Abstract:
:We present an in vivo study of the optical properties of melanin present in melanocytic nevi of human subjects with Fitzpatrick skin type III (Caucasian descent) using optical spectroscopy. We show that the melanin absorption spectrum exhibits an exponential dependence on wavelength with a decay constant which follows a normal distribution characteristic of a random biological variable. Moreover, we demonstrate lack of correlation among melanin optical properties, melanin concentration and skin light scattering properties, which indicates that the true optical absorption of melanin can be measured free from confounding scattering effects. We also show that the average melanin absorption spectrum in vivo is in very good agreement with a previously reported oxygen photoconsumption action spectrum of melanin. Finally, we provide an overview of the emerging picture of the melanin absorption properties in vivo among various skin types and also among various skin lesions such as melanocytic nevi and melanoma.
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Zonios G,Dimou Adoi
10.1111/j.1751-1097.2008.00436.xsubject
Has Abstractpub_date
2009-01-01 00:00:00pages
298-303issue
1eissn
0031-8655issn
1751-1097pii
PHP436journal_volume
85pub_type
杂志文章abstract::The temperature dependence of the uptake phase of 5-aminolevulinic acid (ALA) and the following production phase of protoporphyrin IX (PpIX) in normal mouse skin was investigated. A cream containing 20% ALA was topically applied on the skin for 10 min. The amount of ALA-induced PpIX was evaluated by measuring the fluo...
journal_title:Photochemistry and photobiology
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
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journal_title:Photochemistry and photobiology
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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