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:3/28/2017)... PUNE, India , March 28, 2017 ... (Analog, IP, Biometrics), Hardware (Camera, Monitors, Servers, Storage Devices), ... Maintenance), Vertical, and Region - Global Forecast to 2022", ... 30.37 Billion in 2016 and is projected to reach ... 15.4% between 2017 and 2022. The base year considered ...
(Date:3/23/2017)... March 23, 2017 The report "Gesture Recognition and Touchless ... and Geography - Global Forecast to 2022", published by MarketsandMarkets, the market is ... of 29.63% between 2017 and 2022. Continue Reading ... ... ...
(Date:3/22/2017)... Vigilant Solutions , a vehicle location ... announced today the appointment of retired FBI special agent ... business development. Mr. Sheridan brings more than ... focus on the aviation transportation sector, to his new ... Sheridan served as the Aviation Liaison Agent Coordinator (ALAC) ...
Breaking Biology News(10 mins):
(Date:5/21/2017)... Diego, CA (PRWEB) , ... May 20, 2017 ... ... support tool that helps avoid the lengthy trial and error process by finding ... patients. It can also strengthen the doctor-patient relationship through a personalized approach ...
(Date:5/18/2017)... (PRWEB) , ... May 18, 2017 , ... ... procedure on April 28, 2017 at the Prince Of Wales Private Hospital. The ... disc at level C6-C7. The patient failed conservative treatments prior to undergoing surgery. ...
(Date:5/18/2017)... ... May 17, 2017 , ... NDA Partners Chairman Carl ... CEO of Eurofins Advantar Laboratories and President of Pharmaceutical Development Business Unit of Cardinal ... at Eurofins and Cardinal Health, he was former Chief Operating Officer at Anaborex, Senior ...
(Date:5/18/2017)... , ... May 17, 2017 , ... ... and business process optimization firm for the life sciences and healthcare industries, is ... UDIs and Traceability for Medical Devices conference in Brussels, Belgium. , Crowley played ...
Breaking Biology Technology: