31.6 and 13.9%, respectively, and slows down the water loss. Compared with commercial formulation, this smart system reduces the acute toxicity to non-target organism earthworms by 52.4% and improves the efficacy against target organism aphids by 47.3%, showing better durability, lower environmental toxicity, and higher efficiency. To our knowledge, this is the first idea that simultaneously adopts the water-retaining capacity and controlled release ability of hydrogels to improve insecticide efficacy. In this regard, this smart hydrogel platform holds great potentials as slow-release granules with water-holding ability for protection against insect pests, providing an alternative platform for the sustainable development in green agriculture.

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Section: Resultsmentioning

confidence: 99%