Navigation Links
Evidence that nanoparticles in sunscreens could be toxic if accidentally eaten
Date:6/23/2010

Scientists are reporting that particle size affects the toxicity of zinc oxide, a material widely used in sunscreens. Particles smaller than 100 nanometers are slightly more toxic to colon cells than conventional zinc oxide. Solid zinc oxide was more toxic than equivalent amounts of soluble zinc, and direct particle to cell contact was required to cause cell death. Their study is in ACS' Chemical Research in Toxicology, a monthly journal.

Philip Moos and colleagues note that there is ongoing concern about the potential toxicity of nanoparticles of various materials, which may have different physical and chemical properties than larger particles. Barely 1/50,000 the width of a human hair, nanoparticles are used in foods, cosmetics and other consumer products. Some sunscreens contain nanoparticles of zinc oxide. "Unintended exposure to nano-sized zinc oxide from children accidentally eating sunscreen products is a typical public concern, motivating the study of the effects of nanomaterials in the colon," the scientists note.

Their experiments with cell cultures of colon cells compared the effects of zinc oxide nanoparticles to zinc oxide sold as a conventional powder. They found that the nanoparticles were twice as toxic to the cells as the larger particles. Although the nominal particle size was 1,000 times larger, the conventional zinc oxide contained a wide range of particle sizes and included material small enough to be considered as nanoparticles. The concentration of nanoparticles that was toxic to the colon cells was equivalent to eating 2 grams of sunscreen about 0.1 ounce. This study used isolated cells to study biochemical effects and did not consider the changes to particles during passage through the digestive tract. The scientists say that further research should be done to determine whether zinc nanoparticle toxicity occurs in laboratory animals and people.


'/>"/>

Contact: Michael Bernstein
m_bernstein@acs.org
202-872-6042
American Chemical Society
Source:Eurekalert  

Page: 1

Related biology news :

1. Neanderthal genome yields insights into human evolution and evidence of interbreeding
2. Study adds to evidence that autism has genetic basis
3. Panel finds insufficient evidence for Alzheimers disease preventive measures
4. New evidence in plants shows micro-RNA can move
5. New evidence that green tea may help fight glaucoma and other eye diseases
6. First evidence that chitosan could repair spinal damage
7. Human fossil discovery -- evidence of new Homo species
8. Evidence of increasing antibiotic resistance
9. More evidence on benefits of high blood pressure drugs in diabetic eye disease
10. Retail meat linked to urinary tract infections: Strong new evidence
11. First evidence that blueberry juice improves memory in older adults
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Evidence that nanoparticles in sunscreens could be toxic if accidentally eaten
(Date:3/10/2016)... 10, 2016   Unisys Corporation (NYSE: UIS ... (CBP) is testing its biometric identity solution at the ... to help identify certain non-U.S. citizens leaving the country. ... designed to help determine the efficiency and accuracy of using ... and will run until May 2016. --> ...
(Date:3/9/2016)... HAMBURG, Germany , March 9, 2016 ... African country,s government identified that more than 23,000 public ... name or had been receiving their salary unlawfully.    ... West African country,s government identified that more than 23,000 ... recorded name or had been receiving their salary unlawfully. ...
(Date:3/8/2016)... 2016   Valencell , the leading innovator ... has secured $11M in Series D financing. The ... venture fund being launched by UAE-based financial services ... investors TDF Ventures and WSJ Joshua Fund. Valencell ... triple-digit growth and accelerate its pioneering innovation in ...
Breaking Biology News(10 mins):
(Date:5/4/2016)... ... ... Proove Biosciences, Inc. , the commercial and research leader in personalized ... The partnership is designed to advance research in pain genetics in an effort to ... the new agreement, researchers at Proove Biosciences are able to collaborate with Luda Diatechnko, ...
(Date:5/4/2016)... New York , May 4, 2016 ... by Transparency Market Research "Metabolomics Market - Global Industry ... 2024", the metabolomics market is anticipated to expand at ... reach USD 2,494.8 million by 2024. Metabolomics ... as metabolites, within cells, biofluids, tissues or organisms. Together, ...
(Date:5/3/2016)... , May 3, 2016 ... (Genomics, Drug Discovery, Gene Expression) Lab-on-a-chip (IVD ... (Academics Institutes, Diagnostics Centers), Fabrication Technology (Microarrays, ... MarketsandMarkets, the market is expected to reach ... 7.63 Billion in 2015, growing at a ...
(Date:5/3/2016)... Boston, Massachusetts (PRWEB) , ... May 03, 2016 ... ... communities will gather at Boston CEO 2016 on May 31st and June 1st ... off-the-record networking forum for leading executives in the life sciences, offering exclusive access ...
Breaking Biology Technology: