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2013, Number 3

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Gac Med Mex 2013; 149 (3)

In vitro assessment of UVA protection by sunscreens for prescription in Mexico

Castanedo CJP, Torres ÁB, Valdés GG, Ehnis PA

Language: Spanish
References: 22
Page: 292-298
PDF size: 91.70 Kb.


ABSTRACT

An appropriate sunscreen should provide a high and broad ultraviolet (UV) protection for both UVB (290-329 nm) and UVA (329-400 nm) segments. Objective: to quantify the UVA protection in vitro of 68 sunscreens available for medical prescription in Mexico. Methods: UV absorbance was quantified through two simple and easy to interpret methods: the critical length of absorption (Cλ), and spectral uniformity index (SUI). Results: based on the Cλ, 97% of the products absorbed 90% or more of the radiation between 290-370 nm. The SUI showed that 41% (n = 28) offer high protection, and 35% very high (n = 34). We did not find an association between the sun protecting factor (SPF) and Cλ. Conclusion: in contrast to previous sunscreens, recent ones show a noticeable improvement in UVA absorption. Because SPF refers to only UVB protection, the prescription of these products should not be established only by this value, but by its capacity to have broad UV coverage. The most common active ingredients found in the sunscreens with better UVA protection were titanium dioxide, avobenzone, bemotrizinol and bisoctrizole.


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