Abstract
Other portion of solar spectrum apart from UV, particularly blue light, is currently reported to induce the damaging effects to human skin. This study was aimed to investigate the effect of the combination of tris-biphenyl triazine (TBPT) and inorganic metal oxides as well as the effect of the matrix formulations on UV and blue light protection efficiencies. The protection efficiency of various combinations against UVB, UVA and blue light was determined through sun protection factor (SPF), UVA protection factor (UVA-PF) and porphyrin protection factor (PPF), respectively. The results demonstrated that TBPT combined with nanosize titanium dioxide and blended iron oxides (TT60-IR) achieved the highest SPF and UVA-PF. On the other hand, TBPT combined with submicron-size titanium dioxide and blended iron oxides (TT300-IR) yielded the highest PPF value. The matrix formulation affected the scattering property of the filters (i.e. combined TBPT and inorganic metal oxides). Containing the same amount and types of the filters, the matrix formulation that possessed a high transparency property showed high scattering efficiency against the blue light.
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