MECHANOCHEMICAL SYNTHESIS OF SYMMETRIC ACYCLIC AZINES AND DETERMINATION OF THE UVB SOLAR PROTECTION FACTOR in vitro

Skin cancer is a frequent neoplasm in Brazil and this, is observed the importance of the development of new sunscreens using simple methodologies capable of reducing production costs. In this context, six symmetric acyclic azines were synthesized and characterized, with reaction yields between 54 and 84%, short reaction times (5 to 10 min), and manual grinding as an energy source. Sunscreens 10 %(m/m) of these compounds were produced for the in vitro determination of the solar protection factor UVB (SPF-UVB), of the the six formulations containing the synthesized azines, four showed higher photoprotective capacity in the UVB region (AZN-BZD, AZN-2OH, AZN-4OH and AZN-CIN), with SPF-UVB equivalent or higher than benzophenone-3 (BZF) and at the octylmethoxycinnamate (OMC), commercial chemical filters. The AZN-VAN and AZN-4DAB formulations presented high photoprotective capacity in the UVA region, resulting in lower SPF-UVB when compared to the other synthesized azines, but were still superior to the BZF and equivalent to the OMC. All the azines synthesized showed superior FPS-UVB to their precursor aldehydes, evidencing the increase of the photoprotective capacity due to the insertion of the azine group.