Visible, not only UV, light may also damage your hair and skin

by Mauricio Baptista

On the recent years, we aimed to understand the effects of visible light on skin and hair. We showed that melanin is able to photosensitize the generation of singlet oxygen both in the UVA (355nm) and in the visible (532nm) with similar yields and that the photosensitization of melanin forming singlet oxygen is the main cause of damage in hairs under exposition to visible light [1]. These results also suggest the possible role of visible light in damaging human skin, similarly to the well accepted effect of UVA light. In order to understand the effects

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Photochemistry in the dark governs pathways for singlet oxygen generation

Excited species such as singlet molecular oxygen [O2(1Δg)] and triplet carbonyls are a less understood subgroup of oxygen-derived oxidants in BioMedicine. Their generation has been associated to the detection of ultraweak chemiluminescence in mammalian tissues and there is emerging evidence for their roles in pathophysiological situations. However, pathways accounting for their generation in vivo have remained obscure, limiting the assessment of their biological roles. In vitro, excited species arise from photochemical processes involving direct excitation by light. However, atypical photochemical processes not involving photoexcitation have been proposed

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