Australians risking skin cancer to avoid nanoparticles

Feb 09, 2012

More than three in five Australians are concerned enough about the health implications of nanoparticles in sunscreens to want to know more about their impact. And while the initial scientific information released suggests little cause for alarm, it does justify the community’s confusion.

That’s the message that emerges from a survey and three research papers on nanoparticles in sunscreens presented at the 2012 International Conference on Nanoscience and Nanotechnology (ICONN) in Perth this week.

Researchers reported that:

• some sunscreens that claim to be nano-free do in fact contain nanostructured material – highlighting the need for clear nano definitions;

• claims of the dangers of nano metal oxides in sunscreen might be overstated; and

• a very small amount of zinc from zinc in sunscreens is absorbed through human skin

The Cancer Council of Australia reports that we have one of the highest rates of in the world, with over 440,000 people receiving medical treatment for skin cancers each year, and over 1,700 people dying of all types of skin cancer annually.

The survey of public attitudes towards sunscreens with nanoparticles, commissioned by the Australian Department of Industry, Innovation, Science, Research and Tertiary Education and conducted last month, showed that about 17% of people in Australia were so worried about the issue, they would rather risk skin cancer by going without sunscreen than use a product containing nanoparticles.

Scientists from Australia’s National Measurement Institute and overseas collaborators reported on a technique using the scattering of synchrotron light to determine the sizes of particles in sunscreens. They found that some commercial sunscreens that claim to be ‘nano-free’ do in fact contain nanostructured material. The findings highlight the need for clear definitions when describing nanomaterials.

Researchers from RMIT and Nanosafe Australia reported on studies using human cells that show zinc oxide and titanium oxide particles used in sunscreens are as well-tolerated as zinc ions and conventional chemical sunscreens in human cell test systems.

A joint CSIRO and Macquarie University study found that a very small amount of zinc from zinc oxide particles in sunscreens is absorbed through human skin under normal conditions of sunscreen use but that it is a very small fraction of the levels of zinc normally found in blood. It is not known if the absorbed zinc is in the form of soluble zinc ions or zinc oxide particles.

When zinc oxide and titanium dioxide in sunscreens are reduced to the nanoscale they make the sunscreen transparent. The Australian Therapeutic Goods Administration has released a statement on safety of containing nanoparticles that concluded: “… the current weight of evidence suggests that TiO2 (titanium dioxide) and ZnO () do not reach viable skin cells, rather, they remain on the surface of the skin and in the outer layer of the skin…”

Explore further: Research reveals how our bodies keep unwelcome visitors out of cell nuclei

More information: More at www.tga.gov.au/pdf/review-sunscreens-060220.pdf
The full survey data is available at: www.innovation.gov.au/nets-pace-research
For more information on nanoparticles and sunscreens: cancer.org.au/cancersmartlifes… ticles_sunscreen.htm

add to favorites email to friend print save as pdf

Related Stories

Consumers' close encounters with nanoparticles

Aug 10, 2011

The most personal encounter that many consumers have had so far with the much-heralded field of nanotechnology is the topic of an article in the current edition of Chemical & Engineering News (C&EN), the American Chemical Societ ...

Jury still out on sunscreen nanoparticles: study

Aug 20, 2010

(PhysOrg.com) -- A technique developed by Macquarie University has proven for the first time that a tiny amount of zinc from sunscreens is absorbed through the skin into the human body, but is not yet able ...

Scientist Creates Sunscreen from Ivy

Aug 03, 2010

Drive through the University of Tennessee in Knoxville on a sunny day, and you may see a man on the side of the road pruning the English ivy.

Recommended for you

Study shows graphene able to withstand a speeding bullet

14 hours ago

(Phys.org)—A team of researchers working at Rice University in the U.S. has demonstrated that graphene is better able to withstand the impact of a bullet than either steel or Kevlar. In their paper published ...

Nanomaterials to preserve ancient works of art

Nov 27, 2014

Little would we know about history if it weren't for books and works of art. But as time goes by, conserving this evidence of the past is becoming more and more of a struggle. Could this all change thanks ...

Learning anti-microbial physics from cicada

Nov 27, 2014

(Phys.org) —Inspired by the wing structure of a small fly, an NPL-led research team developed nano-patterned surfaces that resist bacterial adhesion while supporting the growth of human cells.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.