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Katie Rigdon

CCMR - Ask A Scientist! - 2 views

www.ccmr.cornell.edu/...index.html

sun uvrays sunscreen

shared by Katie Rigdon on 25 Nov 12 - No Cached
  • Katie Rigdon on 25 Nov 12
     
    The radiation that comes from the sun, known as the solar spectrum, contains the visible sunlight that we see as well as invisible components of "light." The different parts of the solar spectrum have different wavelengths. Some of the solar spectrum is blocked by the earth's atmosphere, including the ozone layer that people are concerned about losing.
  • ...7 more comments...
  • Katie Rigdon on 25 Nov 12
     
    I thought this article was really interesting as it talks about how different sunscreens differ from each other based on the frequencies of light they absorb.
  • Katie Rigdon on 25 Nov 12
     
    I think I will write my next blog post on this topic so I am going to post a few more links and let me know what you guys think!
  • Jenny Mu on 26 Nov 12
     
    relating it to chemistry, it would be interesting to look at the different chemical compounds and which one help deflect which uv rays. I think this site mentions para-amino benzoic acids, zinc oxide, and titanium oxide.
  • Andrew Kang on 28 Nov 12
     
    everyone knows that there's chemistry behind sunscreen but it'd be cool to finally to see HOW the chemistry works! good idea
  • Katie Rigdon on 28 Nov 12
     
    Yeah! It's also kind of interesting because there are two different types of sunscreen: chemical and physical. I can talk about the differences there too!
  • Amanda Jara on 28 Nov 12
     
    I wonder if the sunscreens that created the thick, white 'goo' is stronger and more efficient than the transparent sunscreens used today. Most bottles of sunscreen say to reapply within a certain number of hours, so it can be interesting to see how older formulas of sunscreen compare to those most commonly used today.
  • Jenny Mu on 28 Nov 12
     
    That's a really good point, Amanda. Those thick white sunscreens that just show up on your skin opaquely probably helps to protect your skin just by blocking out the sun... Nowadays, since no one wants to have gross, whitish stuff on their face, sunblock has become clear so that you can't see it. I think they protect you from the sun by either absorbing the rays, like with oxybenzones, or reflecting the sun in tiny particles of metal oxides. Changing sunscreen to be transparent was probably for aesthetic reasons, but which way is better for sun protection? Is just straight up blocking out the sun with an opaque covering better or are these new, fancier ways better...
  • Amanda Jara on 29 Nov 12
     
    The Nanomaterials article above mentions something about using smaller particles between 20-200nanometers which make the lotions nearly clear. Because of this, I would hypothesize that it is not as effective. In addition, continuing with this topic, (despite this being from the above article) the nanoparticles seem to have a negative effect on the aquatic life and their environments.
  • Jenny Mu on 30 Nov 12
     
    hmmm interesting that you say that we could tie in environmental effects into one of our blog posts maybe? Perhaps about the chemical compounds in our personal products, and how they affect the environment? I think sunscreen is a big one, because a lot of the time, people just go into the water right after they put it on, so it can come off into the water and affect aquatic life. Good idea
Jenny Mu

Nanomaterials and Hormone Disrupters in Sunscreens | EWG's Skin Deep® | 2012 ... - 1 views

breakingnews.ewg.org/...rmone-disruptors-in-sunscreens

shared by Jenny Mu on 28 Nov 12 - No Cached
  • Jenny Mu on 28 Nov 12
     
    This site gives a really good overview of the top ingredients in sunscreens, and their pros and cons. 
  • ...2 more comments...
  • Jenny Mu on 28 Nov 12
     
    Katie - I think this would help with your blog post
  • Amanda Jara on 28 Nov 12
     
    So it seems that the biggest concerns with sunscreens and their components is that some of the components, like mineral formulations like zinc oxide and titanium dioxide, or oxybenzone, are small enough to penetrate the skin and be toxic!
  • Jenny Mu on 30 Nov 12
     
    Like you mentioned before, toxicity is something interesting we could look into. Toxicity with regard to both us as humans, and our environment, like the aquatic life that would come into contact with some of the chemicals in these sunscreens. Katie, maybe you should add this to your blog post :)
  • Katie Rigdon on 01 Dec 12
     
    I definitely will add this! Looks like some really helpful information that people should know about.
Katie Rigdon

Sunscreen - 2 views

www.sciencedaily.com/...sunscreen.htm

sunscreen skin sun

shared by Katie Rigdon on 25 Nov 12 - No Cached
  • Katie Rigdon on 25 Nov 12
     
    Sunscreen (also known as sunblock) is a lotion, spray or other topical product that helps protect the skin from the sun's ultraviolet (UV) radiation, and which reduces sunburn and other skin damage, ultimately leading to a lower risk of skin cancer.
  • Jenny Mu on 26 Nov 12
     
    This one helps further explain what I posted down there about para-amino benzoic acid, titanium oxide, and zinc oxide. It seems that para-amino benzoic acid is similar to oxybenzone, which this article says absorbs the UV rays, which is how it helps protect your skins. The metal oxides merely reflect them off. I think the mechanism by which sunscreens help protect is interesting
  • Katie Rigdon on 28 Nov 12
     
    Yay! Looks like we're making some connections between blog posts!!! I'll be sure to tie mine into yours using that information!
Jenny Mu

Beauty Antioxidants: Facial Attraction | Nutritional Outlook - 0 views

www.nutritionaloutlook.com/...ants-facial-attraction-2-10523

shared by Jenny Mu on 01 Nov 12 - No Cached
  • And while these are all products that are topically applied—a concept consumers are familiar and comfortable with—more consumers are coming around to the idea that the same ingredients that are found in lotions and potions might also be able to influence outward appearance when incorporated in the diet.
    • Jenny Mu
      Jenny Mu on 01 Nov 12
       
      Which way is better? topical treatments or oral ingestion
  • “There is human clinical evidence that these yellow carotenoids act like internal sunscreen to protect and improve skin health,” he says, referring to a 2007 study that tested the oral and topical effects of lutein and zeaxanthin over 12 weeks. (P Palombo et al., “Beneficial long-term effects of combined oral/topical antioxidant treatment with the carotenoids lutein and zeaxanthin on human skin: a double-blind, placebo-controlled study,” Skin Pharmacology and Physiology, vol. 20, no. 4 (2007):199-210.) “Statistically significant, favorable effects were seen on three skin function outcomes, including hydration, photoprotection, and lipid damage,” says Bhattacharya. “Higher oral doses of zeaxanthin were shown to provide effective protection against sunburn, which could help reduce the risks of skin cancer, premature aging, and wrinkling.”
  • ...3 more annotations...
    • Jenny Mu
      Jenny Mu on 01 Nov 12
       
      What inside them is acting like an internal sunscreen? Chemically, how does it work?
  • Pycnogenol is one of the few antioxidants shown to effectively neutralize all oxygen radical species. It says this is especially important to the skin, as even low-to-moderate UV exposure generates oxygen radicals in the dermis.
    • Jenny Mu
      Jenny Mu on 01 Nov 12
       
      Neutralization of oxygen radical species. Once again, we should look into the chemical process of how this happens. The transfer of electrons etc.
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