Navigation Links
Is nanosilver toxic?
Date:2/28/2013

silver salt. However, more research is required to reach a clear understanding of the safety of silver-containing particles," Niskanen says.

Indeed, silver nanoparticles were found to be ten times less toxic than the soluble silver nitrate a soluble silver salt used for the comparison.

The bioavailability of silver varies in different test media

To explain this phenomenon, the researchers refer to the variance in the bioavailability of silver to crustaceans in different tested media.

University lecturer Olli-Pekka Penttinen from the Department of Environmental Sciences of the University of Helsinki goes on to note that the inorganic and organic compounds dissolved in natural waters (such as humus), water hardness and sulfides have a definite impact on the bioavailability of silver. Due to this, the toxicity of both types of tested nanoparticles and the silver nitrate measured in the course of the study was lower in natural water than in artificial fresh water.

The toxicity of silver nanoparticles and silver ions was studied using two aquatic crustaceans, a water flea (Daphnia magna) and a fairy shrimp (Thamnocephalus platyurus). Commercially available protein-stabilised particles and particles coated with a water-soluble, non-toxic polymer, specifically synthesised for the purpose, were used in the study. First, the polymers were produced utilising a controlled radical polymerisation method. Synthetic polymer-grafted silver particles were then produced by attaching the water-soluble polymer to the surface of the silver with a sulfur bond.

Jukka Niskanen has utilised such polymerisation and coupling reactions in his doctoral dissertation, Polymeric and hybrid materials: polymers on particle surfaces and air-water interfaces, studying several hybrid nanomaterials, i.e., combinations of synthetic polymers and inorganic (gold, silver and montmorillonite) nanoparticles. Niskanen will defend h
'/>"/>

Contact: Jukka Niskanen
jukka.niskanen@helsinki.fi
University of Helsinki
Source:Eurekalert

Page: 1 2 3

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/30/2014)... DURHAM, N.C. -- Pollution in urban and farm runoff ... a new study finds. , The study, published ... shows that nitrogen in the runoff ends up in ... tumors on the animals, eyes, flippers and internal organs. ... and the National Oceanic and Atmospheric Administration (NOAA) conducted ...
(Date:9/30/2014)... wrong with your muscles because of age, disease or injury, ... That,s where a new research report published in the October ... comes in. In the report, a team of scientists produce ... scientists "see" which genes are active in an organ at ... and that men have approximately 400 more active genes in ...
(Date:9/30/2014)... , Sept. 30, 2014  Spectra ... solutions for the biotech and power generation ... new RECONN Bioprocess Manager, an easy-to-use and ... geared towards bioprocess development laboratories. ... disparate bioreactor and analyzer systems. Accessing and ...
Breaking Biology News(10 mins):Pollution linked to lethal sea turtle tumors 2Pollution linked to lethal sea turtle tumors 3Scientists identify which genes are active in muscles of men and women 2Spectra Automation Introduces RECONN Bioprocess Manager 2
... National Institute of Standards and Technology (NIST) have ... clumps of proteins in protein-based pharmaceuticals. This first ... can be assured that their instruments are faithfully ... concern because of its impact on quality control ...
... laundry products and air fresheners found the products emitted ... off at least one chemical regulated as toxic or ... was listed on the product labels. , "I first ... me that the air fresheners in public restrooms and ...
... the first issue of , Energy & Environmental Science ... Free for all to read online, this inaugural ... hydrogen storage, thermochemical biofuel production, sustainable energy, and much ... of the highest quality, knowing that they can rely ...
Cached Biology News:NIST trumps the clumps: Making biologic drugs safer 2Toxic chemicals found in common scented laundry products, air fresheners 2Toxic chemicals found in common scented laundry products, air fresheners 3
(Date:10/1/2014)... 1, 2014  Spherix Incorporated (Nasdaq: SPEX) -- an intellectual ... monetization of intellectual property, announced today that the ... Uniden in the U.S. District Court for the ... has been rescheduled for November 10, 2014.  This ... The Court Order setting the Markman date was ...
(Date:10/1/2014)... Irvine, CA (PRWEB) September 30, 2014 ... for user-friendly, cost-effective tools to address sales, training ... PMG has developed innovative mobile applications to ... studies, outlining the agency’s latest customized mobile app ... http://www.studiopmg.com/work . , In partnership with Toyota, ...
(Date:10/1/2014)... Ill. (PRWEB) October 01, 2014 The ... $9,956,011 to Southern Illinois University Edwardsville as part of ... (TAACCCT) initiative. The funding is co-administered by the Department ... Joe Biden, Secretary of Labor Thomas E. Perez and ... $450 million in job-driven training grants to nearly 270 ...
(Date:9/30/2014)... This news release is available in German . ... at the Technische Universitt Mnchen (TUM) have demonstrated a ... Their experiments show that future computer chips could be ... transistors. As the main enabling technology of the semiconductor ... fundamental limits, the TUM researchers and collaborators at the ...
Breaking Biology Technology:Markman Hearing Date for VTech and Uniden Litigation Now Set for November 10, 2014 2Digital Agency Studio PMG Launches New Case Studies on Website 2U.S. Dept. of Labor Awards SIUE Nearly $10-Million Grant 2U.S. Dept. of Labor Awards SIUE Nearly $10-Million Grant 3U.S. Dept. of Labor Awards SIUE Nearly $10-Million Grant 4A new dimension for integrated circuits: 3-D nanomagnetic logic 2A new dimension for integrated circuits: 3-D nanomagnetic logic 3
... ... ... , , , ... ...
... ... web to cost effectively boost the pool of eligible patients for screening for any ... upload recruitment material approved by their Institutional Review Board (IRB), on their own specific ... ...
... ... ... ... ...
Cached Biology Technology:Spectral granted IDE approval by U.S. FDA to conduct pivotal trial for Toraymyxin(TM) 2Spectral granted IDE approval by U.S. FDA to conduct pivotal trial for Toraymyxin(TM) 3Spectral granted IDE approval by U.S. FDA to conduct pivotal trial for Toraymyxin(TM) 4RESolutions Rapid Enrollment Solutions, LLC Announces Launch of Novel Patient Recruitment Web Site - Clinical Trial Spotlight™ 2RESolutions Rapid Enrollment Solutions, LLC Announces Launch of Novel Patient Recruitment Web Site - Clinical Trial Spotlight™ 3China-Biotics, Inc. Inaugurated the Commercial Production of its New Production Facility 2China-Biotics, Inc. Inaugurated the Commercial Production of its New Production Facility 3China-Biotics, Inc. Inaugurated the Commercial Production of its New Production Facility 4China-Biotics, Inc. Inaugurated the Commercial Production of its New Production Facility 5China-Biotics, Inc. Inaugurated the Commercial Production of its New Production Facility 6China-Biotics, Inc. Inaugurated the Commercial Production of its New Production Facility 7