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

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Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, China
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Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou 510642, China
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Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, South China Agricultural University, 483 Wushan Road, Guangzhou 510642, China
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Authors to whom correspondence should be addressed.
Polymers 2020, 12(5), 1135; https://doi.org/10.3390/polym12051135
Received: 21 March 2020 / Revised: 19 April 2020 / Accepted: 24 April 2020 / Published: 15 May 2020
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. View Full-Text
Keywords: indoxacarb; anionic polyurethane; sodium alginate; nanoemulsions; bioactivity indoxacarb; anionic polyurethane; sodium alginate; nanoemulsions; bioactivity
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MDPI and ACS Style

Wang, S.; Zhang, Y.; Yang, L.; Zhu, Q.; Ma, Q.; Wang, R.; Zhang, C.; Zhang, Z. Indoxacarb-Loaded Anionic Polyurethane Blend with Sodium Alginate Improves pH Sensitivity and Ecological Security for Potential Application in Agriculture. Polymers 2020, 12, 1135.

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