Metal–Organic Framework (UiO-66)-Based Temperature-Responsive Pesticide Delivery System for Controlled Release and Enhanced Insecticidal Performance against Spodoptera frugiperda

Abstract

Spodoptera frugiperda is a global pest that brings about great disasters to crops. Conventional pesticide formulations often suffer from poor water solubility, low stability, burst release, weak leaf adhesion, and low efficiency. To improve the insecticidal activity of pesticides, a stimuli-responsive controlled release pesticide delivery system (PDS) has attracted extensive attention in recent years. This paper reports a temperatureresponsive controlled release PDS based on poly(N-isopropyl acrylamide) (PNIPAm)modified indoxacarb (IDC)-loaded UiO-66-(COOH) 2 (IDC@UiO-66-(COOH) 2 -PNI-PAm) and studies its insecticidal activities against S. frugiperda. The UiO-66-(COOH) 2 nanocarrier has an excellent pesticide loading performance, and the loading rate for IDC is 78.69%. The as-prepared PDS has good stability, temperature-responsive controllable release performance, and enhanced leaf affinity, so it can effectively improve the utilization rate of IDC. The insecticidal experiment indicates that the PDS has an enhanced control effect against S. frugiperda. In addition, biosafety analysis further verifies that the PDS exhibits no obvious negative effects on the germination of maize seeds and the growth of maize seedlings. In view of this, we believe that this PDS will have a broad application in the field of pesticide formulation innovation, pest management, and sustainable agricultural development.

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

“…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.…”

Tannic Acid-Modified MXene as a Nanocarrier for the Delivery of β-Cyfluthrin as a Sustained Release Insecticide

“…The biosafety of the nanopesticide was studied according to the previous literature. The germination rate of maize seeds and the growth times of maize seedlings were used to simply evaluate the phytotoxicity of the nanopesticide. ,, The experiment steps were similar to the previous literature, and the nanopesticide sample was MXene-TA-β-CYF.…”

“…Recently, nanomaterial-based pesticide delivery systems (PDSs) have drawn increasing interest for their controllable preparation route, improved water dispersion stability, high pesticide loading rate, sustained release, and enhanced insecticidal activity. − Materials including carbon nanomaterials, polymers, metal–organic frameworks, mesoporous materials, etc., are developed as nanocarriers for pesticide delivery in the past decade. , Especially, the stimuli-responsive controlled release of PDSs has attracted extensive interest because the pesticide release behavior can be accurately controlled according to exogenous stimuli, which will greatly improve the utilization and activity of pesticides. − For example, Kaziem et al developed a carboxymethyl starch-modified hollow mesoporous silica-based PDS for abamectin delivery and found that the release of abamectin can be controlled by pH and enzyme dual stimuli . Song and colleagues reported a carboxymethyl chitosan surface-decorated carbon nanoparticle for emamectin benzoate (EB) delivery and found that it exhibited pH-responsive release performance .…”

Multifunctional Metal–Organic Framework (MOF)-Based Nanoplatforms for Crop Protection and Growth Promotion

“…For another instance, Shen, Wu, Song, and co-workers developed a temperature-responsive nanocomposite, namely, IDC@UiO-66-(COOH) 2 -PNIPAm, to release pesticide and efficiently control Spodoptera frugiperda . UiO-66-(COOH) 2 composed of Zr 4+ and pyromellitic acid (H 4 BTEC) linkers was used as a reservoir to load insoluble indoxacarb (IDC), a broad-spectrum insecticide, with a high loading capacity of 78.69%, followed by the modification of a temperature-sensitive poly­( N -isopropylacrylamide) (PNIPAm) by a covalent grafting approach to develop IDC@UiO-66-(COOH) 2 -PNIPAm.…”

“…119 Carboxymethyl cellulose (CMC), a pH-responsive polymer molecule, was modified on the surface of UiO-66-NH 2 by an amidation For another instance, Shen, Wu, Song, and co-workers developed a temperature-responsive nanocomposite, namely, IDC@UiO-66-(COOH) 2 -PNIPAm, to release pesticide and efficiently control Spodoptera f rugiperda. 120 UiO-66-(COOH) 2 composed of Zr 4+ and pyromellitic acid (H 4 BTEC) linkers was used as a reservoir to load insoluble indoxacarb (IDC), a broad-spectrum insecticide, with a high loading capacity of 78.69%, followed by the modification of a temperaturesensitive poly(N-isopropylacrylamide) (PNIPAm) by a co-valent grafting approach to develop IDC@UiO-66-(COOH) 2 -PNIPAm. IDC@UiO-66-(COOH) 2 -PNIPAm showed a temperature-dependent release behavior due to PNIPAm molecular chain shrinking above 32 °C enabling IDC molecules to be extruded and released.…”