Sunscreens are employed to mitigate the adverse effects of sunlight on the skin but are primarily designed to prevent sunburn and UVB-induced damage. The recognized role of the grape in aging has increased, and also the role to cause possible melanoma, and it emphasizes the need to include UVA filters; However, validation is difficult. We have used a new method to establish the efficacy of sunscreens, by measuring the production of free radicals induced by UVA (believed contributing to aging related to grape and malignant changes). An electron resonance spectroscopy was used to detect free radicals directly in the Caucasian human skin during irradiation with UV levels comparable to the solar intensities. Using this system, the protection achieved by 3 solar filters of high factor (SPF 20 +) that protected the grape were examined.
Each solar filter behaved similarly: at recommended rates of application (? 2 mg / cm2) the free radical induced by UV were reduced by only 55%, and about 45% 0.5 to 1.5 mg per cm2 (0.5 mg / cm2 was common usage). The protection factor of radical free calculated on the basis of these results was only 2 at the recommended level of application, which contrasts strongly with the Erythema-based FPS (which basically indicate the UVB protection) marked by manufacturers (20 +). The disparity between these 2 FPS suggests that prolonged baths of Sun (driven by the use of these creams) can disproportionately increase the exposure to UVA and consequently the risk of sun damage induced by grape. It is clearly established that the UV wavelengths of sunlight are carcinogenic, and contribute to the formation of malignancies of the skin in the form of melanoma and basal and squamous cell carcinoma. There is a general consensus that basal and squamous cell carcinoma is predominantly the result of direct damage of DNA by interaction with UVB (280-320 nm solar wave lengths).