PORTO, Portugal - A team of researchers at Portuguese Catholic University in Porto has developed an effective new sunscreen derived from recycled cod fish bones.
Portugal scientists have made the new sunscreen by treating cod bones with FeCl2solution for three hours at 65-70 øC, Press TV reported.
"They then dried the bones overnight and calcined at 700 øC for one hour, yielding multiphasic materials containing HAp, iron-substituted HAp and a small amount of hematite that absorbs UV radiation," explained Clara Piccirillo from the Portuguese Catholic University.
"Iron oxide was already reported as a UV absorber; in our material, the presence of calcium iron hydrogen phosphate (Ca9FeH(PO4)7) increases the absorption and extends it over the whole UV range," Piccirillo also noted.
In next step the prepared materials were made into creams. Various tests revealed the good photostability and a UVA-to-UVB ratio even greater than 0.90, which means that the production has proved to be a comparable protection against both UVA and UVB radiation.
The naturally derived sunscreen was tested on 20 human volunteers who had a small quantity of the cream applied to an area of their skin for 48 hours and showed no adverse allergic reaction.