کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5766168 | 1627553 | 2017 | 10 صفحه PDF | دانلود رایگان |
- Marine bacteria (planktonic populations) were susceptible to 1 mg Lâ1 of AgNPs.
- Toxicity of AgNPs is bacterial species-specific.
- OECD certified AgNPs IC50 < 0.15 mg Lâ1 for Arthrobacter sp. marine bacterium.
- Household products containing AgNPs showed strong antibacterial effect.
Scarce information is available regarding the fate and toxicology of engineered silver nanoparticles (AgNPs) in the marine environment, especially when compared to other environmental compartments. Hence, the antibacterial activity of the NM-300 AgNPs (OECD programme) and a household product containing colloidal AgNPs (Mesosilver) was investigated using marine bacteria, pure cultures and natural mixed populations (microcosm approach). Bacterial susceptibility to AgNPs was species-specific, with Gram negative bacteria being more resistant than the Gram positive species (NM-300 concentration used ranged between 0.062 and 1.5 mg Lâ1), and the Mesosilver product was more toxic than the NM-300. Bacterial viability and the physiological status (O2 uptake measured by respirometry) of the microbial community in the microcosm was negatively affected at an initial concentration of 1 mg Lâ1 NM-300. The high chloride concentrations in the media/seawater led to the formation of silver-chloro complexes thus enhancing AgNP toxicity. We recommend the use of natural marine bacteria as models when assessing the environmental relevant antibacterial properties of products containing nanosilver.
Journal: Marine Environmental Research - Volume 130, September 2017, Pages 293-302