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Enzyme and pH dual-responsive avermectin nano-microcapsules for improving its efficacy

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Abstract

The overdosage use of pesticide was harmful to the environment and human health, which was mainly caused by the low utilization rate of the pesticide. However, the pesticide microcapsule with sustained-release and stimulating response properties could effectively solve this problem. Preparation of carboxymethyl cellulose grafting dimethyldiallylammonium chloride (CMC-g-PDMDAAC) through grafting polymerization and trapping as well as encapsulation of avermectin (AVM) via electrostatic interactions resulted in the formation of AVM/CMC-g-PDMDAAC microcapsules. The results showed that the particle size was 200~300 nm. The encapsulation efficiency was as high as 72.06%. Furthermore, the remaining rate of encapsulated AVM increased from 50.0 to 81.60% after UV irradiation for 359 min. The microcapsules exhibited significant enzyme and pH stimuli responsiveness. Finally, CMC-g-PDMDAAC had no significant difference effect on the toxicity of AVM, AVM could be found, and DMDAAC featured a synergistic effect on the toxicological effects of AVM.

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Funding

This research was funded by National Natural Science Foundation of China (Grant No. 21576303, 21606262), Natural Science Foundation of Guangdong Province (Grant No. 2016A030313375, 2017A030311003), and Science and Technology Program of Guangzhou, China (Grant No. 201604020054, 201904020068). Financial support was provided by the National Key R&D Program of China (Grant No. 2018YFD0200306).

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Correspondence to Hongjun Zhou or Xinhua Zhou.

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Responsible editor: Philippe Garrigues

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Liu, G., Lin, G., Lin, X. et al. Enzyme and pH dual-responsive avermectin nano-microcapsules for improving its efficacy. Environ Sci Pollut Res 26, 25107–25116 (2019). https://doi.org/10.1007/s11356-019-05804-9

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  • DOI: https://doi.org/10.1007/s11356-019-05804-9

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