Investigation of photoexcited states in porcine eumelanin through their transient radical products.


Journal Article

Time-resolved electron paramagnetic resonance was used to monitor the photochemistry of radical pairs from melanin in porcine retinal pigment epithelial cells on the sub-microsecond time scale. Two distinct signals were found: one of enhanced absorption/emission at early times and one mostly emissive at later times. The emissive character of the longer lived feature suggests participation of an excited triplet precursor, something not generally thought to exist in melanins. The radicals in the early time signal were separated by about 21 A and those in the later time signal were separated by about 22-24 A.

Full Text

Duke Authors

Cited Authors

  • Wang, A; Marino, AR; Gasyna, EM; Sarna, T; Norris, JR

Published Date

  • July 2009

Published In

Volume / Issue

  • 113 / 30

Start / End Page

  • 10480 - 10482

PubMed ID

  • 19572671

Pubmed Central ID

  • 19572671

Electronic International Standard Serial Number (EISSN)

  • 1520-5207

International Standard Serial Number (ISSN)

  • 1520-6106

Digital Object Identifier (DOI)

  • 10.1021/jp905417w


  • eng