UV-A fluorescence of sunscreens and possible energy transfer to skin components

Rajagopal Krishnan; Craig A Elmets; Thomas M. Nordlund

doi:10.1117/12.758693

8 February 2008 UV-A fluorescence of sunscreens and possible energy transfer to skin components

Rajagopal Krishnan, Craig A Elmets, Thomas M. Nordlund

Proceedings Volume 6842, Photonic Therapeutics and Diagnostics IV; 684208 (2008) https://doi.org/10.1117/12.758693
Event: SPIE BiOS, 2008, San Jose, California, United States

Abstract

Photophysical studies of UV-B sunscreens showed a measurable UV-A emission from padimate O (2-ethylhexyl-4-(dimethylamino)benzoate). Since recent studies associate UV-A to skin cancer induction pathways, as well as skin aging, we studied the effect of padimate O emission when applied to skin. After application of padimate O to skin the emission spectrum of skin showed a large increase in the intensity of 470 nm peak. The 470 nm emission in skin arises from a skin component, possibly collagen, which absorbs at about 360 nm, where padimate O emits. The excitation spectra of skin with padimate O measured at an emission wavelength of 468 nm show a peak at 310 nm with a broad shoulder at about 350 nm to 370 nm, which increased in intensity with time. However, the excitation spectrum of skin with octyl salicylate (another UV-B emitting sunscreen) did not show such a shoulder or increase in intensity. Thus, we attribute the presence of a shoulder in the excitation spectrum of skin and the increase in its intensity as evidence for energy transfer from padimate O to collagen. The transfer mechanism is not clear.

Citation Download Citation

Rajagopal Krishnan, Craig A Elmets, and Thomas M. Nordlund "UV-A fluorescence of sunscreens and possible energy transfer to skin components", Proc. SPIE 6842, Photonic Therapeutics and Diagnostics IV, 684208 (8 February 2008); https://doi.org/10.1117/12.758693

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available