ORIGINAL_ARTICLE
Effects of Dissolved Silver and Silver Nanoparticle on Soil Microorganisms
Silver nanoparticles (AgNPs) are the most commonly used man-made nanomaterial in consumer products.They are merged into a vast collection of products due to their particular broad-spectrum anti-microbial action. On theother hand, their anti-bacterial properties may pose a significant environmental risk. This study was undertaken toassess whether the risk that AgNPs and dissolved Ag pose to soil microorganisms gained from nano- or dissolved-silverforms. The antimicrobial effect of green manufactured AgNPs (46.2±23.2 nm) and Ag+ (as AgNO3) on soil microbeswere studied using disc diffusion assay. Soil microbial growth was assessed by the measurement of inhibitory zone area(mm2) as a function of different AgNPs and AgNO3 concentrations, 0.00, 250, 500, 1000 and 2000 mgl-1. The results ofantimicrobial effect of AgNPs showed 10 fold of magnitude comparing with Ag+ at lower concentrations (250 mgl-1).The theoretical predicted unity of inhibition zone ratio for AgNPs/Ag ions implies that AgNPs equates to about 5 timesantimicrobial effects of Ag+. Although the current results confirm that Ag antimicrobial effect is a nano-specific effect,different bacteria isolated from different soils should be used to explore their physico-chemical properties in mitigatingAgNPs toxicity effects.
https://jsws.journals.ekb.eg/article_6679_ec858f855b1a79ef34f3543be38800b1.pdf
2017-01-01
1
5
10.21608/jsws.2017.6679
silver nanoparticles
dissolved silver
antimicrobial effects
soil microorganisms
Ezzat
Marzouk
1
Soil and Water Sciences Department, Faculty of Environmental Agricultural Sciences, Arish University, North Sinai 45516, Egypt
AUTHOR