Antimicrobial Magnesium Hydroxide Nanoparticles As An Alternative To Cu Biocide For Crop Protection

Keywords

agriculture; antibacterial; biocide; crop protection; magnesium hydroxide; nanoparticles

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, ζ = -22 mV) or betaine (ζ = +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.

Publication Date

8-22-2018

Publication Title

Journal of Agricultural and Food Chemistry

Volume

66

Issue

33

Number of Pages

8679-8686

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/acs.jafc.8b01727

Socpus ID

85050602172 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85050602172

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