A research team at the UPV/EHU-University of the Basque Country has analysed how zebrafish are affected in the long term by exposure to silver particles
Silver nanoparticles are increasingly being used in consumer products, such as clothing and personal care products, in the medical and pharmaceutical industry, and in the food industry. That is why their presence is expected to increase in the environment where they can exert harmful effects on organisms. The UPV/EHU’s “Cell Biology in Environmental Toxicology” research group has analysed adult zebrafish to find out the effects that in the long term can be caused by these silver particles present in fresh water.
What stands out among the main conclusions of the study is the fact that the distribution of the metal in the organs of the fish is influenced by the form (soluble or nanoparticles) that the silver takes in the water. At the same time, soluble silver was also found to cause short-term alterations (three days) and nanoparticles longer-term alterations (21 days); and that in both cases the animals had purified themselves of the silver accumulated in their bodies after spending six months in clean waters, although inflammation of the gills was found to remain after being exposed to the metal.
In the study, led by Amaia Orbea, three groups of 50-60 adult zebrafish each were used in three aquaria. Silver nitrate was added to the first tank to produce water-soluble silver; 20-nm silver nanoparticles (NP Ag) were added to the second; clean water was added to the third which was used as the control. The groups in the contaminated tanks remained exposed to both forms of the metal for 21 days before spending a further six months in clean water for the purpose of studying the consequences of long-term exposure to silver. A concentration of metal regarded as environmentally significant was used, in other words, a concentration that could be found in nature, for example at the outfall of wastewater from treatment plants. The accumulation of a substance is the first step for intoxication to take place.
After three and 21 days of exposure to silver and after six months in clean water various chemical and biological analyses were carried out on the gills, liver and intestines of the fish. The research team selected the gills because that is the main entry route of the contaminants; the liver because it is the main organ in metabolism and detoxification; and the intestine because the silver nanoparticles can be absorbed through food.
It can be deduced from the analyses that the fish accumulate similar concentrations of metal after being exposed to soluble silver and silver nanoparticles. And that after 6 months in clean water the initial metal concentration levels were recovered. The conclusions differed when the organs of the fish were analysed. The distribution of silver in the liver and intestines depended on the type of metal used in the treatment, but both treatments led to inflammation of the gills of the fish, an effect that remained even after six months in clean water.
Furthermore, the analysis of the transcriptome of the liver revealed a strong impact of exposure to silver. The effect of soluble silver was more intense after three days of exposure when changes were detected in the expression levels of a total of 410 genic sequences. In the case of silver nanoparticles, the alteration was detected 21 days later and affected 799 sequences.
The Latest on: Silver nanoparticles
via Google News
The Latest on: Silver nanoparticles
- New type of low-energy nanolaser that shines in all directions on December 18, 2018 at 6:08 am
An experimental sample of the new laser. It contains ten patches that each have their own silver nanoparticle pattern. The colors on the sample are not the laser light (the laser is not on ... […]
- Simms High School sisters find science success on December 17, 2018 at 8:02 pm
Over the last four years, Madison and Mackenzie Wiegand have been working with silver nanoparticles to kill harmful bacteria like E. coli. When they proved the science that silver particles could ... […]
- Silver Nanoparticles Market – Insights on Future Growth Prospects 2025 on December 17, 2018 at 7:14 pm
Silver nanoparticles are sized between 100 nm to 1 nm and are often used as silver oxide rather than pure silver. One of the key physical properties of using silver nanoparticles is that their structu... […]
- Maximizing the effectiveness of platinum in fuel cells on December 17, 2018 at 4:44 pm
Platinum is a precious metal more rare than silver or gold. Renowned in the fuel cell community ... In this configuration, a few layers of pure platinum atoms cover a cobalt-platinum alloy nanoparticl... […]
- Modification of nitrile latex with magnetite nanoparticles to prevent glove contamination on December 13, 2018 at 5:24 pm
One of the solutions for the problem mentioned is the use of magnetic detectable gloves that can be made from various magnetic mineral materials such as iron oxide, or metals such as steel, lead, silv... […]
- Boron nitride and silver nanoparticles to help get rid of carbon monoxide emissions on December 12, 2018 at 5:51 am
The scheme of synthesizing the nanohybrid catalyst from layered boron nitride, silver nanoparticles, and polyethylene glycol. Credit: Anton S. Konopatsky et al./ Journal of Catalysis, 2018 Russian ... […]
- New report: Metal Biocides market worth 3.49 Billion USD by 2021 on December 11, 2018 at 4:04 pm
The demand for metal biocides is the highest in the medical segment, in terms of value. This is due to the effectiveness of silver nanoparticles against infections on the surfaces of bone implants. Bo... […]
- Boron nitride and silver nanoparticles help get rid of carbon monoxide emissions on December 11, 2018 at 8:07 am
(Nanowerk News) Chemists from NUST MISIS have developed a new hybrid catalyst for carbon monoxide oxidation consisting of hexagonal boron nitride and silver nanoparticles. This material makes it possi... […]
- Global Silver Nanoparticles Market Industry Scenario, Strategies and Forecast 2018-2027 on December 6, 2018 at 1:34 am
The research analysis on Global Silver Nanoparticles Market report build the worldwide prospect of the Silver Nanoparticles industry. This integrate future flow of the Silver Nanoparticles market ... […]
via Bing News