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Nanoparticles powerpoint Nanoparticles powerpoint Presentation Transcript

  • Are Nano Particles in Sunscreen Endangering Our Health? Presented By: Patricia Candrea and Megan Chi
  • What Are Nano Particles?
    • Named for their small size.
    • Nanometer: billionth of a meter.
    • Roughly 100,000 times smaller that the width of a human hair.
    • Assembled through rearranging the atoms.
    • Smaller than anything that is put into commercial products.
  • Where are Nano Particles?
    • Food
    • Cosmetics
    • Sunscreen
    • Clothing
    • Toys
    • And other everyday products
  • What Makes them Dangerous?
    • Big Problem: common substances behave in uncommon ways.
    • No one really knows what they do inside the body or environment.
    • Have an enormous surface to volume ratio making them biologically active.
  • Which Nano Particles Are in Sunscreen?
    • Titanium Dioxide
    • Zinc Oxide
    Titanium Dioxide Zinc Oxide
  • Why Is Titanium Dioxide Dangerous?
    • Link to Various Disorders like:
    • Autistic Disorders
    • Epilepsy
    • Alzheimer’s Disease
    • When injected into pregnant mice it caused gene changes.
  • Why Is Zinc Oxide Dangerous?
    • Can kill important brain stem cells in mice (injected with zinc oxide).
    • Toxic to colon cells even in small amounts .
  • Why Is It Dangerous to Have Nano Particles In Sunscreen?
    • Penetrate the skin leaching into the bloodstream, tissues, cells, and organs.
    • Photo Active: Produce free radicals causing DNA damage to human skin cells when exposed to UV light.
    • Can cress into human placentas from mother to unborn fetuses.
  • Why Add Nano Particles?
    • Makes the sun-blocking ingredients go on “cosmetically clear” instead of white.
  • Why Are They Safe?
    • Organic, natural occurring nanoparticles
    • Ivy nanoparticles are more uniform than the metal-based nanoparticles, and have unique material properties, which help enhance the absorption and scattering of light, and serve as a sun-blocker.
  • Ivy Nano Particle Properties
    • Easily biodegradable
    • Less toxic to mammalian cells
    • More adhesive
  • Are They Dangerous?
    • To date, the current weight of evidence suggests that titanium dioxide and zinc oxide nanoparticles do not reach viable skin cells; they remain on the surface of the skin and outer layer of the skin.
    • Nano particles of zinc and titanium do not penetrate the skin enough to pose a potential hazard
  • Are the Dangers of Sunscreen Related to Nano Particles?
    • The Biggest sunscreen safety hazards are not related to nanoparticles.
    • They are the chemicals, which are absorbed by the skin and end up the in the blood stream.
    • Stick to the sunscreens that have titanium dioxide and zinc.
    • Distribution of Nano Particles (after application on surface of skin) in the Subcutaneous tissue layer…
    • After 8 Hours…
    • After 20 Hours ..
  • Interesting Facts
    • The FDA has known for a decade that almost half the sunscreens used contain substances that accelerate the growth of skin cancer cells.
    • France, Germany, the U.K., and European Parliament have begun to require everything from safety testing and mandatory labeling of the nanoparticles.
  • Environmental Impacts
    • In a study bacteria’s cell walls were damage after adding 10 to 100 milligrams per liter of the nanosubstance.
    • According to the study the nanosubstance damaged the bacteria’s functionality.
    • Microbes uses include: removing amonia from waste water treatment plants, cleaning up toxic waste and reduce phosphorus in lakes.
  • Works Cited
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