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Usage of Titanium Dioxide with Avobenzone for Sunscreen
I have read some articles in that they have mentioned that Titanium Dioxide reduce the stability of Avobenzone in Sunscreen formulation.
& Avobenzone degrade fast in light combination with Minerals (Titanium Dioxide) so it is true ?
I want to know that we can use Titanium Dioxide & Avobenzone combine in the sunscreen formula ? if no than why ?
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4 Replies
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vjay, if you can cite the source of the article you mention, that would be helpful. I have never heard or read of any mineral interactions with avobenzone; especially with a relatively inert one like TiO2. In any event, you may want to avail one of those singlet-state quenchers (esters) supplied by HallStar since sunlight itself degrades avobenzone somewhat rapidly - that much is definitely known!
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Like most most cosmetic chemistry generalisations the answer is of course yes, no, maybe.
There used to be TVC here for Castrol motor oils which went along the lines of “Oils aint oils..” Well Titanium Dioxide aint titanium dioxide. Certainly untreated TiO2 grades appear to accelerate the photodegradation of Avobenzone (Butyl Methoxydibezoylmethane). But the surface treated grades & using other formulation tricks probably could minimise this.
http://www.koboproductsinc.com/downloads/nyscc-avobenzone.pdf
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L’oréal and Fujifilm, some of the best cosmetic companies of the world, sell a lot of sunscreens with AVO + TiO2 (coated). So I guess that’s ok.
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@pma - an excellent point!
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