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Abstract(s)
The use of sunscreens as protective barriers against skin damage and cancer, by absorbing harmful UVA and
UVB rays, is becoming an increasingly important issue. Such products are usually based on TiO2 or ZnO,
although both Fe2O3 and hydroxyapatite (Ca10(PO4)6(OH)2, HAp) doped with metal ions have been
reported as being ultraviolet (UV) absorbing materials. HAp is the main component of bone; it is,
therefore, highly biocompatible. In the present work, an iron-doped HAp-based material, containing
both Fe ions substituted into the HAp structure and iron oxide in hematite (a-Fe2O3) form, was
successfully developed from waste cod fish bones. This was achieved through a simple process of
treating the bones in a Fe(II) containing solution, followed by heating at 700 C. The material showed
good absorption in the whole UV range and did not form radicals when irradiated. The sunscreen cream
formulated with this material could be used as a broad sunscreen protector (lcrit > 370 nm), showing
high absorption both in the UVA and UVB ranges. Because of its absorption properties it would be
classified as 5 star protection according to the Boots UVA star rating system. The cream is also
photostable, and does not cause irritation or erythema formation when in contact with the human skin.
These results show that a food by-product such as fish bones could be converted into a valuable
product, with potential applications in health care and cosmetics. This is the first time a HAp-based
sunscreen cream has been developed and validated as a proof of concept.
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Citation
PICCIRILLO,C. ...[et al.] - A hydroxyapatite–Fe2O3 based material of natural origin as an active sunscreen filter. Journal of Materials Chemistry B. ISSN 2050-750X. Vol. 2 (2014), p. 5999–6009
Publisher
Royal Society of Chemistry