Sunscreen: Photostability of Avobenzone


	Sunscreen: Photostability of Avobenzone

kmcolo

1-14-2008 3:22 PM

702 views

tags:

health, sunscreen, science

kmcolo says:

Avobenzone helps to block UV-A light, but does so as long as octinoxate is not in the sunscreen mix. Check your labels. (Other UV-A blacker, Zinc Oxide).

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/0864429b-ba3a-4941-9a27-339a23a5fc8e/56113229-65A2-4AEC-A21B-20BA88AECB3D/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WM8-4MVVPP5-TP&_user=918210&_coverDate=02%2F28%2F2007&_alid=675603338&_rdoc=1&_fmt=full&_orig=search&_qd=1&_cdi=6928&_docanchor=&view=c&_ct=4&_acct=C000047944&_version=1&_urlVersion=0&_userid=918210&md5=bc7ed4970bf543076c349e8ff95cf306" href="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WM8-4MVVPP5-TP&_user=918210&_coverDate=02%2F28%2F2007&_alid=675603338&_rdoc=1&_fmt=full&_orig=search&_qd=1&_cdi=6928&_docanchor=&view=c&_ct=4&_acct=C000047944&_version=1&_urlVersion=0&_userid=918210&md5=bc7ed4970bf543076c349e8ff95cf306" style="font-size: 11px;">www.sciencedirect.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WM8-4MVVPP5-TP&_user=918210&_coverDate=02%2F28%2F2007&_alid=675603338&_rdoc=1&_fmt=full&_orig=search&_qd=1&_cdi=6928&_docanchor=&view=c&_ct=4&_acct=C000047944&_version=1&_urlVersion=0&_userid=918210&md5=bc7ed4970bf543076c349e8ff95cf306">Exposure of skin to the UVA portion of sun's ultraviolet spectrum (320–400 nm) is strongly linked with immunesuppression and premature skin aging. Short UVA wavelengths also contribute significantly to sunburn risk. Avobenzone is the most effective UVA sunscreen active used today in sunscreen products with broad-spectrum protection.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WM8-4MVVPP5-TP&_user=918210&_coverDate=02%2F28%2F2007&_alid=675603338&_rdoc=1&_fmt=full&_orig=search&_qd=1&_cdi=6928&_docanchor=&view=c&_ct=4&_acct=C000047944&_version=1&_urlVersion=0&_userid=918210&md5=bc7ed4970bf543076c349e8ff95cf306">Results show that losses in avobenzone ranged from as high as 90% in non-photostable products to less than 10% in photostable products. The most non-photostable products contained octinoxate</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WM8-4MVVPP5-TP&_user=918210&_coverDate=02%2F28%2F2007&_alid=675603338&_rdoc=1&_fmt=full&_orig=search&_qd=1&_cdi=6928&_docanchor=&view=c&_ct=4&_acct=C000047944&_version=1&_urlVersion=0&_userid=918210&md5=bc7ed4970bf543076c349e8ff95cf306">The degradation of both octinoxate and avobenzone caused significant decreases in absorbance profiles of about 25% in the UVB and 45% in the UVA regions. In contrast, all photostable products were octinoxate-free and exhibited relatively minor changes in absorbance profiles</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/56113229-65A2-4AEC-A21B-20BA88AECB3D/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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