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:1/20/2016)... Jan. 20, 2016  Synaptics Incorporated (NASDAQ: ... solutions, today announced sampling of S1423, its newest ... and small screen applications including smartwatches, fitness trackers, ... round and rectangular shapes, as well as thick ... with moisture on screen, while wearing gloves, and ...
(Date:1/13/2016)... New York , January 13, 2016 ... Market Research has published a new market report titled ... Growth, Trends, and Forecast, 2015 - 2023. According to the ... in 2014 and is anticipated to reach US$1,625.8 mn ... 2015 to 2023. In terms of volume, the biometric ...
(Date:1/11/2016)... , Jan. 11, 2016  higi, the leading ... 10,000 retail locations, web and mobile, today announced ... million from existing investors. --> ... devoted to further innovate higi,s health platform – ... web portal – including expanding services and programs ...
Breaking Biology News(10 mins):
(Date:2/4/2016)... EDISON, N.J. , Feb. 4, 2016 ... company focused on the development and commercialization of targeted ... BIO CEO & Investor Conference 2016, to be held ... and Source Capital Group,s 2016 Disruptive Growth & Healthcare ... on February 10-11, 2016. James Sapirstein ...
(Date:2/4/2016)... , February 4, 2016 ... Laboratories (ABL), Inc. --> Strasbourg, France ... --> PharmaVentures is pleased to announce that it ... its biopharmaceutical manufacturing unit in Strasbourg, France ... --> --> Transgene (Euronext: ...
(Date:2/3/2016)... -- With the growing need for better therapeutics, and ... such as monoclonal antibodies, recombinant protein therapeutics and ... are in high demand. Conventionally expression systems were ... of these therapeutics. However, due to issues with ... approaches and novel expression systems are currently being ...
(Date:2/3/2016)... ... February 03, 2016 , ... ... a new office dedicated to the North American healthcare market. , Aerocom Healthcare, ... healthcare facilities. The company will provide new pneumatic tube systems or expand ...
Breaking Biology Technology: