Indoxacarb-Loaded Anionic Polyurethane Blend with Sodium Alginate Improves pH Sensitivity and Ecological Security for Potential Application in Agriculture

Abstract

Traditional pesticide formulations show poor utilization and environmental safety due to their low foliage adhesion and large auxiliaries. In this study, a novel and environment-friendly indoxacarb formulation was prepared to improve the pesticide’s utilization rate, target control characteristics and ecological security. Indoxacarb-loaded waterborne polyurethane–sodium alginate (PU/SA) nanoemulsions with film forming properties, alkaline responsive release, high effectiveness against Spodoptera litura, and reduced acute contact toxicity for nontarget organisms were successfully prepared. The colloidal properties, swelling and release behaviors, leaf adhesion, degradation dynamics and bioactivity assay of the indoxacarb-loaded PU/SA nanoemulsions were determined. Results showed that the obtained indoxacarb-loaded microcapsule particulates were approximately 57 nm in diameter, electronegative −45.9 mV, and uniformly dispersed in the nanoemulsions. The dried latex films of PU/SA in the alkaline environment revealed better responsive swelling and release characteristics than those in acidic and neutral conditions. Compared with a commercial emulsifiable concentrate, the indoxacarb-loaded PU/SA nanoemulsions were useful for the targeted control of S. litura, which have alkaline gut and showed reduced acute contact toxicity to Harmonia axyridia. Furthermore, the PU/SA formulation had better foliage adhesion and indicated the property of controlled-release and a persistent effect.

Sustainable and greener coatings produced from accelerator‐ and sulfur‐free polyurethane dispersion/carboxylated nitrile butadiene latex blends

“…12,13 Some efforts have been made to blend PUD (as a major or minor phase) with other polymeric materials, for example, casein-caprolactam, 14 soy protein derivatives, [15][16][17] kefiran, 18 polyethylene oxide, 19 polyacrylate, 20 and sodium alginate. 21 The PUD blending demonstrated improvements in selected properties as well as the sustainability of the final products. Despite the fact that the use of PUD is beneficial to both the environment and the user, there are some drawbacks to this polymer, such as its low thermal resistance, susceptibility to water permeation due to its hydrophilicity, and poor mechanical properties.…”

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

“…are developed as nanocarriers for pesticide delivery and pest control. − Huang group used mesoporous silica as a carrier for IDC (loading rate 24%) and studied its insecticidal activity against Plutella xylostella L . Wang and colleagues reported polyurethane-sodium alginate nanopesticide for IDC loading (loading rate: ∼9%) and Spodoptera litura control . Recently, Yang et al developed a carboxylated β-cyclodextrin-anchored hollow mesoporous silica as a carrier for IDC (loading rate: 26.42%) and found that it exhibited a significantly improved antipest performance against S.…”

“…19−22 Huang group used mesoporous silica as a carrier for IDC (loading rate 24%) and studied its insecticidal activity against Plutella xylostella L. 23 Wang and colleagues reported polyurethane-sodium alginate nanopesticide for IDC loading (loading rate: ∼9%) and Spodoptera litura control. 24 Recently, Yang et al developed a carboxylated β-cyclodextrin-anchored hollow mesoporous silica as a carrier for IDC (loading rate: 26.42%) and found that it exhibited a significantly improved antipest performance against S. frugiperda. 12 The previous studies have made important development in IDC formulation innovation; however, the pesticide loading rate is low and the preparation process is relatively complex, which means more carriers and costs.…”

Role of Some Nanoformulations in Suppression of Silver Whitefly, Bemisia tabaci Population in Compared with Their Conventional Formulations in Tomato Fields

“…Nanoformulation of indoxacarb was used against the cotton leafworm (Sabry et al, 2021). Indoxacarb formulation was developed to nanoformulation to improve the pesticide's utilization rate, target control characteristics and ecological security (Wang et al, 2020). Spirotetramat also used against wide range of insect pests such as sucking insects in their juvenile, immature stages, including aphids, scale insects and whitefly (Salazar-López et al, 2016).…”