{"id":29404,"date":"2011-08-16T12:40:08","date_gmt":"2011-08-16T05:40:08","guid":{"rendered":"https:\/\/nano2.toolsmkt.com\/?p=2968"},"modified":"2011-08-16T12:40:08","modified_gmt":"2011-08-16T05:40:08","slug":"scrutinizing-sunscreens","status":"publish","type":"post","link":"https:\/\/www.nanotec.or.th\/en\/scrutinizing-sunscreens\/","title":{"rendered":"Scrutinizing Sunscreens"},"content":{"rendered":"<p>More and more manufacturers have reduced particle sizes in their sunscreens to the nanoscale \u2013 causing the particles to be more transparent \u2013 and avoiding the white, pasty appearance of sunscreens that use large particles. <!--more-->Francis Quinn, director for sustainable development at personal care firm L\u2019Or\u00e9al, said, \u201cConsumers are willing to apply a product that you can barely see\u201d and \u201care more likely to apply it several times per day\u201d to reduce the risk of skin cancer. Yet nanotechnology brings questions about whether the tiny particles interact with living cells and the environment in a harmful way. There is concern about the potential for nanoscale zinc oxide and titanium dioxide to pass through the outer layer of skin, and eventually to the bloodstream. There is also concern that titanium dioxide nanoparticles act as photocatalysts and generate skin-damaging free radicals. While researchers are intensely studying the issue, and most companies have put safeguards in place for their products, there has been an uproar over nanoparticles in sunscreens. Studies have found differing levels of penetration of nanoparticles into the skin or blood, but most concur that the amounts are tiny. Other studies have found that nanoparticles tend to aggregate when applied. Andrew Maynard, director of the Risk Science Center at the University of Michigan, United States, said that in sunscreens, even though \u201cthe individual particles are very small, the clumps of stuff on your skin are not going to be that, so there\u2019s even less chance of them getting where you don\u2019t want them to be.\u201d Other studies, however, found that titanium dioxide nanoparticles in sunscreen killed two to three times as many viable skin cells as UV light alone. Despite concerns about the safety of nanoparticle-based sunscreens, researchers usually caution that sunscreen should be worn to protect against skin cancer \u2013 the leading type of cancer in the U.S. As Maynard says, extended exposure to sunlight without sunscreen will always be a risk, and the best balance between risk and benefit is the continued use of sunscreen for protection.<\/p>\n<p><a href=\"http:\/\/pubs.acs.org\/cen\/science\/89\/8932sci2.html?featured=1\">http:\/\/pubs.acs.org\/cen\/science\/89\/8932sci2.html?featured=1<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>More and more manufacturers have reduced particle sizes in their sunscreens to the nanoscale \u2013 causing the particles to be [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[34],"tags":[],"class_list":["post-29404","post","type-post","status-publish","format-standard","hentry","category-technology-update"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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