Mr. Wei D. Tian Profile

Wei D. Tian

at Massachusetts General Hospital

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Proceedings Article | 22 June 1999 Paper

UV radiation at the fluorescence excitation maxima produces significant changes in the fluorescence of skin

Nikiforos Kollias, W. Tian, George Zonios, Lorenzo Brancaleon, Robert Gillies

Proceedings Volume 3590, (1999) https://doi.org/10.1117/12.350994

KEYWORDS: Luminescence, Skin, Ultraviolet radiation, Collagen, Chromophores, Monochromators, Quantum efficiency, Absorption, Proteins, Photomedicine

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Fluorescence excitation spectra of skin have been determined to be stable and reproducible. Three major bands dominate the wavelength range 280-400 nm. The major epidermal band due to tryptophan moieties appears at 295±5 nm and the major dermal bands due to collagen cross links appear at 335±5 nm and at 370±5 nm. The tryptophan fluorescence intensity has been found to increase with exposure to UV radiation; the UVB wavelengths are more effective than the UVA wavelengths. The PDCCL fluorescence intensity has been found to decrease dramatically with exposure to UVA in a wavelength specific way. The maximum of the action spectrum for this process is centered at the maximum of the excitation spectrum. The fluorescence of the skin recovers within 24 hours following exposure to UVA from single exposures. Multiple exposures produce permanent changes, in a follow-up of 8 weeks. the changes in the tryptophan fluorescence are probably due to changes in the molecular environment brought about by changes in the electrolyte balance in the epidermis following exposure. The changes in the dermis following UVA exposure appear to be associated with change in the collagen cross links, either through their association with other dermal species leading to quenching of the fluorescence or by the formation of stronger cross links with a smaller quantum efficiency. As these changes are immediate both alterations may provide the means for in vivo UV dosimetry.

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