Antimicrobial Magnesium Hydroxide Nanoparticles As an Alternative to Cu Biocide for Crop Protection

Journal of Agricultural and Food Chemistry
Ziyang HuangSwadeshmukul Santra

Abstract

In agriculture, prolonged use of copper biocides increases the risk of development of Cu resistance and its accumulation in soil, demanding an alternative. In this paper, we report antimicrobial magnesium hydroxide nanoparticles (NPs) as an alternative to Cu biocides with low cytotoxicity. To improved bioavailability, Mg hydroxide NPs were synthesized followed by coating with water-soluble capping agents, trisodium citrate (zeta potential, ξ = -22 mV) or betaine (ξ = +35 mV). Electron microscopy study confirmed the formation of ∼10-nm-sized cubical NPs with citrate and ∼100-nm-sized lamellar NPs with betaine. As-synthesized Mg hydroxide NPs inhibited bacterial growth of X. alfalfae, P. syringae, and E. coli within 4 h. Significant bacterial growth inhibition and killing were observed at 24 h post-treatment. Phytotoxicity studies on tomato plants showed no significant tissue injury. Therefore, Mg hydroxide NPs have the potential to serve as a Cu alternative.

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Citations

Jan 27, 2019·ACS Applied Materials & Interfaces·Nagarajan PadmavathySuryasarathi Bose
May 3, 2019·Journal of Agricultural and Food Chemistry·Jianbo ShuaiJianfeng Hu
Sep 18, 2020·Journal of Agricultural and Food Chemistry·Xiaodan YinYing-Qian Liu
Feb 1, 2020·Journal of Agricultural and Food Chemistry·Lijuan ZhaoRong Ji
Nov 12, 2021·Advanced Science·Qi ZhangJianfeng Ping

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