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Reducing Environmental Toxicity of Silver Nanoparticles through Shape Control.
Danielle E Gorka1,2, Joshua S Osterberg1,3, Carley A Gwin1,4
1†Center for the Environmental Implications of NanoTechnology (CEINT), Duke University, P.O Box 90287, Durham, North Carolina 27708, United States.
Environmental Science & Technology
|July 7, 2015
Summary
Silver nanocubes show lower environmental toxicity to plants than silver nanoparticles. This research aids in developing safer antibacterial products with reduced ecological impact.
Area of Science:
- Environmental Science
- Materials Science
- Toxicology
Background:
- Antibacterial silver nanomaterials are used in consumer products, raising environmental toxicity concerns.
- Nanoparticles exhibit toxicity to various organisms, necessitating safer alternatives.
- Reducing environmental impact while maintaining antibacterial efficacy is crucial.
Purpose of the Study:
- To compare the environmental toxicity of silver nanocubes versus silver nanoparticles and nanowires.
- To evaluate the antibacterial properties and organism toxicity of different silver nanomaterial shapes.
- To identify silver nanomaterial forms with reduced ecotoxicity for consumer applications.
Main Methods:
- Toxicity testing on model organisms: Lolium multiflorum (plant), Danio rerio (fish), and Caenorhabditis elegans (worm).
- Assessing antibacterial activity against bacterial species: Escherichia coli, Bacillus cereus, and Pseudomonas aeruginosa.
- Comparative analysis of silver nanocubes, nanoparticles, and nanowires effects on organism growth and survival.
Main Results:
- Silver nanocubes demonstrated significantly lower toxicity to Lolium multiflorum roots (5.3% shorter) compared to silver nanoparticles (39.6% shorter).
- Toxicity to aquatic organisms (Danio rerio) and soil organisms (C. elegans) was similar across silver nanomaterial shapes.
- Antibacterial efficacy against tested bacterial species remained comparable between silver nanocubes and nanoparticles.
Conclusions:
- Silver nanocubes represent a promising alternative to silver nanoparticles for antibacterial applications due to reduced plant toxicity.
- The findings support the development of environmentally friendlier antibacterial products.
- Shape-dependent toxicity of silver nanomaterials is critical for environmental risk assessment.
